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-   -   bad shifts (https://www.gmforum.com/2000-2005-90/bad-shifts-224933/)

bonnevillemac 11-14-2005 12:00 AM

bad shifts
 
Yeah so anyway, if I am going up even just a small incline, at 55 the car jerks like it is wanting to shift. It's almost like the tranny can't make up its mind. I have been instigating the problem to see if I can figure it out. No luck. It doesn't do it at any other time while driving. Also, if I give it more gas it goes ahead and shifts and it's alright.

Have I got a bad tranny or what.

Signed,

Needin' help

Chad V 11-14-2005 12:02 AM

Might be the clutch pack. Sometimes those go. I used to have a 99 Blazer, and the 3-4 CP went out twice in the almost 100k I put on it. The gearheads will chime in soon.

sonoma_zr2 11-14-2005 12:05 AM

sounds like plugs and/or wires also

markwb 11-14-2005 06:37 AM

Re: bad shifts
 
Quote:

Originally Posted by bonnevillemac
if I am going up even just a small incline, at 55 the car jerks like it is wanting to shift. It's almost like the tranny can't make up its mind.

Those symptoms indicate a possible TCC problem, or valve body fault. .02

bonnevillemac 11-14-2005 11:23 AM

what is TCC fault??

and valve body also


how hard are they to fix

BillBoost37 11-14-2005 11:41 AM

Quote:

Originally Posted by bonnevillemac
what is TCC fault??

and valve body also


how hard are they to fix

TCC requires the trans to be out of the car. Both are best fixed by professional trans people.

corvettecrazy 11-14-2005 11:58 AM

are you throwing a CEL?? if it was plugs and wires it would be a misfire which should throw a light.

my guess would have been plugs/wires or the TCC.

markwb 11-14-2005 06:04 PM

Quote:

Originally Posted by bonnevillemac
what is TCC fault??

and valve body also


how hard are they to fix

TCC - Torque Converter Clutch, when the TCC is applied after vehicle conditions are met, the torque convereter is locked in synchronization with the engine. There is a very very small amount of slippage allowed though. This is all controlled by the PCM.
Valve Body - Internal to the transmission, it has to do with some of the control of TCC. I think it can be replaced by removing transmission side cover-transmission installed. You really should take it to a GM or reputable transmission service. They can put the tech II scan tool on and actually control TCC & force into the TCC apply, or engage mode to assist in troubleshooting your particular problem. But rule out the ign side first, check plugs & wires.

bonnevillemac 11-15-2005 12:39 AM

okay thanks gang, I'll cruise up to the GM dealer tomorrow, and see what they come up with.

Thanks again

Tim

kcusscam 11-16-2005 09:31 PM

Had the same exact problem, turn out to be a presure control something or another.

Jeremy


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