riche

I'm getting ever so close to finishing this thing. Keeping my fingers crossed...
But I have a question about the 3-4 accumulator piston bore.
Mine has scuffs near the edge of the bore on one side. I may have found what contributed to the 3-4 clutch failure in this trans.
Anyway, back to the subject. My question is should I sleeve this bore, or not worry about it if the shift kit plugs the feed line to it?

At this point in the game with the money I have tied up in this build I don't mind sleeving it. However I can't help but think it doesn't matter if fluid will not be applied and in return bleed off around the piston.

Thanks for the advice

Pro Built Automatics

Plug it up like it does in the TransGo 700-2-3 Shift kit. Once the bore is plugged the piston and pin are no longer needed. This rarely has to do with the 3-4 clutch failure.

riche

Thanks Pro Built,
I think I see what you mean, the 3-4 accumulator has little to do with the 2-3 shift (clutch apply) and more with the 3-4 band apply. When I plug the feed, the piston will not cycle anymore. But it still has to be there to keep the 3-4 accumulator oil from dumping out the exhaust hole. I shouldn't have a problem bc the scarring is in the lower portion of the bore and the accumulator oil will keep the piston in the upper portion of the bore. I did replace the piston just for a piece of mind. I figure the 3-4 accumulator oil could bleed off there if the piston pin wear was bad.
I really need to find a flow diagram for a 700r4 I found some 4l60e diagrams which is helping me learn some.

Pro Built Automatics

I have been blocking the feed hole for 4th accumulator, for well over 20 years now without any problems from making this modification.