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Old 02-13-2006, 02:12 PM
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Advice on installing carrier

Ok , I have a GM 7.50 ring & pinion. I am ordering a Auburn High
performance Carrier from Moser Eng. I am not removing the pinion just the carrier . The ring gear will transfer to the new unit , staying with 3.73 ratio . Be for removing the assemble i should check the backlash and the preload on the bearings correct ? On Assembly ALL that is needed is to rest both of these and all should be good ??? If this is not the way to do this please help me out to get this right .

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Old 02-14-2006, 07:25 AM
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It should swap in with little problem, since you are not messing with the pinion shaft at all, you should pretty much set back to specs you measured before replacing the carrier, and try to match those up.

You will still want to check gear tooth mesh pattern after the new carrier is in and make sure this works to specs too.
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Old 02-14-2006, 08:25 AM
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If you are installing new carrier bearings then you need to be mindfull of the backlash. It should however not change much if any at all with new bearings. Just keep the carrier shims in their proper places in the housing and you will be fine. The carrier will be a little harder to get back in with new bearings, but it will go with a little gentle persuasion.

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Old 02-14-2006, 01:42 PM
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you shouldnt have to worry about the pinion shims, just get the bearings pressed on, and install the carrier, if you keep the shims in order youll be close to the .009 -.012" backlash, use a dial indicator on the ring gear with the pinion gear stationary, MAKE SURE YOU CHECK BACKLASH WITH CARRIER PROPERLY TORQUED AND SPIN IT A FEW TIMES! if your backlash is off, you might have to go to your local transmission shop and aquire some small shims( bring one with you).
after you get the backlash in tolerence, "paint" 4 gears on the ring gear with either white lithium grease, or paint to ensure proper tooth placement. spin the rearend a couple of times and see where the gear is riding. it should be pretty much in the middle of the ring gear, if not, pinion shims will be needed.. along with a new crush collar.

good luck.. oah and yea... dont do what i did on my first ring and pinion insall
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Old 02-18-2006, 02:46 PM
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Using the existing ring and pinion gears the pinion depth will not change. The new carrier with new bearings will still be concentric to the bearing housing and pinion depth will not be altered.

Install your new carrier and new bearings with the old ring gear and adjust the back lash to the same as it was. The tooth pattern might not be perfect but it WILL BE exactly as it was when you removed it. That is what is important.
The old ring and pinion must run with the pattern it already had because that is what it has worn to.... if you change it now the ring and pinion will probably be noisy and start an accelerated wear rate.

Use synthetic lube and the appropriate posi additive. And do not forget to prelube those new carrier bearings or they will burn up before the lube gets to them by driving.
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