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#1502323 Sat May 27 2023 12:15 AM
Joined: Apr 2017
Posts: 44
Well.... I put on 31's and a new carb. did some burnouts and broke something. Imagine that! I'm not well versed in GM 4X4 from the '70. Not sure but the case looks divorced to me. The '74 crossmember was used and has a casting that seems to contain a shaft. I always assumed it was an open shaft. problem is under power the drivetrain seems fine. when it "relaxes" or coast it has a horrible bad sound. The throw out bearing made some noise once I put it back on the road after it sat 10. I don't think it's the problem. I'm assuming it's a chain drive case. It's behind a 4 speed granny gear trans.

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Joined: Jun 2011
Posts: 4,977
Picture of drivetrain would help.


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Joined: Sep 2009
Posts: 3,698
Gearhead, Moderator for The Swap Meet and General Truck Talk

As your conversation has to do with a truck converted to a later drivetrian, your post has been moved to the HiPo Shop for further conversation and discussion to help you with your problem.

Am sure fellow Bolters with some experience with running such a later 4X4 drive train will chime in soon with helpful tips and info.



1951 Chevy 3 window 3100 (My Grandpa's hunting truck)
1966 Chevelle (Wife's Hot Rod)
2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998)
Com Fac Maint Lead Tech Retired (1998-2021)

Finally time to get to work on my Grandpa's (now mine) truck!
Joined: Jan 2019
Posts: 1,370
Herder of Cats, Goats, and Sheep (moderator)
I am a bit confused. What is your question?

From the Rocky Mountains?
Check in with the RM Bolters!

HiPo Forum Moderator

1958 Apache, long bed Fleetside, V8 w/SM420
Driveable but the rear axle needs work.

1959 Apache, long bed Fleetside that has been in the family for 25 years but in desperate need of love.

Moderated by  Fibonachu, KCMongo 

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