Has anyone had a problem shifting into either second or third gear while they are accelerating rapidly and running anywhere from 5-7k rpms. I took the car to the track and when I tried to shift either into second or third gear under full boost as I go to shift into the next gear it feels as if there is something blocking me from shifting. The clutch is not the problem. My clutch engages perfect and there is no slippage. When I drive the car normal though and shift at a much lower rpm I can shift into any gear no problem. I guess the best way to explain this is as I am driving under full boost and I grab the shift knob and move it to the next gear it feels as if there is something under my shift boot like a plate or something that forces me to have to physically slam or wrench on it to get it to the next gear. I have no idea WTF it could be. Any ideas would be greatly appreciated.

 

Check on the right side of your engine bay to make sure your vacuum Line from the TB to the Brake booster is not contacting the shift linkages.

 

What clutch do you have?
LNF TOB upgrade?

Sounds like your TOB is shitting the bed. Mine did exactly what yours did before it blow apart into 5 pieces.

Is your clutch pedal getting light under high revs to? When your under full boost and high revs pump the clutch pedal a few times and then see if it falls into gear.

 

check the roll pins.

 

I checked and there is no contact

I still have the stock clutch from the factory in the car. I am going on 112,00 miles on the darn thing. My clutch pedal is not getting lighter on high revs but after shifting and then accelerating as I go to shift again I notice a lot of the time the clutch pedal is super stiff. But after I shift and lower the boost and rpms and drive normal everything works fine after.

 

Where are the roll pins and how could they be causing this issue. Just wondering

 

Top of the trans. It's in the fork thing that switches gears in the trans.
Broken or stretched, they could be causing an issue.

 

Also the shifter bracket, friend had an lsj he couldnt shift quickly into third, turns out the bracket was snapped in half. Link for what I'm talking about GM ACDelco - Revised Shifter Bracket for LSJ #GM-55563732

 

Before he fixed this bracket, did the car still shift normally while not under a load?

 

Yes it did, sorry for the delayed response, you can always look at the part before you order it. There is a chance its broken, and at a minimum it will firm things up, its one thing on zzp's site that actually has some listed reviews