Transmission slipping?
Normal driving my trans shifts fine but when WOT it seems from 1-2 gear it shifts as almost its slipping into second. It shifts slowly drops to 4000 rpms then fells like it locks and go. I have monitered spark it seems fine not loosing any.
It feels almost like your in a manual car shifting slowly letting off the clutch then all of a sudden letting it go.
Its on my 99Z71 5.3L 4l60e.
Anything I can tune to eliminate this or is my trans taking a dumb?
Can you please Email me your file, I'll take a look.
ross@efilive.com
Cheers,
Ross
Re: Transmission slipping?
Strange, normally they do pull 'some' timing out, I know with my own car even with the PCM pulling timing down to 5deg or so it still shifted pretty hard.Originally Posted by 87gmc
I think as I said in an earlier post, when I changed my pressure tables the trans felt great for a month or so then started to feel like it was slipping a bit, after that I put a shift kit in.
I am not sure how aggressive (mechanically) the trans behind the trucks might be?, anyone know if they are any different to those in say a Camaro.
Cheers,
Ross
My tune file?
Yes please.
Cheers,
Ross
Mechanically, the 4L60E in a truck is the same as one in a f-body. The main difference is the converter,valve body, and the tune. I think the truck valve bodies are set up for a bit slower/softer shifts to lessen the stress from the heavier vehicle platform. A shift kit and some tuning can get a truck shifting like a fast car...
Have you done any trans mods? Shift kit? Servos? Tuning?
Tuning alone really doesn't go very far toward improving shifts. Tuning plus a shift kit and/or servos is a nice improvement.
2003 Silverado SS
N/A: 14.257 @ 94.63 mph
N2O: 13.200 @ 102.3 mph
Thanks Deezel, that's what I was not sure about, I guess you could play and play with the shift firmness all you want, but if the trans is going to mechanically limit you then you will get nowhere.
Cheers,
Ross
Posting Permissions
Reply With Quote