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Old 02-23-2006, 01:36   #1 (permalink)
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MORE FRIGGEN xe nine inch trouble

Hey guys,,just put my tailshaft on my xe with the new 9 inch diff and it looks to have quite a large pinion to tailshaft angle,,at the uni between cap ubolt and the tailshaft i have a 30 mm gap at the bottom and a 10 mm gap at the top just to give you an idea of the angle,,is this normal?

Are they trying to make up for acceleration twist of the diff,,this is useless to me since its a circuit race car and has stiff bushes in it.

Anyone elses diff look like this.

Cheers Marty
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Old 02-23-2006, 02:41   #2 (permalink)
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Re: MORE FRIGGEN xe nine inch trouble

I'm trying to picture it. I honestly can't visualise it. I know the pinion angle at the diff should only be around 3 degrees. Aparently GT's had more pinion angle. The only way to tell if it's correct is drive it.

If it's too far out of wack? It'll vibrate like a bastard. If it's right it'll be smooth as silk. I had plenty of issues with pinion angle in my car. Kept blowing out uni's. Spent quite a few $ sorting it too.

If I'm visualising it correctly? It's pointing down correct? As it's supposed to point down while sitting. They twist upward quite a lot under accelleration.
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Old 02-23-2006, 04:02   #3 (permalink)
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Re: MORE FRIGGEN xe nine inch trouble

The hard part is...
he is obviously looking at this jacked up.

Now is it beeing supported on stands by the body or the diff...this will change the visualised pinion angle...by shit loads!

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Old 02-23-2006, 04:59   #4 (permalink)
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Re: MORE FRIGGEN xe nine inch trouble

Here you go!! A picture says a 1000 words

Yeah, you need to check the angle when the car is level with no jacks, if that's what you've done.

Those measurements you gave equate to about a 15 degree pinion / driveshaft angle which is HUGE!! You only want about 2-3 degrees otherwise you'll get lost of vibes etc. How does it feel when driving normally and under load?

Take it to Truckline or Hardy Spicer (driveshaft specialists) and they'll measure your angles for free over the pits.

Other info that's important is that the diff pinion angle must be the same as the gearbox yoke angle. The diff pinion and gearbox output shaft must also be parallel. eg: diff points up 2*, then gearbox should point down 2* etc. This allows the unijoints to function correctly.
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Old 02-23-2006, 16:27   #5 (permalink)
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Re: MORE FRIGGEN xe nine inch trouble

heres a helpful link: http://www.streetissuecustoms.com/pinionangle.html
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Old 02-23-2006, 23:25   #6 (permalink)
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Re: MORE FRIGGEN xe nine inch trouble

Thanks guys id say it has to be more than 3 degrees,,the car is on stands but the stands are on the axles not the body.
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Old 02-23-2006, 23:45   #7 (permalink)
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Re: MORE FRIGGEN xe nine inch trouble

Sounds like you have BIG dramas. If the suspension is loaded (ie weight on the axle) then the figures you gave are no good for your car. I personally wouldn't even try and drive it.....

Also, this isn't quite right.

Quote:
Originally Posted by TruBlu351
Other info that's important is that the diff pinion angle must be the same as the gearbox yoke angle. The diff pinion and gearbox output shaft must also be parallel. eg: diff points up 2*, then gearbox should point down 2* etc. This allows the unijoints to function correctly.
The slip joint (spline) will allow for difference in uni operating angles. If the tailshaft couldn't change length, then they would have to be the same. I've seen vehicles that have huge differences (5-10 degress) between unis and work fine.....
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Old 02-23-2006, 23:55   #8 (permalink)
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Re: MORE FRIGGEN xe nine inch trouble

GREAT this will be the third time ive assembled the diff then pulled it apart again and i havnt even driven the car yet,, if i have one more problem im going to bag the company that did the diff

Thanks for all your help guys,,ill give them a ring in the morning and see what they think
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Old 02-24-2006, 04:03   #9 (permalink)
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Re: MORE FRIGGEN xe nine inch trouble

Yer Mate,
sounds like they have welded all the brackets in the wrong place.
Coil suspension diffs are harder to do.

Not sure but i think i posted somewhere last night about using an EB V8 diff centre. Tough as a 9 inch! The EB (or later) V8 diff runs 28 splines, the axles are the same diameter.... 4 pinion spider gears. They put 300kw to these so they aren't weak.
not sure if the EB housing would bolt in tho...haven't checked it....YET

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Old 02-24-2006, 08:16   #10 (permalink)
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frown Re: MORE FRIGGEN xe nine inch trouble

im sorry to have to say this but rpo83 is correct ,
infact the pinion angle on cars with leaf springs are around 6 degrees .
on a car with a four link suspension the pinion angle can vary depending on the type of bushes used eg; an aftermarket stainless four bar usually has small bushes therefore not alot of flexing will occure as compared to a production car set up with thick bushes ,
the thicker the bush the more flexing occures and the more pinion angle needed to compensate ,
leaf springs are the worst for this as they not only have thick bushes but also the spring its self binds up and flexes just near the front eye
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