Quote:
Originally Posted by h0m3sy
83t spur with 21t pinion should be fine to start with on a 10.5, never ran a 13.5 so can't help with that one.
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That sounds very under geared to me. For the 10.5 you should be up around 27 or 28 if it fits with the 83 spur. I would reduce the spur to 76 or 78 and then start off with a 26 pinion and go up from there if temps are ok. Last time I ran a 10.5 I used 78/27 with a speed passion motor. Temps were fine.