s80 can be a couple different trannies.....
Ls. itr, ctr etc. Does it have a vin plate on it?
The only clutch's that have diff spline, is small spline 90-91 and i think 00si.
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RIP Kevin Gonzales AKA Slo_Si 9/06
RIP Robert Kolp aka 00ek 4/07
RIP Pablo Garcia aka FatHead 9/07
_Jake D