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Author Topic:   Rear end explanation
HHuggins
Gearhead

Posts: 122
From: Laguna Niguel, CA
Registered: Feb 2001

posted 04-25-2001 03:32 AM     Click Here to See the Profile for HHuggins   Click Here to Email HHuggins     Edit/Delete Message   Reply w/Quote
I think I've got all of this figured out, but just for the record, could one of the experts explain the differences/advantages of the different rear end options? Splines, bolts, open, detroit, posi, mini-spool, nodular?

As always - thanks!

Harley

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_ _____________________ _

Harley D. Huggins II
Laguna Niguel, CA

1970 Mach I
1998 GT Convertible
www.geocities.com/hh_machi/

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steve'66
Gearhead

Posts: 5272
From: Sonoma,CA,USA
Registered: Mar 2000

posted 04-25-2001 10:41 AM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Here's a "stab" at it,

Splines - 28 std car, 31 p/u truck, The more splines the stronger the axle. More splines available on aftermarket axles/differentials.

Nodular - Strongest "stock" case.

Open - The loosest differential, a "one legger", this differential applies power to the tire with the least resistance. If both tires have the same traction it will divide the power equally. Uses spider gears.

Posi - Actually Trac-Loc is Ford's name for the clutch pack type differential. The clutches attempt to keep both rear axles turning the same speed.

Detroit Locker - An automatic locker using a pair of steel ratcheting hubs. During acceleration or deceleration the hubs are forced together "locking" the two axles together. When coasting they click while allowing the axles to turn different speeds.

Mini spool - The weakest spool, a spool locks the two axles at all times. Good for strip only cars, a full spool is strongest.

SteveW

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Thud
Gearhead

Posts: 1002
From: Cumming,Ga.,USofA
Registered: Jun 99

posted 04-25-2001 10:47 AM     Click Here to See the Profile for Thud     Edit/Delete Message   Reply w/Quote
There also was a 31-spline car unit for Hi-Perf applications.

The "bolts" question applies to generic motors rears. There's lots of stuff with that, but if you stay pure (Ford-only) it don't matter.

------------------
"It only takes money"

Dwayne

M&M Member #18
'94 Lightning #942 of 4007
'70 Mach1
'69 Cyclone Spoiler II
'65 Galaxie 500 + parts car

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steve'66
Gearhead

Posts: 5272
From: Sonoma,CA,USA
Registered: Mar 2000

posted 04-25-2001 11:14 AM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Good point Dwayne.

I didn't know what Harley meant by bolts? Use good ones...

Any other questions? Like axle bearing sizes? What are you building Harley?

SteveW

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n2oMike
Gearhead

Posts: 1252
From: Spencer, WV
Registered: Jan 2001

posted 04-25-2001 11:40 AM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
4WD Trucks used 31 spline axles, the 2WD F100's used 28. 31 spline axles came in more trucks than cars, but not -all- trucks had 31 spline axles.

Good Luck!

------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/motorcitymustang/cmml/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367

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Thud
Gearhead

Posts: 1002
From: Cumming,Ga.,USofA
Registered: Jun 99

posted 04-25-2001 12:43 PM     Click Here to See the Profile for Thud     Edit/Delete Message   Reply w/Quote
OOPS, I guess I made a pretty big assumption that Harley was asking a "10-bolt/12-bolt" kind of question... I appologize, Harley, if I was heading in the wrong direction.

I second Steve's statement. Use the best fasteners available. The cheap stuff can get awful expensive when it fails.

------------------
"It only takes money"

Dwayne

M&M Member #18
'94 Lightning #942 of 4007
'70 Mach1
'69 Cyclone Spoiler II
'65 Galaxie 500 + parts car

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HHuggins
Gearhead

Posts: 122
From: Laguna Niguel, CA
Registered: Feb 2001

posted 04-26-2001 12:43 PM     Click Here to See the Profile for HHuggins   Click Here to Email HHuggins     Edit/Delete Message   Reply w/Quote
Thanks to everyone! I'm just catching up on all my Mustang terminology. My Mach I has a standard rear end, and I'd like to eventualy upgrade to a better one.

Harley

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_ _____________________ _

Harley D. Huggins II
Laguna Niguel, CA

1970 Mach I
1998 GT Convertible
www.geocities.com/hh_machi/

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