shift solenoids

there seem to be a fair amount of GTP owners at this site. some of you may have have a shift kit installed or even done some tranny work. the accumulator has the 1-2 and 2-3 piston/spring assy's inside. do they ever stick over time? causing delayed shifting or maybe even slow downshifts? I get a quick tranny buzz at about 10mph when i stop. maybe i asked the wrong question before. I did change the filter/fluid. looks clean. a tranny shop might be next. i hate to get taken for a ride by a shady shop.

I think my tranny is slow as sh*t with 18k on it. I don't know about this buzz thing you speak of. More details.
Jack

I installed the Thrasher shift kit on mine...I had to take out the accumulator and add spacers to the pistons and new and stronger 1-2 2-3 springs...My car shifts very crisp and sharp, I love it...maybe you should look into one...at least when you install it, you can check out the accum. etc to see if there's any kind of damage or wear with the springs, or worst of all, the pistons... (I love how the tires chirp when I hit second gear at about 53 mph!!)

There was a bulletin regarding "chips and sediment" internally on these transmissions. This would cause certain parts to stick at times, but I believe the symptoms were harsh 1-2 shifts, but I could be wrong. The only other thing that would make something like that stick is possibly poor or old and gummy trans fluid. Just an idea...

Are you positive Its the tranny buzzing. I had an alt. that buzzed a a low speed, The sounds all come from around the same place. Also there may be some power steering buzz at low speed. Keep us updated P'CHOP

my 96 seville has 2 shift solenoids that like to fail. they can be replaced without dropping the trans. I know the GP buzzes at 10mph. sometime it does, sometimes it does not. I am going to check the cat. heat shield. the trans guy i talked to said the shift solenoids are under the side cover. big pain to get too but less $ than pulling tranny. the seville has the 4T80E trans. supposed to be rock solid.

GM's got a bulletin for replacement of the Pulse Width Modulated Pressure Control Solenoid (or PWM PCS) on the 4t65e for any kind of crazy shiftying, harsh, or lazy. GM part# 10478146, I think, and it seems to work. gotta drop the engine/cradle assy enough to open the side cover on the drivers side, then I'm not sure which one exactly, but its on the side of the valve body. You'll need that and about 1L of dexronIII

yay, the PCS is $250 plus install. I love it when GM figures out they screwed up something and than makes the car owner pay to fix it.

I just had my 2000 GT in the shop today for this.. $580.00 est for parts and 6 hours labor. Gunna check other suppliers. Hopefully this fixes my shift issues and the max line pressure problem once the tranny gets up to operating temp.

as soon as I am fixed


pgp2000GT: Do you have an associated part num for the wiring harness and gasket. Dealership here wants to replace "P1811 code; Pressure control solenoid valve assy. Would need to replace valve assy wiring harness and gaasket and fluid."

The solenoid thru gmpartsdirect.com is $27 but I can't find a listed wiring harness for it any clues would be appreciated. I have a very trusted tranny place going to do the labour for much less than $580 USD for the complete job

no no no no no the PCS should only be $100.00 at MOST, $75 even