98TADRIVER

iTrader: (36)

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

TA4U2NV77

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

TA4U2NV77

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.

98TADRIVER

iTrader: (36)

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

TA4U2NV77

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.

98TADRIVER

iTrader: (36)

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

slow67

iTrader: (2)

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.

01ssreda4

iTrader: (96)

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.

98TADRIVER

iTrader: (36)

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

01ssreda4

iTrader: (96)

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.

98TADRIVER

iTrader: (36)

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

fly pantera

iTrader: (9)

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.

Mike Morris

iTrader: (55)

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

98TADRIVER

iTrader: (36)

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

01ssreda4

iTrader: (96)

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.

1gt2nv

iTrader: (5)

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.

98TADRIVER

iTrader: (36)

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

1gt2nv

iTrader: (5)

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

mannyman84

iTrader: (2)

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

98TADRIVER

iTrader: (36)

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