Few questions about K30's and 75/76 grilles

[1310monster]

I've been googling and reading for days now. I think I have at least part of it figured out. No D60's in the front until 77. I get that. What I still don't really have an answer to is was there a 4x4 30 series at all prior to 77 and would those have had the D44? Or was there just the 20 series?

Second, Is a 75 and 76 grill the same? I have looked at multiple pics and I can't tell the difference other than the 75 having the engine size emblem. Is there a tab for that on the 75 grill or are those held on by some other type of fastener?

[Irish_Alley]

i knew the 60 didnt come out till 77 models on gm. but never thought what was it before then. from what i can gather it was the dana 44 but i cant find much info on it. heres a ebay sale for the dana 44 hub for k20s and k30s.
EBAY LINK
now idk if gm still called a k20 with added springs a k30 but heres a 75 k30 with a dana 44


click the pic for the link

[Captkaos]

There were no 1ton K30 trucks from the factory prior to 1977, only have ton.