Shifting question......

[pewter99ta]

I have a stock 99 with 70000 miles, and it is shifting kinda weird. During medium accel, it rpm's will build, and it will act like it is shifting for a sec., then build rpm's for anouther sec, or 2, then shift. Does it during all shifts. Dosn't do it during wot, or light accel. Any ideas? I am thinking of going with this shift kit, but want to get this ironed out first.

http://www.700r4l60e.com/store/customer/product.php?productid=90&cat=28&page=1

Thanks guys!

[02 Mag Red]

I am not 100% sure but I have to beleive it has to be a bad sensor or something that is commuticating with the trans . I do not think it is the trans . It could be the timimg retard before the shift ? 1st Check trans fuild when it is hot . Let us know what the out come is !
Joe