Had a very noticable "shudder" on a 2-3 shift tonight.....

[8UWITH6]

Hey guys.

Well, now that the GN is running great, of course my tranny is starting to get a little sloppy. Its not flaring bad yet, but the shifts at WOT are pretty mushy. I know Im in for a tranny rebuild pretty damn quick, so dont tell me thats what I need. LOL.

My question for you guys is:

What would cause a studder/shudder at WOT on the 2-3 shift? I was getting on the highway to go hang out with the street race crowd and wanted to make sure my boost level was safe for pump gas. So, I got on the on-ramp and layed into it hard, kicked into 1st, mushy shift to 2nd, then going into 3rd it just kinda hesitated, shuddered, engine RPM kinda fluttered just a bit, etc. I let off after that and havent WOTed the car to the 2-3 shift since. Converter was not locked or anything, just driving around town.

I guess my other question is:

I want to go to the track tomorrow one last time before I yank the tranny and put the GN away for winter........you think it will take 3 more passes? As far as I know its a stock tranny with almost 68K miles on it, no shift kit no nothing. Obviously you need to know if it does it again tomorrow at WOT on the street, but I cant tell you that right now. I guess I could push my luck......just give me some thoughts. THANK YOU

 

[MeanBuicks]

I can think of a few possibilities:

• Valve springs - As Bruce mentioned in a post above, tired valve springs can feel like a transmission problem.
• Knock retard - If you got into heavy retard, it also can give the impression that the transmission is shifting funny.
• Fluid level - Are you sure your fluid level hasn't gone down?

 

[8UWITH6]

Engine is fresh, with new valve springs, cam, and lifters.

No KR at all, 15psi and pump gas.

Tranny fluid level is perfect, with new Type F fluid from a while back

This is NOT the engine, it IS the tranny.

Thanks for the reply.......anyone else? Thanks

 

[GNVAIR]

Before you condemn the trans, have you checked the tv cable adjustment? It sounds like a 2-3 flare to me, but I can only go by what you described. I'm not trying to put you down, but why would you want to race if there is a possibilty the trans is going away? If it is in fact a flare, then the car is only going to slow down. I would check the obvious first.