ok i picked up a posi from an 82 firebird (i have an 84 without posi), just wondering if it will fit, or problems i might encounter with putting it in... what im thinking of right now is putting in the posi, take off the 82 ring gear, and replace it with my current one in the car. heres the part number off the gear itself.

GM 556692 14:41 82

so any help would be greatly appreciated

 

Have you ever set up gears in a rear end before? Its not just a swap ring/pinion gears and go type of thing. You need an entire installation kit and make sure to set the depth correctly.

 

no i havn't. thats why im asking...what would i encounter etc...what would i need....and will it work if i decide to put it in.

 

ignore what duron had to say, it's plain he's never done it either. provided you have the same series carrier and the same rear, 7.5/7.62 ten bolt all you'd need to do to swap carriers is to swap the ring gear from one to the other. then you'd need to reinstall the carrier and check back lash. if you still have the donnor posi in the original rear check the back lash and keep that number in mind when you do the swap. if not i'd shoot for around .008. thing to keep in mind when setting back lash is the total shim thickness of the carreir shims can not change, however the arrangement of them can, in other words you can move shim thickness from side to side to get your back lash. if the bearings are fine you don't need to change bearings and if you don't change ratio you don't have to set pinion depth.

 

yeah i havn't done it either...the posi was a take apart and take sorta deal.... the plan was to change the ring gear providing its the same size.......backlash....i keep reading about it but not exactly told on what it is.... is that when you have everything put back together and spin the axel the amount of play in it? as well shims they go in each side where you;d bolt down the posi right to make sure its mounted correctly and even (basically a fancy name for a spacer sorta deal?)?

 

yeah the shims look like spacers, you can use 1 thick one or a stack of thinner ones as long as the total thickness doesn't change. back lash is the clearance between the ring and pinion teeth, or the amount of movement there is before the teeth engage. check it with a dial indicator on a ring gear tooth and turn the carrier with a wrench on a ring gear bolt.

 

is there a way to find out if its a 7.5 or 7.65 ? from the rp0 codes on my car, it says i have a 3.23 gear in the back (series 3 carrier) and i don't have the donor car rp0 codes, but it did come from a 10 bolt. but i still have the old ring gear on the posi from the 82 ta. could i just count the teeth? also another beginner question what is the spline...i keep getting tol as long as the spline matches it should be ok.... im not sure whats in my car,,, but is that the geat thats off the driveshaft that basically moves everything? (ive been told its either a 28 or 26 spline) (no clue what it means tho...

 

spline is the number of splines on the axle, just slide your axle into the donner carrier, if it fits you're good to go, if not then you're not. the ratio is stamped into the ring gear, it'll look like 43:11 just do the math and you'll have the ratio. 7.5 and 7.62 is the same thing, just GMs way of messing with your head.

 

No I haven't done it before, but from everything I've been told, when you are taking parts out of one rear and putting them in another, the pinion depth and backlash should be checked and re-set if necessary. Make sure everything is shimmed exactly as it was. Depending on how many miles are on it, it wouldn't be a bad idea to rebuild with new bearings anyways.

All the parts you have, assuming original pieces, are all 26-spline. OEM 28-spline parts didn't come out until late 88 or 89.

EDIT: Though now that I did re-read the first post again, I see you're going to be using the same gears and not touching the pinion gear, so depth should be fine. Either way, check the backlash as stated above. Sorry, was thinking you were changing the gears for some reason as well. Read through it a bit fast I guess.

 

pinion (gear thats on the driveshaft correct?) yea if thats it i will be leaving it there... and i will be changing the one ring gear from my car onto the posi.... so basically all i ahve to do is (if theres shims) keep them in there? and if not is there a tool to check how many shim's id need or take out...cause i assume that the posi unit would have to be even or level to have it work properly without any kinks.

 

ok heres all the numbers i could get from the 82ta carrier and ring gear.

ring gear : GM 558692 14:41 3 82

the bearing covers i guess that go on each end of the carrier that protect them from the retaining clips:
Hyatt- CLark - LMS(or 5)01314 - RA

Retainers: 70 - 703 and 71 - 703

then on the posi unit where you can see inside of it through the opening the only numbers i could see are 826 and on the opposite side of the opening was 7

 

Interesting gear ratio. 41/14 = 2.93 gearing

 

so basically with that said

is this what i would need to have the carrier work since 2.93 would mean its a series 2 carrier?

23-875342-X Strange Pro-Street Gears, 3.42 Gear Ratio, 2 series carrier, GM 7.5" 10 bolt rear end $225.00

http://www.thunderracing.com/catalog...&vid=6&pcid=67

 

you cant use the pinion gear you already have in your car and put the ring gear from the donor car in your's, both ring and pinion are made as a matched set, if you mix up the ring and pinion gears you will have very bad whining and will lead to very fast wearing out of your gears......
always use matched sets, and if youve never rebuilt a rearend have someone with you that does know what backlash, pinion depth, and knows hows to read the teeth contact pattern, if not you will have a noisy rearend that wont last long at all
just some tips from someone whos ASE certified
hope it helps