I want to install a Pontiac judge 12 bolt in my 72 GS will it fit.?Is the drive shaft in the Buick GS gonna be to long? Or will I be OK ?
If you have the original 1972 10 bolt 8.5 in your 72 GS the drive shaft with the swap of a 12 bolt CHEVY rear will need to be LENGTHENED...not shortened. 10 bolt 8.5 out of all GM A-body rears has the longest pinion shaft. almost all other a-body rears are interchangeable with only a minor u-joint swap at the most. Jim J D
Will the Neapco 3-3130 give me the length that I need ? Or do I need a drive shaft? I thought that because the 12 bolt was B. O. P. That it would be ok. Jim are you saying I need a dive shaft?
Jim could you give me the Measurement. I will get this driveshaft extended. I’m sure That number gets thrown around a lot. Or would I be better off with a new driveshaft
You have to call your driveline shop your going to use and ask them how they want it measure...THIS IS the only safe way to get a driveshaft built. Besides i do not know the driveshaft length...lol. Nor would it matter if you want it done right. Jim J D
As Jim said measure how the shop your using want and have a new one made. I cant see any safe way to extend a shaft. I use a place just outside of Columbus Ohio called custom clutch and joint. Never had a safe they built me fail never been over 300 but I always provide then the slip yoke I'm using and use it to get the measurement. Mike is super to deal with. I'm sure they will ship to where ever. 614-850-0337
Ok Jim you are correct talk to a driveline guy here in Pgh. Thank you very much for your time. Thanks Ben
One option is to use a trans yoke,with a longer barrel,but make sure it is splined to the end. It is not a cure-all/end-all solution,but it does work occasionally,depending on how much length you are trying to make up. I have also put an 8.5” yoke on a 12-bolt Chevy,using a different seal,and then you can retain your existing 3R u-joint. A combination of both could do it too.
You will need to do something about the drivers side upper control arm unless you get the one from the 12-bolt. The 10-bolt arm is too big in one are and "can" rub on the housing, cutting into it. You can just clearance the 10-bolt control arm or buy the kit where you weld an etra reinforcement piece like the factory did. https://www.lever-family-racing.com...0-bolt-12-bolt-difference/create-12-bolt-arms