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Old 06-15-2010, 08:01 PM   #1
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Default Tranny Shifting Hard

Everytime I let one of my cars sit for like a week and drive it again it seems like the tranny shift hard. I owned several 3800 series 2 cars and it the same when I let them sit. Does this happen to anybody else, why does it happen, and are their any solutions to this?
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Old 06-15-2010, 08:10 PM   #2
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Does it shift harsh in both forward and reverse? If so a possible broken spring in the forward/reverse piston. Does it shift harsh in just 1-2, or 3-4?, does it happen all the time or just cold?
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Old 06-15-2010, 08:14 PM   #3
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It shifts hard while in driving when its shifting.It happens all year round and generally last for a day or two then it back to normal. It happen with my 99 regal gs, my 01 bonnie se, and now the same thing happens with my 01 auroura
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Old 06-15-2010, 08:24 PM   #4
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I would say the shift modulator needs a rebuild. Installing a shift kit generally corrects this problem, but it'* not the shift kit that'* fixing it. It'* the fact that the modulator is rebuilt. If your in need of one I have a rebuilt modulator with a shift kit installed. Just PM me for details.
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Old 06-15-2010, 09:07 PM   #5
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Maybe a trans. flush would help...the valvebodys maybe getting gunked up and need a flush might do the trick. I use the BG flush machine and it does wonders
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Old 06-15-2010, 09:48 PM   #6
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well when it sits for a while.. all the tranny fluid drips from the gears and such.
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Old 06-16-2010, 07:28 AM   #7
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The EPC soleniod is a very common issue with these tranmissions. Shift accumulators are not common at all. However putting in a shift kit does help with the pressure issues from the EPC and frequently helps the problem.
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Old 06-16-2010, 07:44 AM   #8
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Bill,

Does replacing the EPC solenoid require the pulling of the trans?
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Old 06-16-2010, 09:47 AM   #9
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The EPC is behind the side trans pan. The trans would need to be lowered. Replacing the EPC is a easy 30 second job, getting to the EPC will take a good part of the day.
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Old 06-16-2010, 02:06 PM   #10
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I didn't time it, but when Bonnevillian and I did his the other week, I think it took us about 2 hours to get the side pan off. We did all the soleniods and the 4th hub shaft (preventive maintenance in anything under 2003 production date)
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