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**jocko** · 09-20-2018, 09:35 PM

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.

09-20-2018, 09:35 PM	#2
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,934	Re: What rear gear do I have? 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.