please help tranny acting weird

[ryan88z]

Ok , got a 99 gtp. When im accelerating and it finally hits that last gear i think its a 4 speed. it will start shaking a little bit and i can see it on the tach as well. but if im accelerating hard it doesnt do it . just wandering if it is maybe a clutch or something in the tranny , i dont have allot of expeirence with automatics. any help will be great

thanks
ryan

[chrisb]

yes it has a four speed but fourth wouldnt come in till like 125 or so. if it shakes a bit it could be low on fluid mine was that way also it could be the clutches wearing out, a shift kit would help them last longer


opps i read that wrong disregard my post

[Trannyman95]

Correct me if I am reading into this wrong but are you trying to say that during normal acceleration, light or part throttle, when it shifts into 4th under this condition you notice the problem? Say around 40-55 mph and you see the tach bounce up and down a few hundred rpms?

[TDCRacing]

i was just going to ask you about this trannyman, mine does it also....in 3rd to i belive...but dont quote me on that i will have to double check.


it is almost like it is shudering...and it has gotten worse in the last week or 2...during hard acceleration the problem is not present.in any gear.


will anything help this tuning wise driving wise or maybe like shift kit wise? lol



I am also hearing almost like a belt squealing noise at idle and p/t and think it may be related to the trans...but im checking into that also...

[Trannyman95]

So is your problem the rpms consistantly bouncing up and down a few hundred rpm around 45+ mph? I need specific info on the problem to help out. If you do have a tuner then you can try raising up the Min TCC duty% a bit and also go into the pressure control solenoid Amperage tables and reduce the .5 amps and higher numbers by a few percent at a time. That will cause the line pressure to raise and can help overcome the problem also, IF it is lockup related.

[TDCRacing]

it is happening in 3rd and fourth...33 mph is the lowest it has happend and is less noticable in 3rd than in fourth...aprox 75 is the highest i have ever noticed it as of now.



as far as the rpm's bouncing up and down...i mostly notice it when i am at higher speeds...like around 60 on up with the cruise control on....then it will bounce up and down...and shudder a bit...then when i press on the gas and the engine bogs down a bit it shudders real bad.

max line pressure is already set at 96. forced motor current positive and negative is zeroed out on the 100 colum.


is that what you were talking about?



and as far as a ''few percent''...how much??? 3?

[ryan88z]

yes trannyman thats exactly what it does