I've been having this problem for some time, first off my mods to a 1989 truck 700R4. I have the WOT gear kit 8673948, Corvette servo, .5 boost valve, Transgo SK-700 kit, and a new GM VB seperator plate. I had previously had Modifying my th700r4 this mod in, but i removed it because I was having the problems I still do. When I give it full throttle, it gets up near 60mph and then it acts like the trans disengages. It seems to be dependent on where the TV cable is, as I can adjust it some and it changes the pedal position it does it. I may have also bent the "rooster tail" for the gear selector a bit, could it be the cause of this? Any suggestions appreciated.

 

do you have a shift kit of some sort installed?

 

yes, the Transgo SK-700 shift kit. When I drilled the VB holes out I chose hole sizes that were as close to the middle of the ranges they gave with a numbered and standard sized bit set as possible.

 

crickets. Any ideas? Something else that I question is removal of the C-clip in the instructions, I'd had the 2-4 servo cover O-ring removed like in the Transgo kit instructions, but it leaked like a seive so I put it back on. Any thoughts on this?

 

Removal of the O-ring is for checking clearances only, you must install when the right clearance is established. Call me tomorrow on this, anytime past 1pm PST and I will try to help you out on this.

 

Removal of the O-ring is for checking clearances only, you must install when the right clearance is established. Call me tomorrow on this, anytime past 1pm PST and I will try to help you out on this. 909 7951876.