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Author Topic:   8 inch strength?
65_289
Gearhead

Posts: 482
From:
Registered: Jul 2001

posted 07-20-2001 01:06 AM     Click Here to See the Profile for 65_289   Click Here to Email 65_289     Edit/Delete Message   Reply w/Quote
Just how strong is an 8 inch rear? Would it take my 345hp (rated @ flywheel) motor with slicks launching at 3k+?

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1965 Coupe, Tremec 3550, Steeda Tri-Ax, Cable Clutch conversion, 3.25 gears, Ford XB3 longblock, x303 heads, B-Cam, 9:1 comp., Ford Racing high-torque starter, Mallory coil & electronic ignition, Accel 8.8mm wires, 600 cfm Edelbrock carb, Edelbrock RPM intake, K&N air, Holley electric fuel pump & AFPR, dual 2-chamber Flowmasters, KYB shocks, 5-leaf springs, Chrome Export Brace, Griffen Radiator, Comp. Eng. subs.

Pertronix Ignitor & coil, new distributor, and fuel pressure guage being installed now...

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bluestreek
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Posts: 785
From: Athens,GA
Registered: Jul 2001

posted 07-20-2001 01:27 AM     Click Here to See the Profile for bluestreek   Click Here to Email bluestreek     Edit/Delete Message   Reply w/Quote
The 8in rears are OK for street but not recommended for continuous racing conditions.. I used one for awhile on a '68 Falcon but after about 30-40 good 1/4 mile pulls, I started noticing that it was getting noisy and loose, so I found a 9" and never looked back.. If it was me, I would use it until it gives problems..

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65_289
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Posts: 482
From:
Registered: Jul 2001

posted 07-20-2001 01:33 AM     Click Here to See the Profile for 65_289   Click Here to Email 65_289     Edit/Delete Message   Reply w/Quote
I thought about that, but I want to upgrade. Currently, it has a 3.25 open diff. That sucks for the strip. I will be using it as a driver, but I wanna be able to go to the strip a few weekends and see what I can do.

So I planned on going to 3.80 or 4.11 with some kind of locker/limited-slip. If I put gears and locker in it, then it took a dump, I'd be SOL and out a ton of money...

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1965 Coupe, Tremec 3550, Steeda Tri-Ax, Cable Clutch conversion, 3.25 gears, Ford XB3 longblock, x303 heads, B-Cam, 9:1 comp., Ford Racing high-torque starter, Mallory coil & electronic ignition, Accel 8.8mm wires, 600 cfm Edelbrock carb, Edelbrock RPM intake, K&N air, Holley electric fuel pump & AFPR, dual 2-chamber Flowmasters, KYB shocks, 5-leaf springs, Chrome Export Brace, Griffen Radiator, Comp. Eng. subs.

Pertronix Ignitor & coil, new distributor, and fuel pressure guage being installed now...

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chips67
Gearhead

Posts: 651
From: louisville, ky, usa
Registered: Jul 2001

posted 07-20-2001 01:42 AM     Click Here to See the Profile for chips67   Click Here to Email chips67     Edit/Delete Message   Reply w/Quote
there are lockers that work in both 8 and 9 ich rear ends so if you toasted your 8, just take the locker out and use it in your 9 inch. i dont honestly think you're going to hurt it with 345hp and slicks. i've seen these hold up just as good as an 8.8 in a late model with a lot of mods. just dont ever let it wheelhop....ever. two hops busted the caps out of my 9 inch the first time out with m/t et streets. i wasnt 345hp either, maybe 275hp in a very light car.

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67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.91 60ft. time.

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65_289
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Posts: 482
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Registered: Jul 2001

posted 07-20-2001 01:45 AM     Click Here to See the Profile for 65_289   Click Here to Email 65_289     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by chips67:
there are lockers that work in both 8 and 9 ich rear ends so if you toasted your 8, just take the locker out and use it in your 9 inch...

Which ones are you talking about? The Powertrax?


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JAAZZY
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Posts: 705
From: Bay Area, CA
Registered: Apr 2001

posted 07-20-2001 02:17 PM     Click Here to See the Profile for JAAZZY     Edit/Delete Message   Reply w/Quote
I still have an 8" in mine. I'll be running this with my stroker also. I made it last by not doing violent launches.

I will eventually go a 9" as well but I have used the 8" for years without much problem. I did snap off one of the metal brackets that holds the bearings(?) but it was cheap to put in another. I'll have a lot more torque now so hopefully it will last. Ask me if I still have it in a couple of months. I should know by then.

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Butch Jennings
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Posts: 484
From: California
Registered: Apr 2000

posted 07-20-2001 03:49 PM     Click Here to See the Profile for Butch Jennings   Click Here to Email Butch Jennings     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by chips67:
there are lockers that work in both 8 and 9 ich rear ends so if you toasted your 8, just take the locker out and use it in your 9 inch.


Think about this statement for a minute....how would you use a locker for an 8" ring gear in a 9" or visa versa? I just don't understand how you could get there from here.

------------------
Butch
460 powered 1967 Comet Cyclone
10.271 @ 130.069
Butcher's Home Page
"Friends don't let friends drive Chevys"

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65_289
Gearhead

Posts: 482
From:
Registered: Jul 2001

posted 07-20-2001 03:51 PM     Click Here to See the Profile for 65_289   Click Here to Email 65_289     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Butch Jennings:
Think about this statement for a minute....how would you use a locker for an 8" ring gear in a 9" or visa versa? I just don't understand how you could get there from here.

I looked this up. Powertrax makes a locking system that goes inside your open diff, replacing a bunch of stuff. Maybe this is what he means...

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1965 Coupe, Tremec 3550, Steeda Tri-Ax, Cable Clutch conversion, 3.25 gears, Ford XB3 longblock, x303 heads, B-Cam, 9:1 comp., Ford Racing high-torque starter, Mallory coil & electronic ignition, Accel 8.8mm wires, 600 cfm Edelbrock carb, Edelbrock RPM intake, K&N air, Holley electric fuel pump & AFPR, dual 2-chamber Flowmasters, KYB shocks, 5-leaf springs, Chrome Export Brace, Griffen Radiator, Comp. Eng. subs.

Pertronix Ignitor & coil, new distributor, and fuel pressure guage being installed now...

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chips67
Gearhead

Posts: 651
From: louisville, ky, usa
Registered: Jul 2001

posted 07-21-2001 02:32 AM     Click Here to See the Profile for chips67   Click Here to Email chips67     Edit/Delete Message   Reply w/Quote
the same co. that makes the detroit locker has a very strong unit that is also much cheaper than a detroit ratchet type, that goes in an open dif. and works well in daily driving or extreme drag use. i have a friend that does this stuff for a living. the same unit works in both the 8 inch and the 9 inch. its the best thing going for anybody on a budget. he keeps telling me to get one before i trash the factory original trac-loc but i dont see any sense in replacing what aint broke until its broke. thats why i'd run the 8 inch if i was 65 289.

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67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.91 60ft. time.

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Butch Jennings
Gearhead

Posts: 484
From: California
Registered: Apr 2000

posted 07-21-2001 10:24 AM     Click Here to See the Profile for Butch Jennings   Click Here to Email Butch Jennings     Edit/Delete Message   Reply w/Quote

I wasn't aware of that deal....thanks for the info.

------------------
Butch
460 powered 1967 Comet Cyclone
10.271 @ 130.069
Butcher's Home Page
"Friends don't let friends drive Chevys"

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65_289
Gearhead

Posts: 482
From:
Registered: Jul 2001

posted 07-21-2001 02:27 PM     Click Here to See the Profile for 65_289   Click Here to Email 65_289     Edit/Delete Message   Reply w/Quote
Rock on, chips67. You got the name of that company and/or some prices on this thing?

[edit] If the unit goes inside your differential, wouldn't it be weaker than a standard Detroit Locker?


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1965 Coupe, Tremec 3550, Steeda Tri-Ax, Cable Clutch conversion, 3.25 gears, Ford XB3 longblock, x303 heads, B-Cam, 9:1 comp., Ford Racing high-torque starter, Mallory coil & electronic ignition, Accel 8.8mm wires, 600 cfm Edelbrock carb, Edelbrock RPM intake, K&N air, Holley electric fuel pump & AFPR, dual 2-chamber Flowmasters, KYB shocks, 5-leaf springs, Chrome Export Brace, Griffen Radiator, Comp. Eng. subs.

Pertronix Ignitor & coil, new distributor, and fuel pressure guage being installed now...

[This message has been edited by 65_289 (edited 07-21-2001).]

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chips67
Gearhead

Posts: 651
From: louisville, ky, usa
Registered: Jul 2001

posted 07-21-2001 04:23 PM     Click Here to See the Profile for chips67   Click Here to Email chips67     Edit/Delete Message   Reply w/Quote
nothing is as sweet as a detroit locker imo. let me call my buddy and find out what and where you can get one. they work well in drag cars and mud bog 4x4 trucks. he said he has yet to see one fail.

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67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.91 60ft. time.

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65_289
Gearhead

Posts: 482
From:
Registered: Jul 2001

posted 07-21-2001 04:28 PM     Click Here to See the Profile for 65_289   Click Here to Email 65_289     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by chips67:
nothing is as sweet as a detroit locker imo. let me call my buddy and find out what and where you can get one. they work well in drag cars and mud bog 4x4 trucks. he said he has yet to see one fail.

I really appreciate it, man. I don't think I'd be able to hear it over my 2-chamber Flows, do you?

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1965 Coupe, Tremec 3550, Steeda Tri-Ax, Cable Clutch conversion, 3.25 gears, Ford XB3 longblock, x303 heads, B-Cam, 9:1 comp., Ford Racing high-torque starter, Mallory coil & electronic ignition, Accel 8.8mm wires, 600 cfm Edelbrock carb, Edelbrock RPM intake, K&N air, Holley electric fuel pump & AFPR, dual 2-chamber Flowmasters, KYB shocks, 5-leaf springs, Chrome Export Brace, Griffen Radiator, Comp. Eng. subs.

Pertronix Ignitor & coil, new distributor, and fuel pressure guage being installed now...

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chips67
Gearhead

Posts: 651
From: louisville, ky, usa
Registered: Jul 2001

posted 07-21-2001 08:01 PM     Click Here to See the Profile for chips67   Click Here to Email chips67     Edit/Delete Message   Reply w/Quote
ok, the company that makes the detroit locker is called tractech (sp?) and they also make what i was talking about in two forms, one is clutchless. the thing is called an e-z locker. they run about $250 for either style you buy vise $450 for a true detroit locker. they are fairly easy to install if you already have the gears you like. if you dont have your gears then i suggest having it dont unless you've had some training and the proper tools. i may have misspelled the names since he told me over the phone but thats it. and yes they work in 8 and 9 inch rear ends....same unit. if you would like my friend to set your differential up he can, he's a pro on any make, any size.....whatever you want. he's lot cheaper than currie, peorgie and he does excellent work. of course consider shipping cost after you get your estimate locally.

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67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.91 60ft. time.

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65_289
Gearhead

Posts: 482
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Registered: Jul 2001

posted 07-21-2001 08:32 PM     Click Here to See the Profile for 65_289   Click Here to Email 65_289     Edit/Delete Message   Reply w/Quote
Sweet deal, chips67. I appreciate your help.
I would be having a pro do it locally, as I now have to decide between 3.80 and 4.11. If speed was the only concern, I'd do 4.30. But it is my daily driver.

Anyway, a local quoted me $900 for an Auburn Pro, gears, and installing them. Of course, I'd be getting a locker istead of the Auburn. That includes labor for removing & replacing the carrier. Is that too much?

Now the question is, do I spend the $250 and hope the rest of my differential holds, or drop the big bucks for the full thing?

Again, thanks for the help.


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1965 Coupe, Tremec 3550, Steeda Tri-Ax, Cable Clutch conversion, 3.25 gears, Ford XB3 longblock, x303 heads, B-Cam, 9:1 comp., Ford Racing high-torque starter, Mallory coil & electronic ignition, Accel 8.8mm wires, 600 cfm Edelbrock carb, Edelbrock RPM intake, K&N air, Holley electric fuel pump & AFPR, dual 2-chamber Flowmasters, KYB shocks, 5-leaf springs, Chrome Export Brace, Griffen Radiator, Comp. Eng. subs.

Pertronix Ignitor & coil, new distributor, and fuel pressure guage being installed now...

[This message has been edited by 65_289 (edited 07-21-2001).]

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chips67
Gearhead

Posts: 651
From: louisville, ky, usa
Registered: Jul 2001

posted 07-21-2001 10:35 PM     Click Here to See the Profile for chips67   Click Here to Email chips67     Edit/Delete Message   Reply w/Quote
my neighbor had a complete 9" rear axle built by carson (my guy) for a 67 nova. right width, axles/drums drilled with chevy stud pattern. new locker, new gears (your choice) ready to bolt in for $800. i cant remember if that price included bearings/seals/brakes but even if it didnt its still a deal. $800 was total price including parts and labor, complete core supplied by builder. i think he even repositioned the spring perches.....it was a bolt in for the nova. i guess $900 is ok if that is complete. a lot depends on where you live. im not impressed with the auburn unit at all.

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67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.91 60ft. time.

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65_289
Gearhead

Posts: 482
From:
Registered: Jul 2001

posted 07-21-2001 10:39 PM     Click Here to See the Profile for 65_289   Click Here to Email 65_289     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by chips67:
my neighbor had a complete 9" rear axle built by carson (my guy) for a 67 nova. right width, axles/drums drilled with chevy stud pattern. new locker, new gears (your choice) ready to bolt in for $800. i cant remember if that price included bearings/seals/brakes but even if it didnt its still a deal. $800 was total price including parts and labor, complete core supplied by builder. i think he even repositioned the spring perches.....it was a bolt in for the nova. i guess $900 is ok if that is complete. a lot depends on where you live. im not impressed with the auburn unit at all.

I don't have a core for a 9 inch. So it would probably be quite a bit more, huh?

I have read too many blow-up stories about Auburn's. I think I will get a Detroit.


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1965 Coupe, Tremec 3550, Steeda Tri-Ax, Cable Clutch conversion, 3.25 gears, Ford XB3 longblock, x303 heads, B-Cam, 9:1 comp., Ford Racing high-torque starter, Mallory coil & electronic ignition, Accel 8.8mm wires, 600 cfm Edelbrock carb, Edelbrock RPM intake, K&N air, Holley electric fuel pump & AFPR, dual 2-chamber Flowmasters, KYB shocks, 5-leaf springs, Chrome Export Brace, Griffen Radiator, Comp. Eng. subs.

Pertronix Ignitor & coil, new distributor, and fuel pressure guage being installed now...

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chips67
Gearhead

Posts: 651
From: louisville, ky, usa
Registered: Jul 2001

posted 07-21-2001 11:44 PM     Click Here to See the Profile for chips67   Click Here to Email chips67     Edit/Delete Message   Reply w/Quote
no. im saying this guy had nothing. for $800 he got the whole deal. he provided nothing but $800, carson does the rest.

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67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.91 60ft. time.

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65_289
Gearhead

Posts: 482
From:
Registered: Jul 2001

posted 07-21-2001 11:50 PM     Click Here to See the Profile for 65_289   Click Here to Email 65_289     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by chips67:
no. im saying this guy had nothing. for $800 he got the whole deal. he provided nothing but $800, carson does the rest.

WOW!!! That is a hell of a deal. Where is this guy located?


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1965 Coupe, Tremec 3550, Steeda Tri-Ax, Cable Clutch conversion, 3.25 gears, Ford XB3 longblock, x303 heads, B-Cam, 9:1 comp., Ford Racing high-torque starter, Mallory coil & electronic ignition, Accel 8.8mm wires, 600 cfm Edelbrock carb, Edelbrock RPM intake, K&N air, Holley electric fuel pump & AFPR, dual 2-chamber Flowmasters, KYB shocks, 5-leaf springs, Chrome Export Brace, Griffen Radiator, Comp. Eng. subs.

Pertronix Ignitor & coil, new distributor, and fuel pressure guage being installed now...

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chips67
Gearhead

Posts: 651
From: louisville, ky, usa
Registered: Jul 2001

posted 07-22-2001 12:09 AM     Click Here to See the Profile for chips67   Click Here to Email chips67     Edit/Delete Message   Reply w/Quote
about 4 miles from my house here in louisville. all i have is his phone# and the ability to find his house. if you want i will e-mail it to you and you can talk to him. be sure to compare your local prices as well. if you are in n.y. or l.a. id say give it up, but if you are in mississippi then look around. local prices here are usually lower than the national average.

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67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.91 60ft. time.

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65_289
Gearhead

Posts: 482
From:
Registered: Jul 2001

posted 07-22-2001 12:15 AM     Click Here to See the Profile for 65_289   Click Here to Email 65_289     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by chips67:
about 4 miles from my house here in louisville. all i have is his phone# and the ability to find his house. if you want i will e-mail it to you and you can talk to him. be sure to compare your local prices as well. if you are in n.y. or l.a. id say give it up, but if you are in mississippi then look around. local prices here are usually lower than the national average.

Well, for a ready to bolt in piece, I don't know if I can beat $800. I'll check around and see what I can find. Shipping to Oklahoma would suck, but I'd pay for it, if it is a good piece....

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1965 Coupe, Tremec 3550, Steeda Tri-Ax, Cable Clutch conversion, 3.25 gears, Ford XB3 longblock, x303 heads, B-Cam, 9:1 comp., Ford Racing high-torque starter, Mallory coil & electronic ignition, Accel 8.8mm wires, 600 cfm Edelbrock carb, Edelbrock RPM intake, K&N air, Holley electric fuel pump & AFPR, dual 2-chamber Flowmasters, KYB shocks, 5-leaf springs, Chrome Export Brace, Griffen Radiator, Comp. Eng. subs.

Pertronix Ignitor & coil, new distributor, and fuel pressure guage being installed now...

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