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Just to shorten up my situation, my body bumpers that are mounted to the bed support frame/cross member are bottoming out on the topside of the axle housing. I have maybe 3/4" clearance between them and the shocks are nearly compressed with it sitting idle on the garage floor.. Make sure you look at that too.




As it sits on the floor, I have 5"+ of travel before the diff housing hits the bumpstops. IIRC, the shocks are sitting at mid stroke in their travel. I may need to go to a longer shock, but I will only know that after a few runs.

A friend on another site with a healthy BBF in a cal-trac'd F100 has a video of his rear end violently hopping off the ground at the stab of the throttle. Pretty wicked looking. He finally got it to settle down with much firmer shock settings.


Drag Week 2011 - 77th place - DD
Drag Week 2012 - 2nd place SRBB N/A
Drag Week 2014 - Kapooya
RMRW 2018
RMRW 2020