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Author
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Topic: rolled spring perch pics (please)
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SundanceKid
Gearhead Posts: 1137
From: UT
Registered: Feb 2001
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posted 03-05-2003 04:13 PM
   
Does anyone have a pic of a rolled spring perch?
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Fstln69
Gearhead Posts: 355
From: Westmont,il
Registered: Jan 2003
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posted 03-05-2003 04:35 PM
Only in my mind after i got out of the car about 60ft out and seen the pumpkin pointed at the floor and the driveshaft on the ground  ------------------
69 fairlane 351w 12.94@103mph before M&M.. after??
always in search of more HP and faster ET'S Fstln69 Pics Page
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steve'66
Gearhead Posts: 7226
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 03-05-2003 04:52 PM
I didn't take pictures either,  SteveW
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afret
Gearhead Posts: 144
From: Lancaster, CA
Registered: Feb 2003
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posted 03-05-2003 06:54 PM
Isn't it the back half of the spring perch that bends upward as the pinion rotates toward the floorboard. My spring perches were bent in a nice curve only on the back half. I had them replaced with thicker than the stock ones and had the back side boxed in.
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Buster
Gearhead Posts: 1238
From: Orlando
Registered: May 2002
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posted 03-05-2003 07:01 PM
quote:
Originally posted by Fstln69:
Only in my mind after i got out of the car about 60ft out and seen the pumpkin pointed at the floor and the driveshaft on the ground
lmbo,heheh
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Ryan Wilke
Gearhead Posts: 1700
From: Stanton, Michigan 49707
Registered: Oct 2000
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posted 03-05-2003 07:54 PM
quote:
Originally posted by Fstln69:
Only in my mind after i got out of the car about 60ft out and seen the pumpkin pointed at the floor and the driveshaft on the ground
...AARRggggghhh!!!!
What an ugly memory flashback!!!
Who would WANT to take pics of such an ugly and sorry sight!!?? When my perches collapsed & twisted, it broke my rear U-joint, bent the new driveshaft and bent both OEM 31-spline axles! With the pinion pointing up at the trunk, I had to recruit a few big boys to help load it on a trailer and haul it off....Luckly, the carrier was OK. However, I had to remove the rearend and take it 80 miles to National Drivetrain. They checked the housing for straightness, cut off the flattened perches, welded on new ones with gussets at both the front & back open ends, then back down I when to get it and pay the large bill....to later determine that they welded the perches on out-of-sink with the proper pitch/pinion angle.......All in all, it was UGLY!! This is why I asked BlueStreek in another thread if he's boxed his perches yet.... I'd hate to see/hear about him doing it too! Ryan  [This message has been edited by Ryan Wilke (edited 03-05-2003).]
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RobsRestoMod
Journeyman Posts: 29
From: Spring, Texas
Registered: Jun 99
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posted 03-05-2003 08:19 PM
Does anybody have any pictures of there perches after the boxed them in?Thanks
Rob
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Fstln69
Gearhead Posts: 355
From: Westmont,il
Registered: Jan 2003
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posted 03-05-2003 08:58 PM
we just took a piece of flat stock and welded it from the perch up to the housing.I used a set of mopar connection perches they were stouter then the stocks then boxed em------------------
69 fairlane 351w 12.94@103mph before M&M.. after??
always in search of more HP and faster ET'S Fstln69 Pics Page
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Fstln69
Gearhead Posts: 355
From: Westmont,il
Registered: Jan 2003
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posted 03-05-2003 09:01 PM
quote:
Originally posted by Fstln69:
Only in my mind after i got out of the car about 60ft out and seen the pumpkin pointed at the floor and the driveshaft on the ground
The only up side to it was that was the first time out to the track i hadn't even drove it on the street yet and it felt like a 10sec car as it came apart 
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69 fairlane 351w 12.94@103mph before M&M.. after??
always in search of more HP and faster ET'S Fstln69 Pics Page
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bluestreek
Gearhead Posts: 1460
From: Athens,GA
Registered: Jul 2001
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posted 03-05-2003 09:45 PM
quote:
Originally posted by Ryan Wilke:
...AARRggggghhh!!!!
What an ugly memory flashback!!!
Who would WANT to take pics of such an ugly and sorry sight!!??This is why I asked BlueStreek in another thread if he's boxed his perches yet.... I'd hate to see/hear about him doing it too! Ryan [This message has been edited by Ryan Wilke (edited 03-05-2003).]
I have to admit that my perches are still hollow! 
My welder is broke, so I was thinking about cutting a piece of iron to fill the hole and epoxy it inside the perch. Would that work to get me through my first outing Saturday? Dan
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1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank and girdle, 5.4 H-beams, Forged slugs, ported TFS alum. heads, ported Stealth 8020 intake, CompCams Xtreme Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi, BFG Drag radials..
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steve'66
Gearhead Posts: 7226
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 03-05-2003 11:09 PM
quote:
Originally posted by bluestreek:
I have to admit that my perches are still hollow!
My welder is broke, so I was thinking about cutting a piece of iron to fill the hole and epoxy it inside the perch. Would that work to get me through my first outing Saturday?Dan
NO,
Epoxy is no match for the torque generated. Tighten the U-bolts to 100 ft pounds of so and cross your fingers. SteveW
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bluestreek
Gearhead Posts: 1460
From: Athens,GA
Registered: Jul 2001
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posted 03-06-2003 12:18 AM
Looks like a couple of 2500 rpm launches and 6000 rpm shifts will have to do the first time out unless I find time to get it welded up. That should be enough to let me know what it's capable of until I can get everything squared away. I have a friend with a roll-back truck close by, just in case I get "carried away". thanks.
Dan
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Ryan Wilke
Gearhead Posts: 1700
From: Stanton, Michigan 49707
Registered: Oct 2000
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posted 03-06-2003 09:02 AM
Dan,
You're not running a commuter engine any longer!
If I were you - I'd measure up the exact dimensions of the 4 pieces you'll need approximately ~2" square) to be welded to the front & back of both of your perches, then take your car to a Mom & Pop fabrication shop, WE-R-WELDING shop, or maybe even a muffler shop (if you brought the metal pieces) may be able to weld them in for you for not much $$$......that is assuming that your perches aren't too badly rusted now... If they are, they should be replaced anyway.If you think, "...I'll just do low-rpm launches,,,," -- you're just fooling yourself & asking for trouble!! You've put too much time, $$$, and sweat into your car to start cutting corners and taking chances now! Just my 2 cents,,,, Ryan
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bluestreek
Gearhead Posts: 1460
From: Athens,GA
Registered: Jul 2001
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posted 03-06-2003 01:01 PM
I hear you Ryan W.
Here's a rear view of my drivers side perch. 
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SundanceKid
Gearhead Posts: 1137
From: UT
Registered: Feb 2001
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posted 03-06-2003 03:34 PM
Mine look the same. I just don't see how that could be rolled over? Where the U bolts tight? Where you guys using Lakewood traction bars? 32 inch wide slicks on a 1000 HP alky dragster?
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steve'66
Gearhead Posts: 7226
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 03-06-2003 03:40 PM
quote:
Originally posted by SundanceKid:
Mine look the same. I just don't see how that could be rolled over? Where the U bolts tight? Where you guys using Lakewood traction bars? 32 inch wide slicks on a 1000 HP alky dragster?
Look at the back of the perch in the pic, and imagine it squashed up tight against the axle tube. That's what rolled perches look like. Yes Lakewood traction bars, 10" et street tires, 12 second car. The bars only hold the U-bolts in position. The axle spins in the u-bolts and the result is rolled perches. I used to think it wouldn't happen to us too.  My next project is using a 9" rear too. I boxed those perches before I installed the rear. Live and learn, SteveW
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H8CHEVY
Gearhead Posts: 278
From: Southern Cali
Registered: Jun 2000
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posted 03-06-2003 04:10 PM
Steve W, you dont happen to have a pic of boxed perches, or would be able to take one would you?? ------------------
"In the wise words I was once told bye Jiggy"
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Ryan Wilke
Gearhead Posts: 1700
From: Stanton, Michigan 49707
Registered: Oct 2000
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posted 03-06-2003 04:52 PM
quote:
Originally posted by SundanceKid:
...Where the U bolts tight? Where you guys using Lakewood traction bars? 32 inch wide slicks on a 1000 HP alky dragster?
Not quite....N/A 306", 9" slicks, SSM bars, 4-speed, TnT night. Yes, my U-bolts were tight; it was my first time at the strip with the SSM bars. I make it a practice to drive it a bit in the pits then check over all the lugnuts, U-bolts, etc. to ensure any 'settling or such' is re-checked. Then to the box, hazed the tires, then to the line; dropped the hammer and then it all slammed & the perches collapsed. My U-bolts were loose after the collapse but I think the instant pressure loading on the leaf spring system caused the OEM spring plates to also bend up (forgot to mention that earlier - If you haven't already, I'd see about some better material than OEM for spring plates). I went back over the paperwork that came with the SSM bars and. Lo-n'-behold, right there in black n' white it said, "We highly recommend that you box or gusset your spring perches or catastrophic results may occur!". I can't provide you with a pic, but just imagine taking a sledge and pounding the perch down flat against the axle tube... that's what mine looked like! Also: Thank goodness I had a driveshaft loop or my floorboards would of been beat to HE!! by the whirling shaft (it broke the rear U-joint)! Ryan
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Fstln69
Gearhead Posts: 355
From: Westmont,il
Registered: Jan 2003
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posted 03-06-2003 07:50 PM
quote:
Originally posted by Ryan Wilke:
I went back over the paperwork that came with the SSM bars and. Lo-n'-behold, right there in black n' white it said, "We highly recommend that you box or gusset your spring perches or catastrophic results may occur!".
Ryan
Cal-tracs has the same wording in there instructions.Don't let the "it won't happen to me them guys did something wrong"play in your head BOX THE PERCHES only reason i didn't was i am a chevy guy and knew nothing about fords....Learned Quickly------------------
69 fairlane 351w 12.94@103mph before M&M.. after??
always in search of more HP and faster ET'S Fstln69 Pics Page
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Mark T 7724
Gearhead Posts: 100
From: Palmdale, CA
Registered: Nov 2000
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posted 03-06-2003 08:09 PM
I've built several High HP Stockers and some slower ones and it's one of the first things that is done to the rear end, They will roll it's only a matter of when.
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SundanceKid
Gearhead Posts: 1137
From: UT
Registered: Feb 2001
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posted 03-06-2003 11:47 PM
That's just crazy..LOL I wouldn't have ever thought it possible. I have never come across flatened perches, or even heard of it till recently.
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jkilroy
Gearhead Posts: 1797
From: Vicksburg, MS
Registered: Dec 99
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posted 03-08-2003 12:43 AM
No doubt a little extra meat in this area is money well spent. Look to the off road guys for pointers here. Check this site, they sell custom perches, note the heavy material and how much farther around the axle tube the reach, and they box brace them to boot! http://www.bigballsoffroad.com/prod142.htm However, if you are going through the trouble, its not like spring perches are rocket science, make your own from pennies worth of scrap. Here is an article on how to make your own bullet proof perches. Talk about stout! http://www.off-road.com/chevy/tech/perch/ ------------------
Jay Kilroy
68' Fastback GT 390
"No such thing as a cam thats too big"
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n2oMike
Gearhead Posts: 1805
From: Spencer, WV
Registered: Jan 2001
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posted 03-08-2003 09:13 AM
In case anyone is still wondering what 'boxing the perches' means... You just lay a flat piece of metal from the end of the perch to the axle tube. This will keep the perch from bending up when the axle tries to rotate. Ignore the piece of boxed tubing in the picture. A flat piece of 1/8" or thicker steel layed in place between the end of the perch and the axle tube, welded in all the way around, is all that's needed for 99% of all applications.  Good Luck!
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Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220
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