2wd vs 4wd frame

[72gmcshorty]

Whats the difference between the two frames (i understand the front difference, what about the back?)

[Mike C]

Not sure on a Blazer, but on the trucks the spring centers are 40" on 4x4 and 42.5" on 2x4. The rails are splayed and not straight.

[Gee_Emm]

Here is the backl half of my 2wd. Not sure but I think the 72 2wd frames might be different then the rest of the 2wd frames

[6772king]

here is a pic of my 71 blazer 4x4 frame kinda hard to see

[6772king]

here is my 72 jimmy frame also notice how the 2wd frame flares out over the rear and the 4x4 doesn't as for the 72 2wd frame I thought the only diff was the rear bumber mounts???

[6772king]

oops forgot the pic

[raggedjim]

Most obvious is 4x4 has leafs and 2wd has trailing arms and coils.

Rg

[jamie72]

hey sean you need to stop posting pics of my yard...lol

[Gee_Emm]

The 72 bed floor has the notch out on the rear cross member which leads me to believe that the frame angles up at the back, did the 71's come this way also?

[6772king]

the 69-714x4 frames and 70-71 2wd frames ended right behind the last body mount so the rear cross member didn't need to be cut out (the frame ended before the rear cross member) so the 72 was the only year that the bumper mounted directlly to the frame. panel's and subs' were the same way' I'm not sure about pickup's

[6772king]

another view