Hi Guys A need some help identifying my rear end because of some leakage on the pinion oil seal and i need to replace it A have 1973 Buick Centurion 455-4 with a posi track rear end but in don't know which one I have tried to identify it based on the rear cover and i think it is a 10 bolt 8.5 but i am not sure I have tried the identification numbers and the casting number but nothing comes up on the internet the identification number on the front of the passenger side tube is VA P095 And the casting number on the housing is 480632 Does anyone can tell me what kind of rear end in have Thanks in advance
It should be a 9 3/8" ring gear. There are two 9 3/8 " rear units. The unit before the 71 model year is Buick only and not the same as yours. The 9 3/8" after the 70 model year is BOP. Check with others to confirm this information. VA = 2.73 RATIO WITH LIMITED SLIP Around 73 Buick also introduced a 8 7/8" diameter ring gear option. So check with others if that is a possibility. In order for it to be an 8.5", it would need to be a 350 cid engine. If you take off the cover, you can measure the ring gear or get the part numbers to identify the unit.
It's a 10-bolt cover,which looks similar to an 8.5" cover,but is larger.This rear has a large 12-bolt ring gear.
ID the rear That is a 10 bolt cover 12 bolt ring PONTIAC FULL SIZE car rear end It will have 31 spline bolt in axles Posi units were Eaton 4 spring units...looking similar to the eaton in a early 12 bolt truck Ring gear bolts are 7/16 x 20 and are Left hand thread These rears were used in the mid performance engine B O P and Chevy wagons. So a 350 or 400 engine in a Buick Olds Or Pontiac got this rear. era is 1971-1976 Axle spline pitch is 45 degree cut. 9 3/8 rears were used in the 455 cars and BOP wagons 12 bolt cover 12 bolt ring. They used this form of differential all the way to 1985 in wagons and Deville rwd cars. They nuder-ed it with c-clip axles and only 28 spline the further into the 80's it went... Pinion shaft was only 1.625 also same as a 10 bolt 8.5 too. 77-85 was the rera for that rear...USED THE SAME cover from 1965-1985 later models got a fill level plug in the cover that was about the only difference in the cover. Hope that covers it. OH, No aftermarket support for the rear on posi units BUT AGAIN Fabcraft made 1 gear set 3.55 if you can get them to make that one again too. I have clutches for your posi unit I have bearing kits also gear sets will range from 2.28 - 3.42 ratio 1965-1970 gear sets range from 2.56 - 4.33 that I know off in GM...Might have had 4.56 4.88 also they r=aced the Catalina 2+2 with this rear. Jim J D
thanks guys I only need the Pinion seal and perhaps the crush sleeve for this axle Would this seal fit ? http://www.dennysdriveshaft.com/p87...seal_fits_chevy_12_bolt_car__truck_rear_.html Or were can i buy the right one thanks
Your link is for a 12 bolt Chevy truck. Contact Monzaz above for the correct stuff. http://jdrace.com/
According to rockauto, this is the seal, but I would check with Monzaz. http://www.rockauto.com/en/moreinfo.php?pk=1835254&cc=1013577&jsn=386
Don't be ashamed, we all have a little leakage from our rear ends every once in awhile. Just look in a mirror, you'll recognize once you see it. Oh, wait, are we not talking about the same thing?
Thanks again I know our cars mark their territory :beers2: But it also creates a mess underneath the car and the mufflers
Same as a Pontiac GTO seal from 1966-1972 2043 Timkin number Which is the same seal a 10 bolt 8.5 seal is, It is one of GM'S most popular seals ever. You should have NO problem finding the seal at any Auto store. NOW THE crush sleeve is a total different thing. lol. Auto stores will not have this parts. Just PM me we have everything on the shelf. Jim J D Jim
Thanks guys I have opend it up and replaced the seal, lookt at the gears and they are in good shape Closed it back up and filled it with new fluids no leakage anymore so all is fine now Thanks a lot for your help
