3.23, but trans was originally on car with 2.73. I took the motor/trans/pcm/harness from a 95 w/2.73s and put into 93 with 3.23. So the pcm is set up for 2.73 gears.

 

I personnally see nothing wrong with your tables considering the 3.23. rear gear.

 

Once again, what throttle body are you using, and what are your TPS values?

 

What torque converter are you running? I had a very similar problem a few weeks ago. Tranny was perfectly fine. The problem was in the tune.

 

The 3-4 clutchpack is energized for the 2-3 shift. For 4th gear, it stays on and the 2-4 band also comes on.

 

I was referring to something being off slightly in the tune's shift tables causing it to not shift correctly, not as a temp fix. More of a diagnostic tool than anything so if it got better it was a tune related issue.

I'll also say X2 on the TB and TPS readings, that can cause shift issues.

 

Stock throttle body w/coolant bypass. TPS volts are .59-.61 closed and 4.55 WOT. Riding around this afternoon, the transmission runs and shifts good even at 60-80% TPS, but just not 100%TPS.

How do my TPS numbers look?

I've tuned the shift tables down at 2-3 to try to get it to shift. Are the tables I posted the only ones used to by the pcm to signal the trans to shift?

 

Torque converter is stock too. Anybody have any other ideas?

 

TPS values look fine, only other thing that I could even remotely see being the problem would be the fluid level. Sounds simple, but the higher rpms could be sucking the pan dry. Unlikely if it shifts fine in the other gears, but don't count it out.

Sadly looking more like a mechanical issue

 

I am having the same problem after my tune... The one thing that I noticed is that it won't shift but when you let off it kicks right in to third. If I try to get back on it after the shift it still down shifts back to second. Just something to look at. gl let me know so I can look at mine.

 

Honestly I just think its a worn out 4l60e they tend to do this my camaro had 115,000 on the trans it did the same thing every thing else worked fine on it just the 2nd to 3rd you had to let off just a little for it to shift my friend also had one with 160,000 and it was even worse about shifting 2-3 then he lost 3-4 clutch

 

I'm convinced it's the transmission now. With the shift point set at 5000, and rev limit at 6200, whenever I get to 5000 in 2nd at WOT, it is trying to shift, but then the RPMs jump to 6200 real quick like the trans is slipping. Motor is turning but transmission is in limp mode until u let of the gas and let it shift, then if you hit the gas hard enough, it goes back to 2nd again. I can tune the downshift point and fix the downshift to back to 2nd, but that's no fun. I guess I won't be bringing it to the track until I can afford a trans rebuild.

Thanks for the help everyone!

 

RamAir - What are you getting at with the TPS values and his shifting? Were you thinking that he had a Holley TB (that turns past 180*)? Will TPS values affect WOT shifting?

 

Absolutely. It's a pretty common problem. I've seen it happen on stock throttle-bodies too, but moreso on aftermarket ones, like the Holley.

 

I understand the slip but I don't understand why it would shift back down to second you are already past the speed and rpms to drop back down to second.
To me that sounds like a foul on both the tune and the transmission. Am I wrong?

 

Well, I probably let off the gas too much and then hit it again, so maybe I slowed down past that threshold. Remember, I have the 2-3 shift set low at 5000 for test purposes, which I believe is about 60-65mph. I'm sure if I worked it just right, it would stay in 3rd gear, but I'm not going to push it anymore, I just wanted to pinpoint the problem and I think I've done that. According to the experienced writers on here, my relationship with my transmission is almost over, so I'm just going to enjoy the days we have left and be gentle with her.

 

im having the same problem with mine an i have a built trans with 36000 stall an they say its because i need a dyno but im not sure so im going to drop it off again soon hope yu get yours worcing too

 

I have a Holley and it turns past 180* which throws a high TPS voltage code. I deleted it from the PCM, but it still seems to be strange at some points when i shift or try doing wot tuning.

I am no expert tuner, and the car is in SD which I know will play an affect on how the 4L60e operates. Do you have any hints on what I need to do to get mine to shift right or should I just take it back to the tuner and have him do the shift points? Im thinking the latter

 

Good point you mentioned about the fluid level. Even on an otherwise perfectly functional transmission, running at the strip with decent power, you need to run it slightly above the top mark of the range on the dipstick, if you're not running the deep pan I mentioned above.

 

ditto.... +3