I'm running a Performance Automatics SuperComp C4 behind my BBF. So far the car has only seen about 200 miles on the street, still sorting it before I hit the 1/4 mile. I've yet to give it a WOT launch, due to lack of traction with street tires, but have noticed that with about 1/2 throttle or more the 2-3 gear change will slip. The engine picks up a few revs during the gear change, and the change takes maybe 1 sec, whereas all other gear changes are firm and instant. The gearbox has a full manual rev pattern valvebody with transbrake, though I do not have the transbrake wired up yet. Is this problem a symptom of something serious, or is it just a band adjustment required?
Any advice I can get before I take it to a trans shop would be much appreciated. Thanks.