Rear Axel Info ?

[cutty651]

I Have A Question I Have Two Rear ends Both Out Of A Cutlass 81-87 Need To No Witch One Is Better And If The Gearz Have Been Changed. Hoping Its A Posi But I Know Nothing About them Looked Up The I.D Stamp On Them Both Are 7.5 and 1 the gear ratio is 2.41 and the other is 2.29 I Took The Cap Of The 2.41 Looks Like A Swap As U can See In The Pic The Bolts Inside Have A L On Them I Am Guessing That Is For Limited Slip Either Way I Want Posi And I Plan On Putting A Crate 350 Sb Chevy That Put"s Out 425Hrsp At The Most So Wat Are My Options I Was Thinking 3.73 gears or 4.10 Car Will Never See A Track Just Street Car Plus I Was Thinking Trying To Find A 8.5 Witch Prob Wont Happen Or Ordering A 9" Ford From Summit Also Read On Here I Could Swap From A 68 to 72 A Body Gm 12 Bolt Witch I Prob Wont Be Able To Find That 1 Either I Don"t Want To Spend Alot That"s Why I Was Hope I Could Just Beef Up The 7.5 The Body Is Off Frame So Changing Is Not A Prob Any Help Would Be Appreciated Thanks Oh And Adventually Plan On Changing To Disc Brakes If That Makes A Difference In The Decision Again Thanks

 

[CHRIS.O]

Those pics show an open one wheel peel diff. There is a fill plug on the differential, you remove it with a 3/8 extension.

 

[martin.ca]

Count the teeth on the Ring gear and count the teeth on the pinion. Divide bigger number by smaller number.

http://tech.oldsgmail.com/axle_useage_1982.php

Cheapest option is to get a new Ring & Pinion set, a used "posi" and a diff-case cover brace. As long as the axle's tolerances and bearing are in good nick, it should serve you okay. Usually the axle you have already is the cheaper option.

 

[cutty651]

ring and pinion can i go with 3.73 from summit and used posi what would i get that out of plus cover brace where i get that and thanks for the reply chris and martin God Knows I need It.

 

[CHRIS.O]

I would look for a rearend set up for a gbody and just buy the whole rear end. If you have never set up gears before you won't be able to do it unless you have a good mechanical aptitude and a few special tools. So again, I would just find a rearend that is complete that is what you want.

 

[cutty651]

Thanks Chris But I Don"t Think I Gonna Find Any G-Body Around Here That Aint Crushed Allready Or Kept For Restore Plus More Then Likely If I Do Find 1 Its Gonna Be The Same As What I got Plus Dont Want To Wait For Ever So Unless Their Is A Common Newer Car Or Sum Used Prob Wont Be Might Route Even Though I would Rather Go That Route If Its Cheaper And Easier And As Far As the Mechanical Part I Am Pretty Gd With Most And Plus Would Like To Know How Anyways Thats About The Only Thiing On The car I never done so myswell learn right plus i got 2 cars so i mess up i got another rear right lol but know thats wat the g-body forum is for and youtube and internet is for so i figure it out sooner then later so i am guessin i prob order from summit so any help on that route would be nice like i said thanks again much appreciated 😀

 

[cutty651]

http://fargo.craigslist.org/pts/3195697255.html Found This On Craigslist Will It Work Its Real Close To Me (This is a rearend from a 95 caprice. 3:08 gear ratio. Limited slip "posi" with Disc brakes and 4 3/4" lug bolt pattern. Hub to hub is 64", Spring mounts center to center are 35", Upper link mounts center to center are 11 1/2", and the lower link mounts center to center are 46".) ? ANY ONE KNOW BE APPRECIATED THANKS

 

[cutty651]

OR SHOULD I JUST GET THIS http://minneapolis.craigslist.org/ank/p ... 90378.html Up for sale is a 8.5 inch 3.90 ratio posi from a Buick grand national. It was rebuilt last year with new Richmond ring and pinion, yoke, bearings and seals. Only about 200 miles put on since then. Not rusted, good brakes and brake lines. New qmi full synthetic 75/140 fluid. Im looking for $1000 o.b.o. I AM NOT PARTING OUT A GRAND NATIONAL ITS 800 MORE BUT DIRECT FIT I AM ASSUMING WE ALL KNOW I WOULD RATHER SAVE 800 THOUGH SO ANY HELP WITCH IS BETTER ROUTE THANKS

 

[Peter]

The GN axle is your best bet and on top of that 1000 bucks for an 8.5 inch rear built up like that is a solid deal especially if you can haggle the seller down a bit.

 

[martin.ca]

http://minneapolis.craigslist.org/hnp/p ... 82638.html
"Rearend assembly with Richmond Gear 3.90-1 ring & pinion. Non-posi. Bearings, axles, seals, etc. all in good shape. 4.75" bolt pattern, bolt-in style axles. I believe this unit is from a 68-72 oldsmobile Cutlass/442. This axle was in my 66 GTO, works perfectly, and will fit most 64-72 mid size Pontiac, Buick, Oldsmobile, Chevrolet cars with coil springs. Would be a good replacement for the weaker chevy 8.2" rearend. 763*647*0901 "

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