androdz

Guys I need help to see what is wrong with my tranny. I have taken it 5x to the dealer already and they haven't found any problems with it and say that is usually for the new gt. Anyways the problem that I have is usually when racing when I go to change from 2nd to 3rd it usually takes 1 full second for the gear to get in and same with 4th. As I keep running the car it gets worst and worst. The other day it after doing a race it would not go into any gear. I had to try like for 2 minutes for it to go to a gear and then it was an *** to change the gears. I stopped and let the car cool down for 20 minutes and bam it no problems. Sometimes I have the problems with getting it into reverse. I was told it could be the throw out bearing but if that was the case shouldn't it sound like a busted bearing when I engage the clutch in neutral? I have no idea what could be the problem, thought at first it was the shifter binding but I got the k-member with the Torque Limiters installed and it still has the same problem. Any ideas or possible solutions would be greatly appreciated thanks.

Edit: also I almost forgot I changed the transmission fluid 3 months ago to RP synchromax

Andrew

bl1nk

I was going to suggest the fluids but you edited that back in. Almost sounds like the trans is getting too hot, especially when you say that after a brief wait it works fine again.

Norm Peterson

Since it appears to be limited to3rd & 4th gears, I suspect that the 3-4 synchro hub may be damaged. I broke a hub once, and the tranny fought me every mm of the way into gears under some conditions (but not all the time). Found it cracked into three pieces, and it was kept from falling completely apart and off the shaft by the synchro rings themselves.

I'd make sure that whatever gear oil you use is recommended for use, as different trannies respond differently to different oils, and come with different recommendations. By way of example, the Tremec 3550 that I have in one car came with a recommendation for GM Synchromesh Fluid.


Norm

billyjo

what i think is happening is that the RP is to thin for your tranny and you need a thicker oil for the auto trans. If the oil is to thin than the shifting will not happen. You may need to go back to stock oil.

jmk3

I think he has manual but he never said so.

Norm Peterson

Ummm, I'm pretty sure it's a stick . . .

howarmat

+1...he talks about shifting many times

BigDave

This does not fully explain your problem, but could your hysraulic clutch fluid have air in the line, and be getting hot and expanding the bubbles? Yeah, sounds kinda far-fetched...

Norm Peterson

I doubt that the clutch fluid is the problem, else he'd also have trouble with 1st and 2nd.

I'm guessing that he has more trouble selecting reverse from either 3rd or 4th than 1st or 2nd, too.

Another possibility is a bad 3-4 shift fork.


Norm

androdz

Thanks for the help guys, yes it is an 05 manual. It drives perfect under daily driving no problems but during high revs, I dont power shift but a quick shift at 6,300 will just not happen.

Andrew