Question : Tranny slip/late shift under light load?

[2FastChevy]

I've noticed on occasion after the engine warms up on my 99 lumina that the transmission appears to shift late/ slip lightly as I got into third under light throttle/load. It never seems to do it when I accelerate under moderate to heavy throttle conditions..The vacuum modulator is in working order and isnt leaking so I was curious to find out any possible solutions to the problem. the car still feels strong overall just its a concern that i dont want to become a major problem..last i checked the fluid level was correct and the condition of the fluid's good, i flushed and refilled the transmission back in the summer time. I'm kinda stumped so any suggestions would be great, thanks alot!

[gpse3400]

You could try buy an ajustable modulator and crank it up...but I am also thinking that the 2-3 accumulator is damaged. that required lower pan removal.

[2FastChevy]

sorry to bother you again but wouly you happen to know where i could find an adjustable modulator? Hmm if it did turn out to be the 2-3 accumulator would the best solution be to just replace the whole valve body unit? Dropping the pan and doing a re and re is something I'd be able to tackle.

[bszopi]

http://60degreev6.com/forum/f103/adjustable-modulator-4t60e-t37641

Post #10