Im a noob when it comes to automatic transmissions, so i apologize in advance lol.


Here's the story on it-

in november 2010 i ran it at the track with no issues. at the time i had the stock 2.73 gears and a 3400 converter with a shift kit and my buddy's tune.

added 3.42 gears and 90mm intake/ tb and had my buddy re-tune it for me. part throttle is fine. It will not upshift into 3rd gear at WOT at the track. Also if i go from a slow roll or dig on the street it does the same thing. 1-2 shift is fine and the car pulls hard all the way through 2nd but it wont upshift into 3rd @ wot. It will not shift unless i let off the throttle a little bit to let it shift, then i can get back on it and itll continue to pull hard

Now here is the weird part- When im cruising anywhere from 35-65mph and go WOT, itll downshift into 2nd gear and upshift into 3rd gear perfectly fine with no problems.

I took the car to a transmission shop where a friend of mine works. he hooked up the scanner and found no problems with it. We couldnt do a WOT pull, but he said if the trans had any kind of problem, it'd show up at part throttle

Im pretty sure i attatched the correct HPT file. Any ideas? All help is greatly appreciated

 

did your buddy that did the tune mess with your shift points.

 

cause i had a similar problem but it was my first gear. and after pulling my hair out i went for a true tune and my shift point for first was not right and that was the problem. might not be the answer but thats the only thing i could think of.

 

yep, I think there are 2 tables for shiftpoints. upshifts and downshifts. they are good as far as mph/rpm goes. The 2-3 upshift is perfect when im on the highway and go WOT anywhere from 35-65mph. It only seems to have the problem when going from 1st gear. I notice it the most at the track since i can dead hook there. He even commanded the 2-3 shift earlier just to get it to shift, but it would still pull to limiter and not upshift when I'd go from a slow roll/dig

 

wow. do you know who vince b is. he is a tranny guy on this site. if you can find him, he will know cause the only other thing i can think is a internal problem in the trans.

 

That the other thing, i had my friend use his transmission shop's scanner to look for any problems that i might have but he didnt find anything. Ill search the members list for him and send a pm. thanks for pointing me in the right direction

 

I would see if you can get a log of the WOT 2-3 shift (or lack thereof) logging commanded gear to see if the PCM is commanding it. If it's commanding it, its a transmission problem, if not, its a tune problem.

 

Yep you need to log a run. The shift needs to be commanded earlier. 2/3 can be real lazy once a converter and gears are added.

 

alritey. how would I know if its being commanded? My buddy who tunes my car said he commanded the shift alot lower before, but it still wasnt shifting

 

I looked at your tune. The shift rpm looks like mine, normal for first and third but lowered for 2>3. Remember mph has to met first, thats why we need a log so we can see and exact reference of mph vs. rpm with the converter flaring. i also think the 100% column on the part throttle table should match your wide open stuff which it doesn't.

 

alrighty, ill try to log it whenever i can. does your 100% column on your part throttle table match your wide open stuff? thank you for your help thus far

 

mine does the exact same thing as yours,even on highway pulls,exactly like yours.
hooking from a dead stop it shifts fine from 1-2,but bounces a couple of times on the limiter when it shifts from 2-3.

 

Move your rev limiter up!!. Where is it set?
90 percent of time I see this happen people have it set too low which affects the 2-3 shift. With the new mods and slow shifting with the trans you wil bang against it all the time

 

thanks fellas! whenever i get a chance, im gonna have my tuner buddy log it, then make the necessary changes

 

Looks like you've got a 6300 rev-limiter. I would bump it to 6500. Honestly, my stock trans would shift at 6450 but not at 6350. **** was weird but thats just what it would do.

 

Not trying to hijack. But I'm getting a tune by frost for my 4k stall. I will not have this issue with the shift points will I? I would think he would move the rev lim up a bit.

 

I think my tuner mightve just missed one of the tables. you should be alright

 

Ya that stuff happens. Did you get it figured out yet?

 

Same problem here but no tune or anything done to the car. I'm suspecting the 2-4 servo

 

not yet, the weather has been crappy. im gonna get a 2nd opinion from a buddy of mine on tuesday