[lolife99]

There were 2 different length housings in the 1970 model year.
You will need to verify what YOU have so you can order the correct parts.

Both of the '70 rearends I have are the same width as the wider 71-72 trucks 5-lug rearend.
Some say you could get the same width rearend as the narrower 67-69 in the early production 1970 trucks.
Too much money to guess.

Early housing is 55.5" backing plate to backing plate. (67-69 early 70)
The later housing is 57" backing plate to backing plate. (late 70 and 71-72)