700r4 problems

[87chevy]

ive been having problems with my 700r4 in my truck. When your driving over 60 it wont down shift hard. even if i manuel down shift it wont come in hard. once it goes into 3rd gear from overdrive it would stay in 3rd gear until you wont let off the gas. the other night i was racing a 2004 chevy regency with a 5.3litter of a friend of mine got the truck to 65oo rpm and would not let go of 3rd gear. i still beat the guy by a truck but imagine if it would shift into overdrive after that. any kind of help would be greatly appreciated

[19_Chevelle_69]

The 700 will not shift into overdirve after 75% throttle angle. There is a unit available from Summit that overides this.

Check this...
store.summitracing.com/partdetail.asp?autofilter=1&part=BMM%2D70237&N=115&autoview=sku

[Pontiac1976]

What motor and cam in that truck that you shift @ 65ooRPM ? .
You know the Spec: ::)on it. What done to the block & what rear gear in it.