SV6 Transmission problems

bbtruck

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Hello all,
I just joined the forum. I own a 2005 Pontiac Montana SV6 2wd. Recently the van has been shifting hard. It likes to jerk at some points where at other points it likes to just shift but you can feel the thud under your feet of the shift. The transmission originally junked out at 98,000 miles so I had it replaced by GM still under warranty with a brand new one. The van now has 190,000 miles on it. I just changed the fluid and filter in the transmission last week. I put some lucas additive in it and it seemed to run fine for the past week. No jerks, no nothing. Now, today I drove all over and I came back home and it was fine. I went to the store and after going to leave from the store it started to do the thuds again. I have checked so much on the front end and am at a loss. The transmission fluid looked dark but not bad. No metal shavings in the pan and the magnets really had nothing on them in the pan. Any ideas? Sorry for such a long post.
 
I assume you have checked the fluid level to make sure the new pan gasket is not leaking. Beyond that it sounds like you are having a shift solenoid issue. You may want to have a local shop check it, make sure they have a ASE certified technican in transmissions.
 
Yeah, new gasket is fine and fluid is good. I was thinking that after poking around this forum? How hard is it for a DIYer to change that?
 
If you are good in mecanic, you can check the shift solénoïde your self. I check both of mine and it's easy if you have good tool and mecanic idea.

it's just bad that gm dont give shop manuel online free like kia do!
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Yeah, new gasket is fine and fluid is good. I was thinking that after poking around this forum? How hard is it for a DIYer to change that?

If you can change oil then you can change the gasket yourself. just have to add transmission fluid when done.
 
I'm having the same problem. Just started shifting hard out of no where
 
I'm having the same problem. Just started shifting hard out of no where

What year and how many miles ? Have you checked the fluid level , may be low? You can always change the fluid and filter to start with and see if that helps.
 
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