1968 31 Spline Olds Posi w 3:91 gears
#1
1968 31 Spline Olds Posi w 3:91 gears
Hello All,
I recently picked up a nice Olds 31 spline posi unit carrier w 3:91 gears from a buddy c/w the 31 spline axles. My question is....can I use these pieces in any 1968 Olds Cutlass type O rear end or do I need to find a specific rear end assembly that will accommodate this carrier? Any assistance is much appreciated- thanks!
Brad
I recently picked up a nice Olds 31 spline posi unit carrier w 3:91 gears from a buddy c/w the 31 spline axles. My question is....can I use these pieces in any 1968 Olds Cutlass type O rear end or do I need to find a specific rear end assembly that will accommodate this carrier? Any assistance is much appreciated- thanks!
Brad
#2
You can install that carrier in a 28-spline housing. You will need carrier bearings #LM102949,and bearing races #LM102911. Then you will need 31-spline axles,which can be made by Moser or other companies.
#3
31 spline rear type 'O'
The normal bearings used on the 672 case are A36 set which is the same as 12 bolt chevy...Brian is using the spool bearings for the 8.5 and or eaton bearing set-up which has the larger inner diameter hub and still keeps the outer diameter diameter to fit into the carrier saddle of most ten bolt GM rears. These bearing change the pitch fo the bearing slightly and are more smaller diameter barrel bearings - that is how they can do it.
remember to get that pattern right take your time and shim it correctly do not waste the gears as they are getting hard to find these days.
Jim
JD
#7
The bearings are usually on the shelf,but the races might need to be ordered. The races you need are LM102911. Do NOT confuse this with the LM102910,which is usually in the shelf,but narrower,and will not work.
If you have the original 31-spline axles,then you will need to use a 67-69 housing,that uses the same RW507CR axle bearing.It sounds like you are using another 68 housing,so you're good there.
If you have the original 31-spline axles,then you will need to use a 67-69 housing,that uses the same RW507CR axle bearing.It sounds like you are using another 68 housing,so you're good there.
#8
Thanks Brian. Yes the axles given to me are the GM 31 spline taken from a 68' parts car many yrs ago. I believe the rear end housing that I have is a 28 spline unit taken from a 68' Cutlass S. Are there any serial numbers or markings that I should look for on the outside of the rear end housing that will confirm it is a 68' or 69' rear end?
Brad
Brad
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