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04-13-2015
Why would my auto 4T65e hd transmission shift fine while driving regular but at wot it shifts very late? Even with the PCM programmed to 1-2 shift at 43 and/or 5700rpm it still hits 53 and 6300rpm? Those numbers could be off a bit but the fact is its not shifting when the PCM tells it to, 1-2 and 2-3 at wot. It don't feel like its slipping or banging into gear in fact it feels great. Any help is greatly appreciated, thanks.
04-13-2015
It will command the shift at those points, but by the time it select the next gear, moves fluid around and drops into the next gear it can increase rpm 200-400 and the vehicle speed can rise 2-5 mph.
04-13-2015
Regardless of how low we made the shift points it still shifted at 6300rpm @ wot. The tuner seemed to think the transmission was slipping but I'm not feeling it, can this be caused by something else?
04-14-2015
There are two tables. Are you looking at the Wot settings?
04-14-2015
Just to be clear I'm not the tuner. The car was originally tuned by 3800Chris and most recently by Tune Time Performance, both mentioned the same issue and both are very experienced with the 3800. Now I just want to know why, maybe just a sensor I hope....Originally Posted by BillBoost37
04-14-2015
Did either give you a copy of the file that you could forward over for us to look at?
There's often a slight lag from the commanded shift speed/rpm to when it actually occurs. The rpm are climbing and when it hits X it's told to shift..so the actual shift happens slightly later. Your difference seems too large though.
04-14-2015
Clutches are shot. Valve body issue. May need an overhaul ....
04-14-2015
Damn I hope not.
04-14-2015
If it's shifting fine, just late. Ya know.. tables are usually the issue.
04-22-2015
I ordered the Intense Shift Kit, I hope it helps the shifts complete faster.
04-22-2015
Heard they were on back order till Monday / just ordered my 2nd set too !
04-22-2015
You are correct, I ordered mine on Friday and a guy named John called me yesterday to let me know it would be another week.
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