I was looking under my 88 440 2x chassis truck last night. the 79250 I have tuck way up in the frame.

I WILL know in a couple weeks though. I just got a bare 86 4x4 chassis and a 67 440 to mock up with a set of 79250s

RC/TD 2x and 4x4 chassis are identical to a 2x and 4x4 truck chassis other than the wheel base is shorter for a RC/TD.