pillarpod

Tranny was built less then 4k ago. at WOT my tranny shifts pre-maturely...At WOT the car oways shifted at 124mph to go into over drive now it shift into over drive around 94mph 1-2 it shifting at 3000rpms....any ideas on how to fix it?

performabuilt

iTrader: (25)

If its a 4l60e trans shift points are completely pcm controlled so something going on with tuning/programing or a sensor unless you have changed te rear end or something or put in a higher stall etc

pillarpod

i had a 2300 stall put in and rear in is stock. Does the Trans Go shift kits require an extra quart of tranny fluid?

jimmyblue

iTrader: (11)

On LS1s a TPS overvoltage at WOT will cause this kind
of behavior. I don't know about LT1s. Put the meter to
it and check your shop manual for what the fault voltage
max might be.

pillarpod

if it did that, wouldn't kick on my service light or no?

performabuilt

iTrader: (25)

Actually no thats a comon misconception codes are not always set when sensors are wrong. The PCM only knows a ceratin range it should be in and if its not then you will get a code but if its reading within that range but not right for conditions a code may not be set .

pillarpod

how do i check the TPS? (also what does TPS stand for?)

jimmyblue

iTrader: (11)

TPS=throttle position sensor. Easiest way to mess up
is over-aggressive bump-stop grinding, but bad ground
can also skew it.

On LS1s the TPS will set a code if it's over 4.75V for
more than 10 seconds (something like that). You may
not have that kind of time-over-target in street driving.

But any time it's over 4.75V it will immediately fall into
some self-protection modes like short shifting the trans,
code or not.

pillarpod

my second question is the TransGo shift kit Stage 2 take an extra quart of tranny fluid? The only reason why i ask is after i go my car back i drove it around for about 2 weeks and i decided to check my tranny fluid. Well they over filled it by 1 quart, so i drained a quart out and drove it around. It drives fine but again at WOT it bangs goin 1-2 and 2-3. The sound is like some one is taking a hammer and taking one big hit when it shifts.

southpaw0314

iTrader: (5)

could be trans mount from firmer shifts

FLT

iTrader: (1)

With a 2300 stall the shifts will be more noticeable. As far as the 1-2 shift the amount of washers used in the 1-2 accumulator housing could be an issue. Also if the installer flipped the 1-2 acc valve and sleeve in the valve body or if you have a sticky 1-2 acc valve this can be an issue as well. I have seen many times when the installer is not familiar with this type of work. The last thing to look at is how large the 1-2 feed hole is in the separator plate. With a lower stall I would have probably went with a smaller hole providing that the other things I have mentioned are correct. Vince