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Replacing Transmission Mount

svaneld
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svaneld Enthusiast

svaneld

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I need to replace my transmission mount on my 2005 GMC Sierra SLE 1500 4x4. Could I get some tips or basically the how to for this? I was also wondering if I need to even jack up the truck or if I can use a floor jack and just lift the transmission enough to remove the old mount and add the new. Any help is appreciated. Thanks

nickvrebel Senior Enthusiast

nickvrebel

Posted
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if you can fit under the truck you don't need to jack it up, you will be able to just jack up the transmission like you suspect. there's really not much to it, just take out the bolts, support transmission with floor jack, swap mounts and reverse to install

svaneld Enthusiast

svaneld

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if you can fit under the truck you don't need to jack it up, you will be able to just jack up the transmission like you suspect. there's really not much to it, just take out the bolts, support transmission with floor jack, swap mounts and reverse to install

 

 

Thanks Nick,

 

You ever here of a cracked or warn transmission mount making a pop or clunk sound when starting from a stop or coming to a stop? It also makes the sound over bumps when I am going below 20 mph. When I am traveling over 20 mph I never here the sound. I can make the sound when I hold the brake and hit the gas but I have to drive around the block and stop again to get it to repeat. The other day I was under my truck and pushed up on the transmission and heard the exact sound in that mount. It just seems to me when I am driving that the sound is further in front not basically direclty under me. but when I am outside the truck it seems to come from that area. I am just wondering if It could be the transmission mount and maybe a motor mount as well. Sorry I am just thinking out loud. I am going to replace the transmisssion mount this weekend and will see if that gets it done. Thanks for the reply.

nickvrebel Senior Enthusiast

nickvrebel

Posted
Posted

it's very possible that the sound is coming from the transmission mount. I've seen a completely blown trans mount on a Firebird cause the catalytic converters to slap the underside of the body on the car, keep in mind that the whole motor and transmission assembly is held to the frame by three mounting points, two motor mounts and one transmission mount. The motor mounts limit the side to side movement of the assembly. With a bad transmission mount the motor and transmission and rock forward causing various components to make contact with things you wouldn't think they normally could. The transmission or exhaust could be making contact with the underside of the truck body.

Willshire Enthusiast

Willshire

Posted
Posted

Are the tranny mounts hydraulic on newer trucks? Or perhaps just a monday or a friday mount? Once the oil leaks from a hydraulic mount its done.

nickvrebel Senior Enthusiast

nickvrebel

Posted
Posted

I know it's a rubber mount on the trucks through at least the end of the GMT800, I don't know of any changes for the GMT900 (haven't looked personally)

svaneld Enthusiast

svaneld

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Got my transmission mount replaced and it fixed my problem. I could not see where the old one was damaged or why it was making the noise though. Took me about 2 hours becuase 1 of the bolts is a turd to get to but for the most part very easy. Thanks for the help.

  • 5 years later...
Shane Carney New Member

Shane Carney

Posted
Posted

I know it's been awhile since this thread, but I am having a similar problem that just seemed to have gotten a little worse. Enough to where I need to do something about it before I tear something up. I feel a loud vibration almost like pure bass coming from the truck when I stop in gear. It goes away when I accelerate and put in park. I am wondering if this is transmission mount related or more of a motor mount issue. Any advice or comments would be appreciated. I'm going to at least take a look this weekend and be sure everything is tight. Thanks in advance for any tips/advice! Shane

  • 5 years later...
Ashton Sanders New Member

Ashton Sanders

Posted
Posted

10 years later, I’ve got a bit of the same situation. My 03 serria makes this club king noise when I start to drive, or when I come to a stop, my transmission seems to shift twice in first to second gear, I’m hoping it’s the transmission mount. How many mounts do you need? 

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