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1985 gmc high sierra

nford824

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nford824 Enthusiast

nford824

Posted
Posted

hello, im new to this site and im trying to get my 85 gmc back on the road. Its a 6.2 diesel with a 700r4 transmision 4x4 all origional. The transmision case broke around the tailhousing so i need to get a new one, it didnt brake from impact or anything im guessing its a bad design or the driveshaft shaking around, and its had multiple transmision replacements in the past, more than it should so i dont want to make the same mistake and have to buy another one in a few years. Has anyone else had this problem? Should i switch to a diferent transmision? Are ther modifications i should do to fix the problem? Any input would be appreciated, thanks

  • 3 weeks later...
NitroCherokee Enthusiast

NitroCherokee

Posted
Posted

I have seen this happen on that era truck, usually it was caused by a bad u-joint, it doesn't take too much of that shaft vibrating just right to break the aluminum housing. I have seen it happen to TH350 and TH400 trans too

txab Senior Enthusiast

txab

Posted
Posted

Get the transmission rebuilt, driveline checked and balanced. Check your angles since you've got a 4x4 with I assume a lift on it

Squirrely Enthusiast

Squirrely

Posted
Posted

The transmission broke or the transfer case?

 

If you're running a 4x4, the transmission output doesn't connect to the driveshaft. It connects to the T-case.

  • 2 weeks later...

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