I am having trouble finding information on this. Hope you can help.
This is what I think I have. 12 bolt cover w/10 bolt / 8.2. / 28 spline. This is from research. I have not pulled the cover off yet to verify.
I would like to change to posi 3.55 or 3.73 but I can't find anything. Is there anything out there that will work and if so what or should I just just start over. It is under my 66 GTO.
402227 olds rear end from 1970
Re: 402227 olds rear end from 1970
That is a 12 bolt olds alright
It is 8.4 ring gear diameter
they came in 28 spline from 1967-1970 and 31 spline from 1967-1968 only
Only aftermarket gears available are 3.42 and 3.90 sometimes you can still find 4.10
ALL the rest are good used gears ratios are as follows
2.56 2.78 2 series open/ posi
3.08 3.23 3 series open / posi
3.42 3.90 4.33 4.66 5.00 posi / 3.42 is the only ratio that came in open
We have NEW and reconditioned posi units for these 12 bolt olds rears with 28 or 31 spline
we have used 3.08 2.78 2.56 gears We have NEW 3.42, 3.90 and 4.10 gears
If you check our differential ID section out of the forum it will have all the info on a the 12 bolt olds and rear cover picture to help ID this rear PLUS all the bearings used in the rear diff also.
Jim
It is 8.4 ring gear diameter
they came in 28 spline from 1967-1970 and 31 spline from 1967-1968 only
Only aftermarket gears available are 3.42 and 3.90 sometimes you can still find 4.10
ALL the rest are good used gears ratios are as follows
2.56 2.78 2 series open/ posi
3.08 3.23 3 series open / posi
3.42 3.90 4.33 4.66 5.00 posi / 3.42 is the only ratio that came in open
We have NEW and reconditioned posi units for these 12 bolt olds rears with 28 or 31 spline
we have used 3.08 2.78 2.56 gears We have NEW 3.42, 3.90 and 4.10 gears
If you check our differential ID section out of the forum it will have all the info on a the 12 bolt olds and rear cover picture to help ID this rear PLUS all the bearings used in the rear diff also.
Jim
J D Race
Re: 402227 olds rear end from 1970
Yeah I thought I had a bit of an oddball one. I clicked on the Olds 8.4 section and got this error:
Not Found
The requested URL /Rear_ID/12b84Olds.htm was not found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
3.42 sounds good to me!
Not Found
The requested URL /Rear_ID/12b84Olds.htm was not found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
3.42 sounds good to me!
Re: 402227 olds rear end from 1970
I think it is fixed now. Thanks for the heads up...sometimes we do not know about stuff till we hear it from you the user. Jim
J D Race