Pinion angles, what should they be!!

Post by **LEXX** » Thu Jul 17, 2003 9:44 pm

Hey guys, seeing you fellas seem to be pretty switched on with the mechanical side of things I was wondering if anyone out there could help me with the right set-up of pinion angles.

I've just finished doing a 5.5 coil lift on the TJ and need to adjust the pinion angle so I don't go breaking a uni or anything. I got adjustable control arms upper and lower in the rear and adjustable lowers in the front, plus a double cardon drive shaft front and rear, so everything is happy is that regard.

I always had this type of stuff done by someone else and thought it was about time I learnt what I should be looking at. I've heard that about 3 degrees is the right angle I should be looking at but want to make sure, especially seeing the TJ rear drive shaft is so bloody short.

Thanx

Post by **bazooked** » Thu Jul 17, 2003 9:51 pm

if ya change ur pinion angles in the front arent u going to alter ur castor angle?

Post by **LEXX** » Thu Jul 17, 2003 10:56 pm

Um yer you're right but unfortunately the TJ don't have alot of adjustment as far as castor goes. I have some castor bolts installed in the front but that about as far as I goes.
Good question though, again I'm a bit of a novice on this.

Post by **bazooked** » Thu Jul 17, 2003 11:12 pm

if ya want the right castor in front u might want to remove diff ,cut and rotate balls

Post by **LEXX** » Thu Jul 17, 2003 11:38 pm

Cut and rotate balls sounds painfull :lol:

Post by **Damo** » Fri Jul 18, 2003 12:17 am

LEXX wrote:Cut and rotate balls sounds painfull

Sell it and buy a zook :finger:

Post by **Damo** » Fri Jul 18, 2003 12:19 am

Damo wrote:
LEXX wrote:Cut and rotate balls sounds painfull

Sell it and buy a zook

Actually, I would sell it and buy a Lada before I let some one cut and rotate my balls!!! :finger:

Post by **LEXX** » Fri Jul 18, 2003 12:22 am

Sorry mate would never part with the TJ, Jeep is in the blood. We have 3 in the family and couldn't break family tradition.

Post by **HSV Rangie** » Fri Jul 18, 2003 8:20 am

the correct set up is

single uni at each end of shaft.
Both pinions to be in the same plane parralel to each other.

Double cardan joint at t/case single uni at diff:
diff pinion is to point at t/case output.

Michael.

Post by **LEXX** » Fri Jul 18, 2003 8:52 am

Thanx Michael, just need to go and do it now!

Post by **Damo** » Fri Jul 18, 2003 10:26 am

As bazooked said i think it's gonna cause some problems with your castor

Post by **HSV Rangie** » Fri Jul 18, 2003 10:36 am

To do things properly.

fix pinion angles to one or the other.

Get a wheel alignment
rotate swivel housings to corect castor.

Michael.

Post by **FireTruck** » Fri Jul 18, 2003 11:45 am

Hey Chistian,

since you have adjustable upper and lowers in the rear, you can adjust your pinion angle and wheelbase to suit...

As already mentioned, your rear pinion should point at your t'case output (couple of degrees bleow it actually to account for the torque rotation under power). Then flex up and see where your tyre fits in the wheelwell when stuffed... then you can crank the uppers and lowers in or out to get everything to fit.

Go for the longest wheelbase you can while keeping the tyre in the wheelwell.

For the front, I think the TJ runs 5-7 degrees of castor. You have adjustable lowers in the front, so you can adjust that also with an angle finder if you have one - but this may be better done when you get an alignment.

You will have to get an alignment anyway if you have lifted more as your front alignment will be out... you can get this close using a pipe wrench on your tie rod, then re-centre your steering wheel by adjusting the drag link.

Give me a call if you need more info/help.

S.

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Pinion angles, what should they be!!

Pinion angles, what should they be!!

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