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Old 10-21-2009, 03:27 PM   #1
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Default 2005 SE Bonnie with shudder on 1-2 shift with light throttle

I am noticing a slight shudder on the 1-2 shift when accelerating under light throttle. I have found there was a service bulletin from GM that the clutch pack for that shift is to be replaced if a customer comes in with that complaint. The car has 175,000 easy highway miles put on by a traveling sales man. I don't know the service history, but the rest of the car is spotless, and purrrs like a kitty.

So...first off I will do a tranny fluid and filter change during the next oil change.

Any suggestions on a tranny fluid that might help with this condition? Thinking Valvoline Maxlife for cars with 75,000+ miles.

Also thinking of adding some Lubegard Red. This is a highly respected auto tranny additive...and I have used it before.

Is it possible to just adjust the clutchpack? How?

Any other ideas?

Thanks,
DH
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Old 10-21-2009, 04:19 PM   #2
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If there is a valid SB on the problem, I would take it to a dealer and see what or if it can be honored. If not, then you can move ahead with other plans.

Does the tranny fluid smell burned or is their the appearance of small metal flakes suspended in the oil? That would be a tell tale sign that the tranny is in need of some love and care. However; a fluid and filter change can often make a huge difference.

Use the manufacturers recommended fluid which I believe is Dexron III or IV for your year of car. Change the filter as well.

You won't find any of the staff here sold on or whoring aftermarket oil or tranny fluid additives though.
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Old 10-21-2009, 09:56 PM   #3
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Probably worth taking a look at the mounts to,,,,, I have seen them bad with a shudder complaint
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Old 10-22-2009, 12:09 AM   #4
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Check all the trans mounts. The front drivers side mount can cause a shudder on shifts if it'* loose or broken.
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Old 11-17-2009, 03:32 PM   #5
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I dropped the pan and replaced the fluid. Old fluid was in fine shape, and there was nothing bad in the pan...all looked good from the other 10+ tranny fluid changes I have done. I still have the 1-2 shift shudder though. Anybody think putting a shift kit in to quicken the 1-2 shift might help? It only happens under light throttle, and light loads...and disappears under heavier acceleration, and quicker shifts. Thoughts???
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Old 11-17-2009, 04:09 PM   #6
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I installed the shift kit because of a shudder that was getting very bad. Also replaced the fluid with Dexron VI. Transmission has gotten better over the last 10k miles. Very glad I did it. Because the more I drove, the better the tranny shifted (along with almost no notice of shutter) I think the Dexron VI fluid over time has somehow helped clean/ loosen something in the tranny. I used the Castrol labeled Dexron VI.
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Old 11-17-2009, 04:26 PM   #7
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A shift kit may help. however, simply taking the shift modulator apart and cleaning it and inspecting the O rings may also help.
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Old 11-17-2009, 04:28 PM   #8
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Quote:
Originally Posted by Danthurs View Post
A shift kit may help. however, simply taking the shift modulator apart and cleaning it and inspecting the O rings may also help.

Any chance to get a "how to" or any direction on this?
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Old 11-17-2009, 04:32 PM   #9
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I have a write up on just about everything. https://www.gmforum.com/t278802/
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