Ok I have a 406 sbc with around 500 hp +/-
Connected to a "built" 700r4
I actually got the engine and tranny together as a package deal.they were in a international scout that had a posi and 373 gears.

The fluid smells looks great and the overdrive cable is adjusted correctly...
I've been driving my car for around 2 months on this combo with no problems
shifted really strong in all gears!
now shortly after installing a quickspool with 456 gears the 2-3 shift seems to be "binding" under full throttle or not "shifting" correctly

when it does shift it doesent slip I think it could be a brake band for 2nd gear maybe.? how much for repair??

What are your opinions and what should I do having limited funds

 

unforuntely, your description doesn't help much. If your band is slipping you would notice sloppy shifts out of first gear. By changing the rear gears that much, you have drastically changed the operating range of the engine/trans. You may wanna contact some of the high perf trans builders and see what they recommend. It may be just as simple as changing the governor to adjust the shift points.

 

There may be something to that idea because I'm thinking the same thing about mine and I have 4.11 gears. I know there was a big thread about the governor a few months ago. I may need to read through that now. It just seems strange that something that doesn't appear to be tied into the valve body could have such an impact on operation.

 

It may not be attached to the valve body but it controls fluid flow. The valving inside the governor is part of the fluid pressure system, which is what determines when the transmissions shifts.