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Re: I need help with what overdrive to install.
Jocko that chart is awsome but I have different actual outcome than the chart with my truck.
Mine is a 67 C20 with a 400 and 4.10's but my tach is sitting around 2900 rpms at 55 mph. That mph is actually going off of GPS since the speedo isnt accurate. That now has me wondering what my issue is.
I am actually considering converting to a 700r4 (have 1 sitting) and changing to a 14 bolt rear with 3.73's to make it more highway friendly. I live 6 miles outside of town and have only driven it in once because it sounds like the motor is gonna shoot pistons at 65 mph.
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72 Chevy LB, LS in the works, 4L80, Grandfather bought it brand new.
66 GMC Short Step, 84 Front Suspension, many more mods to come
67 Chevy 3/4 Ton, 327, Auto, Factory A/C
Ya must have been movin cause I was haulin a*$ when I passed you
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