Let me start by stating that the tranny does not slip, has no metal in the pan, is full of fresh fluid, and when it does shift does so in a short crisp (normal) manor.

The problem is that my tranny computer sends a signal to shift at 6200rpm, I verify that the tranny is reporting it is in the next gear at 6200rpm, but it does not actually shift until 7150rpm.

I am thinking a physical shift kit would help, or maybe a new shift servo of some type? I don't really know what makes these tranny shift. Is there a check valve I can remove that will help this? Any ideas? My tranny has been like this for awhile, and got worse with the TP4400 (had a ST3800 before).

 

Terry,

The tranny shifts when told so by the computer and only then!! The 4L60E has no governer. Althought the computer does take into consideration alot of things, i.e. throttle percentage, tps voltage, rpm, wheel speed(tss), I also believe that trans temp as well as engine coolant temp will vary shift points/stiffness. Just a few thoughts <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" />

Mark

P.S. Did you see Justin at the track on Saturady?

 

I have a TCI tranny computer that shifts my tranny. It's telling the tranny to shift, the tranny is not shifting on time. I'm trying to figure out why.

I saw Justin in his new ride, I think it ran low 15s... <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

 

OOHHH I didn't know you had an aftermarket controller!! Try a transgo , and you said it is NOT slipping?? So the shift solenoids are getting voltage at 6200rpm but not shifting until later??!! Are we basing rpm on ATAP or that $hitty factory LS1 tach?

Mark

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Terry Burger:
<strong>I saw Justin in his new ride, I think it ran low 15s... <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I think thats one of the fastest stock trimmed trucks around?? He dyno mid 240's also!! It's a real runner!! Maybe 10's one day?? <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

Mark

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">
OOHHH I didn't know you had an aftermarket controller!! Try a transgo , and you said it is NOT slipping?? So the shift solenoids are getting voltage at 6200rpm but not shifting until later??!! Are we basing rpm on ATAP or that $hitty factory LS1 tach?
</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Tranny doesn't slip, gets voltage at 6200rpm, and doesn't shift until ~7100rpm. I'm using an ATAP type program to verify this. I'll give the transgo shift kit a shot.

 

Terry,
I have the TCI computer in my car as well. It's a common occurence to have a 300-400 rpm differential between solenoid activation and the actual shift. That's about what mine is. It takes time for the actual hydraulics of the shift to take place. It sounds like you're on the right track with the shift kit.
Kevin