M1028 Cracked Transmission Case

[MachoTime96]

Just found a crack in the rear of the Transmission case on my 1984 M1028. Thinking of replacing the entire thing.

Any videos, links, advise is appreciated, thank you in advance.

 

[MachoTime96]

 

[Mullaney]

View attachment 921390

.
Yessir, I believe you will need a replacement case.
Did you "dog" your truck, or was it already broken when you got it?

 

[MachoTime96]

Not sure was "dog" means but i dont believe it was broken when I got it. I drive it carefully on mostly pavement.

 

[Mullaney]

Not sure was "dog" means but i dont believe it was broken when I got it. I drive it carefully on mostly pavement.

.
Okay, what about the motor / transmission mounts? Are they in good shape? Generally speaking, a transmission will only get cracked if it is under a load (torque) and maybe the mounting was loose. I can't imagine it just sitting there and getting a crack in it.

 

[Barrman]

Fork lift loading to sell at auction has done that many time in the past.

 

[MachoTime96]

.
Okay, what about the motor / transmission mounts? Are they in good shape? Generally speaking, a transmission will only get cracked if it is under a load (torque) and maybe the mounting was loose. I can't imagine it just sitting there and getting a crack in it.

You may be on to something. I noticed my rear drive shaft was dented. The previous put a tire weight to offset the dent when it spins. This could be a factor. Ive yet to check the motor mounts. But ive never noticed them being worn.

 

[78bigten]

Last year my 1985 M1008 transmission had a crack at the rear of the case. The crack was on the top, close to where the transfer case mounts bolts to the transmission case.

I have owned the truck for close to ten years now. I don't off road it hard or tow much with it. It was my daily driver for the first four or five years I owned it. I did replace both the motor mounts and the transmission mounts when I first bought the truck.

I was lucky to find a transmission out of a CUCV in a junk yard a couple of hours away. The replacement transmission had HD cast into the bellhousing.

The transmission that came out of my M1008 did not have HD cast into the bellhousing. I believe the HD transmission case had reinforcements made to the rear of the transmission case, to help support the transfer case.

I can only guess that a previous owner had replaced the transmission before. And the weight of the transfer case cracked the transmission case.

 

[Curtisje]

Maybe you need the support rod for the transfercase? I don't know much about them but there is a thread on here about it.

NP 208 transfer case brace

Just want to point out again that I have yet to see something built in the last 20 years have anything remotely close to a torque rod on the tcase, never seen one on a Japanese import truck, nor anyone adding one aftermarket. As you probably already knew, early Jeeps had a simple setup that...

www.steelsoldiers.com

Good luck.