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Old 05-12-2005, 00:27   #1 (permalink)
Mr XE
 
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Diff / Gearbox angles ?

I've replaced my busted C4 with a reco toploaed, i still run a standard borg warner rear end lowered about 1 1/2 inches. The car constantly munches out rear uni joints, i've had the front pinion bearing replaced and the tailshaft balanced. A mate from work sugested that my angles are wrong, i dont understand why though i've had a fair few lowered XE falcons befor and never had a problems like this. Has anyone else out there had any problems like this befor with toploaders in XE falcons?

Thanks for having a read and any help would be greatly appreciated.
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Old 05-12-2005, 03:42   #2 (permalink)
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Re: Diff / Gearbox angles ?

Lowering the car increases the included angles that the uni joints runs at. Uni joints have specific angles that are ideal for long life. The big killer though for uni joints is tramping the rear axle; they cannot handle this.
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Old 05-12-2005, 03:49   #3 (permalink)
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Re: Diff / Gearbox angles ?

apart from raising the ride height of the car what can be done to stop these problems?
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Old 05-12-2005, 05:15   #4 (permalink)
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Re: Diff / Gearbox angles ?

Quote:
Originally Posted by mr_xe
apart from raising the ride height of the car what can be done to stop these problems?

Are you having axle tramp?

If you are then fitting radius rods (tramp rods) will limit the diff twisting/rotating the pinnion upwards and stop the massive angles being experienced by the uni joints.
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Old 05-12-2005, 17:53   #5 (permalink)
Mr XE
 
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Re: Diff / Gearbox angles ?

XE falcons have a factory 4 link styled rear end, i've never had any sign of axle tramp. The tail shaft is running parallel to the ground and is very straight between diff and box so i don't think that excessive angles are the problem.
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Old 05-12-2005, 20:13   #6 (permalink)
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Re: Diff / Gearbox angles ?

Quote:
Originally Posted by mr_xe
XE falcons have a factory 4 link styled rear end, i've never had any sign of axle tramp. The tail shaft is running parallel to the ground and is very straight between diff and box so i don't think that excessive angles are the problem.

Sorry about that. Running the unis too straight i.e. no working angle is bad for them as well. What brand of uni joints are you running.
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Old 05-12-2005, 20:30   #7 (permalink)
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Re: Diff / Gearbox angles ?

The box and diff centrelines should be as parrallel as possible.
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Old 05-12-2005, 20:36   #8 (permalink)
Mr XE
 
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Re: Diff / Gearbox angles ?

ive tryed just about every sort i could find, ive been changing the unis all most weekly.
so would you konw why is this car having these problems when my others didnt??? could it be because of the way the toploader sits under the car as apossed to other gear boxes? this is the only xe that ive owned with a toploader i think it could have something to do with that.
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Old 05-13-2005, 16:55   #9 (permalink)
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Re: Diff / Gearbox angles ?

http://www.superchevy-web.com/techni...203sc_driving/

http://www.carcraft.com/howto/91758/

You can buy a cheap angle guage at Mitre 10 for around $5-$10 from memory.

I have to ask; it is not possible that you are damaging the uni joint on installation? Something has to severly wrong to chop out uni joints in a week or two.
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Old 05-13-2005, 19:52   #10 (permalink)
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Re: Diff / Gearbox angles ?

I used to be the same. The fix was remove lowering blocks and reset leaf springs
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