Thanks Stretch, that info helps. I changed the differential in two of my 280TE's to the 3.46 differential, to lower the cruise rpm's.
I also have a spar 717.402 trans that requires the electronic speedo

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80 280TE, 5 speed
83 280TE- 5 spd, 16.5mm rear sway
85 280SL- 15" Bundts