Rearend ? along with Gear ratios.

[Dan 67 Chevy LWB]

What different rear nds came in the 67-72 trucks? Did it vary depending on if it was an I-6, SBC or BBC. Also what gear ratios were offered.

I have a truck that started as an I-6 and 3 on the tree. If i remember from few years ago when i figured it up, my rearend as a 4.10 gear.

I'm in the process of converting to a BBC. So want to make sure or see if it is best if I change my rearend.

Thanks