Poly trans mount options?

[85 Jimmy]

Nothing has contacted the t-case that I know of. I also haven't dragged either of my driveshafts across anything.
I may just go with a generic poly mount, or if my local parts store has a rubber replacement I'll use that. I don't really want to spend a lot of money on a new mount when I plan on going with a doubler down the road. Not sure when that'll happen though.

 

[dyeager535]

Urethane is supposed to be impervious to oil, coolant, etc., which is one of it's major selling points for engine/trans mounts.

I've been running my poly mounts for years, no issues like this. No help I suppose.

 

[folkenheath]

Nothing has contacted the t-case that I know of. I also haven't dragged either of my driveshafts across anything.
I may just go with a generic poly mount, or if my local parts store has a rubber replacement I'll use that. I don't really want to spend a lot of money on a new mount when I plan on going with a doubler down the road. Not sure when that'll happen though.

I don't mean dragging your driveshaft, I meant if your driveshaft is too long and bottoms out with suspension travel it will push on your transfer case, and the only way to go is up.

 

[85 Jimmy]

It's not too long, but the angles are extreme and during heavy brakeing the ears of the driveshaft on the t-case side hit the slip yoke. Knowing that, I make an attempt to keep my self out of situations where I need to slam on the brakes.

 

[folkenheath]

That could be your problem right there. At that much angle, under power, the slip yoke may not slip, and then your driveshaft will push up on your trans. The problem might be solved by installing a SYE and then put the slip in the driveshaft where it doesn't have the friction of the angle pushing on it. I wonder what it would look like if you video the t-case and slip yoke under sudden acceleration.

However, if you are going doubler, you will solve the problem then.

 

[85 Jimmy]

I never thought about axle wrap during heavy acceleration. That is one thing that I don't try to avoid...

 

[natemc]

You should also inspect the aluminum for cracks. If you're pulling a poly mount about and contacting the body your whole drive train is moving to much.
My poly engine mounts don't move at all, period, zip, zilch, nada. My trans can be installed without blocking it up to get the jack out. That's why my case broke when I set it on a log.
That leads me to an idea. Did you weld your engine mount brackets to the frame? If you didn't weld them to the frame, the aftermarket crossmember will still allow flex.

 

[85 Jimmy]

I've looked the end of the transmission over for cracks and couldn't find any.

The engine mounts are not welded in, they are bolted in with grade 8 bolts, along with the crossmember.