https://www.amazon.com/clouddrive/s...TWliVIrwfzf?v=grid&ref_=cd_ph_share_link_copy https://www.amazon.com/clouddrive/s...U6ICtvPx9Hc?v=grid&ref_=cd_ph_share_link_copy Hey all, is this a standard GM 10 bolt or is it a Buick, or Olds or something different? It is a buick skylark custom with 350 engine standard.
So, should I just get the gears swapped out, or should I get a standard chevy 10 bolt and put it in? (Is it more expensive to do the Buck 10 bolt?)
By looking at the pictures I can see that you have the standard rear that came with all the 71-72.Its the 8.5,very desirable, with a lot of parts around for it, new and used.Bruno.
This. The Buick 8.5" 10 bolt is a very good rear. No c clips (the Buick 8.5's used bolt in axles) and can be built very strong. Contact "Monzaz" here on the board and he can set you up with everything you need very reasonably. He built my 8.5 and it'll take anything my 540hp/580tq BBB can throw at it.
It sounds like there is conflicting statements. So, is this the standard GM 10 bolt with the 8.5? http://www.summitracing.com/parts/sum-741001/overview/ I am good with a wrench but have never done a GM rear end or transmission for that matter. I changed an 8" ford pumpkin but that is it for gears. The whole pumpkin was a piece of cake to change in my 66 mustang. Are changing the gears as hard as everyone says it is? I dont mind buying a few tools to do the job. Also, If it's not that hard to do, I can afford a set of gears right now for about $200, but cant afford new gears and a posi. If I put new 3.73 gears in the rearend now, can I add a posi in a year or so while using the gears again? This is going to be a friday night cruiser and strip car, so I may even go with 4.11s.
Depending on what gears it has in it now, you may need a new chuck. The 2.56 posi was a cone type, it wont handle a lot of power and is virtually impossible to rebuild. That said, the rear itself is a good strong unit.
Ok I do not understand, or agree with this statement in your sentence?? The gear ratio DOES NOT determine the type of Limited slip GM offered in a rear. 10 bolt GM Corp 8.5 rears only differed with c-clip axles and Bolt in axles. -Ring and pinions all interchange -bearings in the center section cavity all interchange c-clip axled 8.5 corp rears MUST use posi units 410409 or 410408 or the Borg Warner (cone type) with side gear c-clip pockets. Bolt in axle 10 bolt 8.5 Corp rears can use ANY 8.5 posi units (725, 726, 410409, 410408, and BW units) with or with out side gear c-clip pockets. There were 2 different Yoke in the 10 bolt 8.5 in cars 1310 (Nova and early camaro 1970-1975 ish) and the M3R joint more common and stronger on all the rest of the rears even trucks 1/2 ton. Later the 1/2 ton 4x4 trucks did get a 1350 joint and can be retro fit to the car rear...(simple bolt on item) M3R should be strong enough for any application. Hope some of the info was helpful... Happy Holidays! Jim J D
ANDYSAM, If you do not have the money to start this project WAIT... things happen and you will need the extra dough. Your going to get yourself in a pickle if you have to send it out to get finished. Setting up rears cost money. You have a Muscle car and it all costs money now, Thanks to all the auction houses around the country and Rich people jacking up the prices on auction... Can not believe we use to pick up these cars for 100-500 all the time even 20 years ago Fuel crisis stuff always killed these cars prices for a while there....
Hmmm, the stock 10 bolt in my '71 had 2.56's and surprisingly enough, it had a cone style chuck and bolt in axles. Because the chuck was the 2 series, a ring gear spacer was required to make a 3.42/3.73 work on it. Am I mixing up 2 and 3 series carriers? There is a difference, no?
It was the CONE statement... 2.56 2.73 does not matter as far as Clutch or cone posi unit installed from the factory.... Had nothing to do with strength. That is what I was disagreeing about and the way your statement came across about 2.56 thing. Just trying to keep the facts factual not opinionated. Hope that clears that up for the threaders. Jim J D
