Bad trans Mount???

[CCLB06]

Am I crazy or does it look like my transmission is leaning?
I had my truck on the rack getting my kryptonite idler support gusset getting welded in when I noticed this.
Would it be a bad driver side engine mount or bad transmission mount.

 

[Mike L.]

Time for engine and trans mounts.

 

[CCLB06]

Time for engine and trans mounts.

Are you positive those are the issue? I don’t believe my engine rocks when I give it fuel. I’ll have to double check to make sure though.

 

[gmduramax]

Are you positive those are the issue? I don’t believe my engine rocks when I give it fuel. I’ll have to double check to make sure though.

put it on a frame rack and make sure your frame is straight, also replace the lower control arm brace because that is bent and your trans cross member. It could just be the angle of the picture but something looks off

 

[CCLB06]

put it on a frame rack and make sure your frame is straight, also replace the lower control arm brace because that is bent and your trans cross member. It could just be the angle of the picture but something looks off

I bent the lower control arm brace ( put a jack on it like an idiot ). It is definitely leaning I’ll start with new trans mount and see what that does. The truck does have 280k miles so I’m sure that needs replaced. The truck has never been in an accident so I doubt the frame is bent.

 

[2004LB7]

tell that kid to get off his phone and give you a hand fixing your truck

 

[CCLB06]

Here’s a video of me testing to see if my engine mounts are bad. What do you guys think?

Lbz Duramax

youtube.com

 

[Bdsankey]

Here’s a video of me testing to see if my engine mounts are bad. What do you guys think?

Lbz Duramax

youtube.com

Assuming that is just hitting the throttle in neutral/park? There seems to be a decent amount of movement (more than I would like). Try putting it in gear and doing a brake stand and see what it does, that's where the issues usually are extremely obvious.

 

[CCLB06]

Assuming that is just hitting the throttle in neutral/park? There seems to be a decent amount of movement (more than I would like). Try putting it in gear and doing a brake stand and see what it does, that's where the issues usually are extremely obvious.

Sorry I should have mentioned this was done in Drive while standing on the brakes

 

[Chevy1925]

boost it up harder

a trans mount is not going to fix that lean but ill bet is shot if you put decent miles on it with that much lean. Your driver side mount is shot and you may have metal mount issues as well. there are 2 very long bolts that hold the bottom motor mount adapter plate to the frame. make sure those are there and tight. i would mock up a new engine mount in the truck, take weight off and see if it fixes the lean. if it doesnt, you need to look much harder at the engine mount at the frame.

 

[CCLB06]

boost it up harder

a trans mount is not going to fix that lean but ill bet is shot if you put decent miles on it with that much lean. Your driver side mount is shot and you may have metal mount issues as well. there are 2 very long bolts that hold the bottom motor mount adapter plate to the frame. make sure those are there and tight. i would mock up a new engine mount in the truck, take weight off and see if it fixes the lean. if it doesnt, you need to look much harder at the engine mount at the frame.

I don’t doubt the engine mounts are wore out. The truck has 280k miles.What leads you to believe I have metal mount issues?

 

[Chevy1925]

I don’t doubt the engine mounts are wore out. The truck has 280k miles.What leads you to believe I have metal mount issues?

A. im not there to inspect it
B. thats a shit load of lean and a bad motor mount usually doesnt cause lean, just clunking from the engine moving. if the mount is missing a bunch of rubber, that can explain it.
C. you put a motor mount in and still has the lean, you will be right back in there again.

covering all the bases as all we can do is go off the info you provide.

 

[Bdsankey]

I don’t doubt the engine mounts are wore out. The truck has 280k miles.What leads you to believe I have metal mount issues?

I've most certainly seen motor mounts bad with less miles. Miles doesn't mean anything. Runtime, usage, storage environment etc all effect the rate at which the rubber deteriorates. You have a ton of motor movement, that comes from a bad motor mount or a loose motor mount (hardware gone type loose).


Not to sound rude, you came to a forum to seek knowledge and then immediately turn around and pass it off as false.

 

[CCLB06]

A. im not there to inspect it
B. thats a shit load of lean and a bad motor mount usually doesnt cause lean, just clunking from the engine moving. if the mount is missing a bunch of rubber, that can explain it.
C. you put a motor mount in and still has the lean, you will be right back in there again.

covering all the bases as all we can do is go off the info you provide.

i understand! I guess a starting point would be to inspect the mounts and the mounting points of the frame.

Are these trucks known for busting the motor mounts on the frame side? As far as I am aware the truck has never been in an accident.

 

[Chevy1925]

i understand! I guess a starting point would be to inspect the mounts and the mounting points of the frame.

Are these trucks known for busting the motor mounts on the frame side? As far as I am aware the truck has never been in an accident.

no but those bolts i warned you about have been known to come loose and who knows what other damage may be there. it doesnt hurt to inspect.

 

[CCLB06]

no but those bolts i warned you about have been known to come loose and who knows what other damage may be there. it doesnt hurt to inspect.

Alright I’ll check them out. On a scale of 1-10, how difficult are they to replace? I’m pretty mechanically inclined so I try to do all of the work I can myself. I have the necessary tools to do the job besides and engine hoist.

Any tips you can give me would be much appreciated!

 

[Mike L.]

They're certainly not fun.

 

[CCLB06]

They're certainly not fun.

Oh I’m sure there not. However they cannot be that difficult I hope.

 

[Chevy1925]

a good chunk of wood between a jack and the engine midplate will lift the engine high enough without damaging anything. then its a matter of pulling the inner fender, pulling the steering shaft, intercooler tube and maybe a few other things to get to the mount. Then you have to fight the 3 bolts that hold the mount to the frame adapter. might need heat on them as the red loctite is pretty damn strong on those (speially if you have rust issues) and ive personally broke a few bolts off removing them (in a non rust belt state).

 

[CCLB06]

a good chunk of wood between a jack and the engine midplate will lift the engine high enough without damaging anything. then its a matter of pulling the inner fender, pulling the steering shaft, intercooler tube and maybe a few other things to get to the mount. Then you have to fight the 3 bolts that hold the mount to the frame adapter. might need heat on them as the red loctite is pretty damn strong on those (speially if you have rust issues) and ive personally broke a few bolts off removing them (in a non rust belt state).

Same procedure for the passenger side too? Which side is easier? I’ll be doing both sides regardless, I’m thinking the merchant automotive mounts as well.