Hey, I'm rebuilding a 86 model 700r4, and my reverse input drum clearance is to high i think. it is .090". What is the clearance supposed to be ? My 4 steels are .075, my frictions are .068 , my backing plate is .260" and my snap ring is .061. This is the early trans without the aux valve body, and its a steel piston. Thanks.
Mike

 

Should be .040 to .076" Will need thicker backing plate #2

 

Where do I get one of these? order through a local trans shop? i have another core but it has the same one in it

 

Also in my core i noticed that the reverse input drum has a bellville plate on the very bottom and the one im rebuilding does not, could i use that to take up some of the space? or is there a reason why that is not in there?

 

.050 i my preferred target clearance.

 

Get the plate at your local chevy dealer
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It should have the belleville spring in there

 

If the drum has a steel piston, it will need a waved steel on the bottom, then clutch, flat steel, etc. DO NOT use the Belleville on a steel piston setup. The waved steel will reduce the clearance. Dana