3800 97 GTP trans problem

[99PONTIACGP]

So, i have my project GTP that I put the motor in and everything was looking good. The motor started up and nothing was leaking. This is an aftermarket trans if that means anything; the car goes in reverse and drive BUT when Im driving it, it wont shift out of 1st gear. Is there maybe something that needs to be connected? Is the trans bad? Is there anything I can test? HELP!

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[TommyGloves]

Sounds like a broken band. What happens if you let it coast up to 15-17mph? Does it shift into second?

 

[99PONTIACGP]

No, nothing happens. The RPM's just keep getting higher. I even tried starting all the way down at 1 and manually putting it into 2 on the shifter and it still didnt shift and from what I under stand when my brother drove it, when you get on it, it dies out.

 

[DarkShadow]

Just ruling it out..... Have you scanned for codes? You sure all your grounds are connected? etc........

 

[bikrboy128]

does it work if you shift manually?

 

[red gtx]

does it work if you shift manually?

He said he did a few posts up......it's prob the clutches/gears.

 

[GraFFix]

No its not the trans...this was my car. it was my DD up until the day the engine blew. The trans was the best thing on the car it was built and was only about a year and a half old.

Like I told him already, its most likely a vacuum line or possibly a PCM issue. I had it happen to me once before messing around under the hood. knocked a vacuum line off and the trans wouldnt shift. The car is a 97 and hes using a newer engine in it which had a different vacuum setup, he is also using my old 97 PCM because its been programed with the 3.29 gears and stall. But the engine is a newer engine so im not sure if that is making a difference either. Maybe the codes are different and the pcm isnt getting the info to change gears....maybe the speed sensor is different. could be alot of things now that I think of it.

 

[DarkShadow]

Ohh i forgot about a trans problem i had before when a fuse blew, check all the fuses and aux engine fuse blew on mine and the car wouldnt move in gear.....

 

[M@]

vac line wouldn't do that....

Could be a TPS issue, or a shift solenoid, those are probably most likely culprits.

 

[02BlueGT]

vac line wouldn't do that....

Could be a TPS issue, or a shift solenoid, those are probably most likely culprits.

some 97's had a vacuum diaphragm on the front, if that isn't connected it will cause issues.....IIRC, it will be pressure issues.....

If it helps, when I unplug my TPS the car doesn't shift out of 1st, try a different TPS

 

[M@]

some 97's had a vacuum diaphragm on the front, if that isn't connected it will cause issues.....IIRC, it will be pressure issues.....

If it helps, when I unplug my TPS the car doesn't shift out of 1st, try a different TPS

That's only the case on 97 GT's and SE's that had the 4T60E which is vacuum modulated.

If this is a GTP, and has a 4T65E, there will be no vacuum actuation in the trans.

 

[DarkShadow]

One more thing I can think of..... Check the range switch connectors, (the two connectors that go into the thing that the shifter cable connects to) i had a bent pin in one and the car would go into limp mode and not shift.....

 

[99PONTIACGP]

I scanned codes and everything was good... the mechanic missed one connector and didnt connect it. As soon as he did and drove it, it shifted...thanks for the help guys!