Quote:
Originally Posted by jocko
1970 C10 w/6+PG was 3.73 standard, 4.11 optional - so if you have nothing called out on the SPID, the truck was born with a 3.73. No guarantee that's what's STILL in it, but as that how it came into the world.
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Appreciate that info. I’m pretty confident that the original ring and pinion is in the truck. I’ll most likely pull the cover this weekend and count the teeth to confirm before ordering more speedo gears.
With the 700R4, converter locked up, it cruises along at 70 mph right around 2k rpm.