Hey ya’ll, Got some questions:
Was checking my rear diff and found markings 70 several times on the housing and the numbers C34835 also. There is a small tag that says 80-70
I also opened her up to cut new packing material (gasket) and change fluid; I took the op to note her numbers. On the spider gear I saw 135D and one the large gear ring I saw 035078

That makes me an Einstein in assuming that I have a Dana70, but what does the rest tell me? Ratios, etc. What additional markings would I see if it is a Dana 70 Heavy Duty, żHD? What can ya’ll tell me about my ride from these markings?

Thanks,
Big John,
’79 F350 inline6 2x4 crew cab

 

Just casting/dates I think
I WANT your truck bad a 70's Crew f350 300. I'm in love (the truck) I always wanted mine to be a crew cab 4x4,350,NP 435, 4.30 geared with an inline 6.BAD!!! ya baby!!
Thier she is.