<<"well 2 1/2 l came out and 2 1/2 went in, car on ramps at rear guess something to do with angle on gear box.">>
Don't you think it would have been better to have the car level, drain, and then fill it until fresh oil spilled out of the filler plug? You really can't be sure your gearbox has the correct amount in it. It may have been low to begin with.
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Doug
'81 SC Coupe (aka: "Blue Bomber")
Canada West Region PCA
members.home.net/zielke/911SC.htm