bob4360

In all my studying up to do a rebuild on one of these for a fellow that is pretty low on funds, I have found very little info about the lube system.
I'm just wondering how well that input to output seal works? It sure seems iffy plugging it into splines and being very low on rigidity.
So what sort of pressures are running in that circuit?
A video of a THM 350 showed it used a plastic bushing in that area, that the fellow replaced with a bushing. Would this be a good thing to do on a 4L60? I would think the added support would be a good thing.
Machining out the splines and making a plug to hold said bushing is what I was thinking?

bob4360

One other thing I have not found. It seems there is plenty of info on changing bushings during a rebuild, but zero information on the actual bearing clearances, I guess its a machinist thing to want to know that. The last transmission I built was REOF09A Jatco, and if I remember correctly, those bushing clearances even with new bushings were a bit on the large size. Its been so long now since working on other transmissions I don't remember their clearances, I've not seen them in manuals, but then I'm too lazy to dig into some of them.
Is that normal for transmissions to have a bit larger tolerances than standard of say .001 for every inch of journal or shaft diameter?