Jim-I'm interested to see what you come up with on the speedo fix. I've had the 3.73 when the gte went in. Lewitz and I looked at all the speedo gears and long story short I concluded - the inner tailshaft drive gear needed to be changed along with the outer nylon gear - this was for the '85 P-type.. So, used a GPS and calculated that I'm off 10%.. easy # to add to the speedo.. Jay Bjdk_ii said:Not done yet. I have the parts. Just need to play "Operation".Crocket said:how did you correct your speedometer with the new rear end (3.73s)?