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Trans/Transfer Mount

BioHazard2222

BioHazard2222

Well-known member
Joined
Mar 30, 2021
Member Number
3734
Messages
65
Loc
Oregon
Just thought I would get your guys take on this mount to mount my TH400 and my Atlas.
The LS is Poly mounted, and the trans mount (Red Circle) is poly, and then poly between the mounting bracket and the frame is poly (Red Circle), with the tail of the Atlas using a clamp style mount (Green Circle). It seems with the poly between the mounting assembly and the frame being poly, it should be all good. Just thought I would get your thoughts. Just don't want to miss something, or create a issue I didn't see.

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The mount you built should probably attach solidly to both trans and Tcase or be isolated from both. Your current setup allows movement on one end and restricts it on another.

Poly is stiff, so It may not actually matter. Easy enough to replace the trans mount with a piece of square tube or something if you decide to solid mount it.

Edit: this is with the understanding that the lower poly mounts will actually be handling the drivetrain movement in either scenario.
 
Depending on how rigid the motor mounts and chassis is, it looks like it could lead to a busted transmission case.
 
fvs said:
Depending on how rigid the motor mounts and chassis is, it looks like it could lead to a busted transmission case.
Click to expand...
You thinking the transmission case would break because? I’m trying to fix the problem if there is one… The chassis is pretty ridged, all 2” DOM… open to suggestions
 
An assembly should have all mounts be the same. That trans/case cradle needs the trans mount solid mounted too so it will become a solid part of the powertrain assembly. Then the poly engine mounts and poly cradle mounts will work together.

As it sits now, I think the rear output housing on the Atlas will crack.
 
Last edited:
mobil1syn said:
how is the motor mounted
Click to expand...
I have poly bushings between frame and motor, the mounts between bushing and frame are just two 1/4” tabs right now, but will be reinforced when I build shock mounts, so they will be at least boxed in.
 
BioHazard2222 said:
I have poly bushings between frame and motor, the mounts between bushing and frame are just two 1/4” tabs right now, but will be reinforced when I build shock mounts, so they will be at least boxed in.
Click to expand...
solid mount the entire drivetrain.
 
So it sounds like get rid of poly at transmission and go solid there, then you would have the poly bushings between mount assy and frame along with the poly at the motor end, so everything between drivetrain and frame is isolated with poly. Also add bracing in the mounting cradle assy and probably the mounting tabs to the frame. Then it sounds like it may work ok?
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You get motor/spinning vibrations from poly anyhow. There is a massive difference from rubber to poly.

Ive never driven anything at speed with solids.

I dont see anything wrong with the poly trans mount but no reason not to just make a solid block/bracket
 
BioHazard2222 said:
You thinking the transmission case would break because? I’m trying to fix the problem if there is one… The chassis is pretty ridged, all 2” DOM… open to suggestions
Click to expand...
I’ve seen quite a few instances where an overly rigid tcase/trans mount led to a busted transmission case. Either the motor was able to flex in its mounts or the chassis had more flex than anticipated. I’m not saying you’ll have those problems but it’s just something to consider. Typically I would orient the lower mount 90 degrees so it would run parallel to the driveshaft.
 
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