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2004 chevy trailblazer_ls_ext
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Discussion Starter · #1 ·
Hi - I have an 2004 Trailblazer EXT 5.3 V8 RWD automatic. The last few weeks my vehicle has been having issues while shifting. It high revs between gears and overall (especially accelerating from a stop) is very slow to switch into gears. If I press the gas to go quickly it high revs then eventually will go into gear . This has caused me to slowly accelerate and "take it easy" overall on the gas peddle. Fearing it could be a failing transmission I took it to the shop. after taking it for a test drive they determined my issue was "bad motor mounts causing my transmission to feel like it was slipping". The shop checked my transmission through and through and said replacing the 2 mounts and tranny mount would fix the odd shifting my tranny was doing. My fluids and overall tranny were fine. My question is, is this a common issue ? I have shopped the parts and found all 3 for under $200 shipped (FYI I am a guru at finding best discounts online). I have read all over the web (especially here) that this does and can happen and cause transmission issues and sometimes this leads to misdiagnosis of transmission repairs... So any advice is appreciated!
 

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2004 chevy trailblazer_ls_ext
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Discussion Starter · #3 ·
I did, both shops (trusted and years of use) have said the same thing. The alignment of my transmission is off due to the failed motor mounts. Because of the misalignment my transmission is not sitting where it is supposed to me. Both shops said this is an issue with quite a few trailblazers they have had in. I don't know if a third opinion is now needed or if I should just go ahead and replace them to avoid future issues
 

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2003 gmc envoy_slt
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OK, I don't know how "common" broken engine or transmission mounts are in our trucks, but I've driven and worked on lots of vehicles with broken mounts and I know what it's like to drive them.

The engine and transmission will kick around, but I wouldn't describe it as "If I press the gas to go quickly it high revs then eventually will go into gear".

If the mounts were bad, and you hit the gas quickly, you would hear a thump as the engine lifted and hit something and a slight lag before the truck moved out. If you heal the gas down it would shift at the appropriate time, without much rpm rise between gears.

Now, having said that, I'm not saying that your mounts are NOT bad, just saying I don't think, even if they are bad, that replacing them will fix what you are experiencing. I wouldn't want you to think that simply replacing the mounts is your fix. By the sounds of it you have a transmission problem.

If your fluid level is good, then you need to find a transmission shop with a good reputation. Find one that's been in business for years. Check the BBB for problems with the shop. Get a few opinions before you commit. A knowledgeable shop will have a good idea of what is happening and what needs to be done. It could be something as simple as having a bad solenoid replaced, but it could also mean that the transmission has to come out and come apart.
 

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2006 gmc trailblazer_ls
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^^^I agree with this. I cannot think of one way where bad motor mounts would cause a trans to do as you are describing. Sounds like a slipping trans to me. How does the fluid look/smell. Black ? Burnt?

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