12-bolt rear end problems - Team Camaro Tech
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post #1 of 13 (permalink) Old Oct 8th, 02, 03:41 PM Thread Starter
 
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i have a 68 camaro with a multi leaf suspension, SSM traction/liftbars,mark williams spool, mark williams high torque axles, mark williams c-clip eliminators. With
550 naturally aspirated HP and an additional 100 horse nitrous boost. I drive this car almost every day during the summer. the leaf spring perches are ripping loose from the axle tubes. The tubes are cracking, the cracks have spidered out and the tubes leak oil. I have quit driving the car until I can resolve the problem with a permanet, safe, dependable solution . I think the spool is probably causing the majority of the problem. I just want to get as many opinions as possible on what you guys think I should do? I am leaning toward a custom axle. Unless anyone knows a cheaper solution or some one who can retube axles for a reasonable price.
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post #2 of 13 (permalink) Old Oct 8th, 02, 04:02 PM
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John
 
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Get rid of the spool. It is the cause of your problems, not to mention being dangerous to drive on the street.
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post #3 of 13 (permalink) Old Oct 8th, 02, 04:34 PM
 
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DITCH the spool. Install an Eaton.

I think this guy is going to be one of your only choises:

(Bob)Meyer Engineering 619-440-7701

This guy builds Top-Fuel/Funnycar chassis for a living. I use him specifically to straiten housings after modifications IE(changing housing ends, building a trussed housing for offroad applications, building four link suspensions, things that have been in accidents, etc....) He is really, really good.



[This message has been edited by chacane67 (edited 10-08-2002).]
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post #4 of 13 (permalink) Old Oct 8th, 02, 06:11 PM
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What numbers are you turning at the track, on the motor?
just out of curiousity.

[This message has been edited by CamaroNOTcamero (edited 10-08-2002).]
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post #5 of 13 (permalink) Old Oct 8th, 02, 06:48 PM
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Freddie
 
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I have seen this happen a few times. I have a '69 Z-28 housing that did the same thing. I'm saving it for some new tubes. The spring mounts need to be gusseted to keep the tubes from tearing. You may be able to repair the tubes that are in it. If you can't then you may want to get a 8.2 10 bolt housing and remove the axle tubes from it to install in the 12 bolt. You could also send the housing to Moser Engineering and have heavy duty tubes installed with their housing ends for the 9" Ford axle bearings. This would be better than the C clip eliminators.

------------------
'69 RS/SS396 pro street
427/4spd/9"
Byars Performance
High Performance Drive Train Parts And Service
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post #6 of 13 (permalink) Old Oct 9th, 02, 07:52 AM
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All right, I have to ask,

How does one remove the steel tubes from the cast iron section to reuse?

------------------
Everett "OBJECTS IN THE MIRROR DISAPPEAR UPON RAPID ACCELLERATION"
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post #7 of 13 (permalink) Old Oct 9th, 02, 08:17 AM
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Freddie
 
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The tubes are pressed in and plug welded. You will have to drill or cut the welds out. You can cut the tubes off of the 12 bolt next to the center casting and then split the tube inside to get it out. To get the tubes out of a 10 bolt you will probably have to split the casting.

------------------
'69 RS/SS396 pro street
427/4spd/9"
Byars Performance
High Performance Drive Train Parts And Service
www.lubedealer.com/biggearhead
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post #8 of 13 (permalink) Old Oct 9th, 02, 12:12 PM
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Jeff
 
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I welded a 2 inch wide 1/8 inch peice of strap steel over the axle to both ends of the perch. it cured my problems!
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post #9 of 13 (permalink) Old Oct 9th, 02, 12:20 PM
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Wouldn't a 4 link prevent this problem?
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post #10 of 13 (permalink) Old Oct 9th, 02, 01:18 PM
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no, i doubt that a 4 link woulr cure it.

I do hope you realise that the 4" strap is a temp fix!
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post #11 of 13 (permalink) Old Oct 9th, 02, 04:05 PM
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Jeff
 
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well, i don't run a spool either, but i was having problems with my perches and a local dragracer suggested the straps, it's been fine for years.
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post #12 of 13 (permalink) Old Oct 9th, 02, 04:10 PM
 
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I agree with jcdubs, a simple strap will stop your perch problem.....and you will also want to weld the tubes to the center section. It will be your next problem....
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post #13 of 13 (permalink) Old Oct 10th, 02, 03:37 AM
 
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Gusseting/Assure full welding of the existing perches to the housing and using some BMF U bolts (Like supplied by Hotchkis with their lowering springs) to clamp the axle to the lower spring shock mount plate would do it. I see you have the SSM traction/liftbars. Doesn't that make you use an angled u-bolt? That could be part of the problem. Traction bars when not properly gapped can cause this very thing.
I have seen this issue before. What amount of TQ do you have? , that is what is killing the perches.....

------------------
Y2K YELLOW C5
BEST TIMES W/ BALD @#% EMT's & POWERLOADER II:
60'=2.02
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1/[email protected] (3,470 lbs. race ready)
1999 GMC SHORT BED SLE
1996 IMPALA SS (4,360 lbs. race ready)14.82 @ 92.59 MPH
1972 ELCAMINO (UNDER RESTORATION!)
1968 CAMARO COUPE (3,490 lbs. race ready))13.80, 1.94 60' & 100.44 MPH
1966 Mustang Hardtop (UNDER RESTORATION!)
Vice-Chairman, Virginia Section of SAE.
Link to my 10/12 bolt conversion http://temp.corvetteforum.net/c5/30s...pictures.shtml
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