98`P71 Trans ?

Under hard acceleration it wont shift from 2nd to 3rd unless i let up.
Any ideas?:banghead:

It won't EVER shift, staying in 2nd as long as you hold the gas down, or does it shift later than you would like?

Did you or any previous owner put in a higher rear end gear ratio gears? If so and a re-tune was not performed, the rev limiter may be reached before the 2-3 shift speed (in MPH) is reached and it will bounce off the rev limiter in 2nd gear.

Did you or any previous owner put in a higher rear end gear ratio gears? If so and a re-tune was not performed, the rev limiter may be reached before the 2-3 shift speed (in MPH) is reached and it will bounce off the rev limiter in 2nd gear.
I don`t Think it has been modified.
Their are no codes comming up,I was thinking shift sensor?
Its an old police car 240,000 miles.also when accelerating the RPM races up before it shifts hard into 3rd.Changed the fluid and filter but it didn`t help.
Any and all ideas would be appreciated. Thanks

So 9 months later, it's still doing the same thing? Asking again - so it will NEVER shift unless you let up, right? My '93 did the same thing, now that I'm thinking about it.

That is correct,I have never held it over 4500 rpm but it won`t shift till i let up.