The largest community of 1978-1988 General Motors G-Body cars. Chevrolet Malibu, El Camino, Monte Carlo; Oldsmobile Cutlass, 442, Hurst/Olds; Buick Regal, Century, T-Type, Grand National; Pontiac Grand Am, Grand Prix, LeMans, Bonneville; GMC Caballero
Get the GBodyForum e-mail newsletter!, Contests, Events, Deals, Forum News and More!
GBodyForum Supporting Vendor

Rear End HELP

User avatar
442Jayp
G Body Guru
 
Posts: 298
Joined: Thu Nov 11, 2010 11:10 pm

Rear End HELP

Postby 442Jayp on Wed Dec 01, 2010 1:38 am

I am about to buy a posi and 3.73 gears for my 1984 Cutlass Supreme and wanted to kno can anyone tell me the specs on a stock cutlass rear end that has no posi..want to make sure the gears and posi will fit my stock rear end
One Stock Cutlass
Image

User avatar
STL84Calais
Master Mechanic
 
Posts: 198
Joined: Thu Feb 05, 2009 11:54 pm

Re: Rear End HELP

Postby STL84Calais on Wed Dec 01, 2010 4:33 am

Just make sure you find them to fit a GM 7.5in rear end.
1984 Olds Cutlass Calais
Soon to be BTR/Olds 496 stroker. Shooting for 650HP N/A!
Build Thread - http://gbodyforum.com/viewtopic.php?f=10&t=11692
2006 Ford Crown Vic P71 - Bolt ons.
1984 Ford Bronco II - Camping and trail rig!
ImageImage

User avatar
442Jayp
G Body Guru
 
Posts: 298
Joined: Thu Nov 11, 2010 11:10 pm

Re: Rear End HELP

Postby 442Jayp on Wed Dec 01, 2010 11:22 am

ok i will be calling back and asking questions
One Stock Cutlass
Image

Kris_84elky
Master Mechanic
 
Posts: 127
Joined: Wed Nov 10, 2010 11:41 pm

Re: Rear End HELP

Postby Kris_84elky on Wed Dec 01, 2010 11:40 am

Well your going to need a posi carrier and gears that fit the 7.5 housing. I believe the 7.625 carriers and gears also fit but will require different axles because the 7.625 carriers have a different spline count for the axles. But if your going with a 7.5 carrier/gear set just make sure it uses the same spline count as your axles. Also make sure the carrier is the correct series for the gear set your getting. I believe 3.73 gears require a 3 series posi carrier. But if for some reason you can't get a 3 series carrier they sell spacer kits for the gears.

User avatar
442Jayp
G Body Guru
 
Posts: 298
Joined: Thu Nov 11, 2010 11:10 pm

Re: Rear End HELP

Postby 442Jayp on Wed Dec 01, 2010 11:47 am

Kris_84elky wrote:Well your going to need a posi carrier and gears that fit the 7.5 housing. I believe the 7.625 carriers and gears also fit but will require different axles because the 7.625 carriers have a different spline count for the axles. But if your going with a 7.5 carrier/gear set just make sure it uses the same spline count as your axles. Also make sure the carrier is the correct series for the gear set your getting. I believe 3.73 gears require a 3 series posi carrier. But if for some reason you can't get a 3 series carrier they sell spacer kits for the gears.


ok now how do i check the spline count...i dont kno anything about rear ends
One Stock Cutlass
Image

User avatar
High Roller
Master Mechanic
 
Posts: 183
Joined: Tue Aug 25, 2009 5:43 pm
Location: Cowtown USA, MN

Re: Rear End HELP

Postby High Roller on Wed Dec 01, 2010 8:57 pm

The '84 Cutlass came with a 7.5" rear, and 26 spline axles.
Eaton Differential #19663-010 $520
Moser axles #A102602 $245
Moser #7105 Girdle cover $160 is also good idea, and weld the tubes.
MSRA #9615
NAOC #4962
OCA #023589
1954 98 Holiday Deluxe HT
1973 GMC Sierra 3/4-Ton Tow Truck
1972 442
1973 442
1977 442's (2)
1983 Hurst/Olds T-Tops #1536
1985 442
1986 Cutlass Supreme Brougham
1989 Cutlass Supreme International
Image

Kris_84elky
Master Mechanic
 
Posts: 127
Joined: Wed Nov 10, 2010 11:41 pm

Re: Rear End HELP

Postby Kris_84elky on Wed Dec 01, 2010 9:13 pm

To find the spline count you just count how many splines are on the end of the axle where it slides into the carrier. If they are the stock axles they are 26 spline but someone could of changed them. Also I forgot to mention that the pinion gear has splines on it too that match up with the drive shaft yoke. But if all the parts on your rear end are stock, then the pinion gear from the gear set should have the same spline as your yoke. Sorry if I am confusing you but really all you have to get is a 7.5 gear set and a 7.5 carrier that matches your axle spline like STL84Calais said.

User avatar
pontiacgp
Royal Smart Person
 
Posts: 12971
Joined: Fri Mar 31, 2006 2:30 pm

Re: Rear End HELP

Postby pontiacgp on Wed Dec 01, 2010 9:15 pm

when you get the carrier and gears see if they have the backlash shims attached to the carrier so it'll be easier to set it up...if the bearing on the pinion is in good shape the shim for the pinion height should be good to install as is, if you do have to change the bearing do a mock up fit to check the shim on the pinion to make sure it's right...nearly all of the pinions set up in a diff will be the proper set up for another diff...and you'll want to install a new crush bushing

I have to ask...how long does to take you to put gas in that car?
Image

User avatar
442Jayp
G Body Guru
 
Posts: 298
Joined: Thu Nov 11, 2010 11:10 pm

Re: Rear End HELP

Postby 442Jayp on Wed Dec 01, 2010 9:36 pm

pontiacgp wrote:when you get the carrier and gears see if they have the backlash shims attached to the carrier so it'll be easier to set it up...if the bearing on the pinion is in good shape the shim for the pinion height should be good to install as is, if you do have to change the bearing do a mock up fit to check the shim on the pinion to make sure it's right...nearly all of the pinions set up in a diff will be the proper set up for another diff...and you'll want to install a new crush bushing

I have to ask...how long does to take you to put gas in that car?


feels like i be there for about 10 mins
One Stock Cutlass
Image


Return to Oldsmobile Cutlass / 442 / Hurst/Olds

Who is online

Users browsing this forum: No registered users