drag racers change powerglide convertors to th350/400 convertors. the input shaft is larger diameter and stronger. you hog out the hole in the pump to accommodate the larger shaft.
What you want to do would make the input shaft weaker and you cannot make the hole in the pump smaller. i would imagine you would have to buy a new pump or convert a powerglide pump to fit.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.