clutch basket question

hello,
I have a 74 850 and i was having some drag issues. I opened up the basket and saw that i only had 3 plates and 4 friction plates. i ordered another plate and the 5 barnett friction plates. when i measured, i had an almost "perfect" stack height of 1.14 off of the "perfect" 1.17. my problem was that the plates were too high not allowing me to reinstall the circlip. What i did was remove the fartherst back friction plate from the inside, so i now have two flat plates on top of each other in the back. Is this going to be a problem? also, why would 1.17 be "perfect" stack height when my shorter 1.14 wouldn't even fit? thank you for any advice
Lee

It sounds like you have the thicker pressure plate (the heavy outermost plate). From memory the thick one was on 750s while the thin one was on the 850s (to allow for the extra plate). I'm sure others will provide more detail.

krullbeast said:

when i measured, i had an almost "perfect" stack height of 1.14 off of the "perfect" 1.17. my problem was that the plates were too high not allowing me to reinstall the circlip.

Click to expand...

Where did you take the 1.14" measurement?

At the edge of the plate stack or does it include the raised thrust ring of the pressure plate?

How thick is the pressure plate (total thickness)?

the 1.14 was the measurement of all the plates including the pressure plate(not including the raised part just the end of the stack), which IS pretty thick, i thought. I thought the 750 pressure plate was the thinner one and that the 850 was thicker?? if the 850 pressure plate is thinner, then i definitely have a 750 one on there. shoot

krullbeast said:

the 1.14 was the measurement of all the plates including the pressure plate, which IS pretty thick, i thought.

Click to expand...

Yes, but where did you take that measurement? Was it the measurement at the plate edge (where the splines are) or was it the total height including the pressure plate thrust ring?

krullbeast said:

I thought the 750 pressure plate was the thinner one and that the 850 was thicker?? if the 850 pressure plate is thinner, then i definitely have a 750 one on there. shoot

Click to expand...

850 is thinner = 0.227" total, 0.102" at the edge.

750 = 0.347" total, 0.225" at the edge.

Dynodave stack height dimensions are "including the FULL height of the pressure plate"
http://atlanticgreen.com/clutchpak.htm

Old Britts stack height dimensions are taken at the edge of the plates.
https://www.oldbritts.com/ob_clutch_info.html

that measurement was taken from the plate edge

krullbeast said:

that measurement was taken from the plate edge

Click to expand...

OK, 1.172" is the 'dynodave' total stack height which includes the full height of the pressure plate, not the height at the plate edge which, according to Old Britts, is 1.027", so it looks as if it has the thicker '750' pressure plate.

thank you! looks like i need to find a thin pressure plate and i'll be all set. too bad they are like 90 dollars hahaha. what a treat! i appreciate the help

krullbeast said:

thank you! looks like i need to find a thin pressure plate and i'll be all set. too bad they are like 90 dollars hahaha.

Click to expand...

You could have the plate machined down. I don't know if that would work out any cheaper or be worth the trouble?

Or try an ad in the 'Wanted' section?