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Anyone set up their own Rear Ends? Posted By: tbag_skywalker On: 05-16-2008 @ 02:11:56 Reply | Edit Hi guys, I'm doin my first gear change job and could use a little advice. The car is a '97 Trans Am M6 (with stock 10-bolt and 3-series carrier). I'm swapping out my 4.10 Richmond Gears, which I broke some pinion teeth off of, with a new set of 4.10 Motive Gears. I've got new shims, bearings, crush sleeve, pinion nut, and seal. I decided to tackle this job myself (and with a few knowledgable friends and beer) because the shop that installed my Richmonds never got it right since its been making noise from day one and mostly because I just really want to learn how to do it for the experience. I think I've got everything down on the install except for setting Pinion Depth. How exactly do you measure pinion depth? What tool are you supposed to use to do this? According to my kit, the pinion depth should be 3.779". If anyone can explain this it'd be awsome. Thank you. Posted By: 95ttoplt1 
On:
05-16-2008 @ 13:47:20 Reply | Top | Edit
2 different ways. There is a tool that you can buy from any gear manufacturer that bolts in where the carrier bearing caps bolt and you measure from there with a dial indicator. Kinda pricey for the tool but maybe a local shop has one you can rent. Or you can take the old shims off the pinion you are replacing stick them on the new one and set the rest of the carrier up. Run a pattern and then adjust off that. I personally have had better luck with this method. I also set the pinion a little deeper into the ring gear according to the pattern. They make a little more noise in cruise but I have never lost a ring gear due to broken teeth and I'm running 11's on 4.30's in the stock 10 bolt and have done hundreds of gear swaps. If its a stockish DD then leave the pattern as close to book perfect as you can. If you have more power or sticky tires I would play with it a little. The stock 10 bolt flexs quiet a bit when you add tires and power, the ring gear will want to open(increase back lash) and the pinion will try to push out the front of the diff, so if you set the back lash at the min imum and the pinion a little deep it will help to ofset this. --  Posted By: tbag_skywalker On: 05-19-2008 @ 03:25:52 Reply | Top | Edit so basically, if you don't have this special tool, youre saying that you just eyeball the pinion depth by the pattern it makes? dude, thanks a ton for all that, it was exactly what I needed. I'm gonna be finishing the job up on wednesday or thursday and i'll let you know how it went. The car's not making a lot of power yet, its a mostly stock LT1 with long tubes and a mild tune from a Hypertech programer. My tires are fairly sticky though, 18"x10.5" C5 Z06's with 295 wide Eagle F1's in the rear. Posted By: 95ttoplt1
On:
05-20-2008 @ 14:06:28 Reply | Top | Edit
Yep thats pretty much it. You can get the tool from Jeg's for 100 bucks. -- Posted By: 94firechicken On: 05-21-2008 @ 01:27:13 Reply | Top | Edit troy loves setting up his own rear end and lubing after he is finished -- 94 formula, turning into a trans am freshly built and stalled (custom 3200) 4l60e, Loudmouth, Tuning by troy (needs more) T/A hatch, rear bumper, sideskirts, front bumper. soon to be Viper Steel grey.
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