Transmission not shifting at WOT.

[don86T]

My transmission occasionally won’t shift into 3rd gear at WOT. It happened one time last year, then again once last night. It has only happened twice in over 100 passes. Once I lift the throttle it shifts. The transmission is a stock 2004r with a B&M shift kit. I haven’t adjusted the throttle valve cable in a while. Is it possible the cable has stretched? Or could it be the P/R valve is hanging up? Any other ideas of what may be causing this?

Thanks,
Don

 

[ZR1TR]

Sounds like we are in the same boat. Just got a new transmission put in and it shifts great while cruising. At WOT it will not seem to shift into 3 at all. Had it at the red line and backed out and it finally shifts. I thought I was running out of fluid and added more, still same results. Played with the TV cable and didn't notice a difference at all. I've heard that with 1-2 shifts sometimes the governor spring pops off. Hoping this is an easy fix similar to that. Lonnie Diers built this tranny so I will be contacting him to see what he thinks. If I resolve my problem I will pass it along. And what is the P/V valve?

 

[don86T]

ZR1TR,
Does your transmission always not shift at WOT or occasionally? If you find the problem please let me know.

The P/R valve (pressure regulator valve)controls the line pressure. I think the B&M kit came with a new spring but I'm not sure about the valve. I need to find the instructions to check.

Don

 

[ZR1TR]

I talked to Lonnie Diers from extreme automatics and he said to first adjust the TV cable. Move it a few clicks toward the radiator. I did that over my lunch break and it seems to be working better. Haven't had a chance to go rip a WOT run, but will this afternoon. He said to check fluid level, overfill about a quart. Also he said it wouldn't be the governor spring because it would affect all the shifts. I think mine is TV cable related. It is possible that the TV stretched or even slipped out of adjustment. I don't think I helped you any but maybe so.

Jonathan