I would start with a real close inspection of the entire suspension both front and rear. Look closely at all mounting points, checking for cracks or anything worn or in a bind. Then maybe find some scales and see what you have there.
Posts: 469 | Location: Going to or returning from the chipmine. | Registered: July 01, 2011
Absolutely, check for broken shock, binding or broke rod end, check all the welds on the ladder bars and housing. Check your track locator / wishbone for anything broke, loose or bent. You could put car up on jack stands an raise and lower rear end with and with out shocks checking for binding, twisting or strange movement. Check for any movement in front ladder bar mount including the rod ends there. Then check the front end, look for loose steering box, play in the box, check your toe in through out range of travel. And if you have video look and see if it pulls one direction or the other when one or both of front wheels are up. Also could be rear tires going away, a small tire on a heavy car sometimes sidewalls do not last as long as a big tire car.
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Posts: 3706 | Location: United States of Texas | Registered: April 02, 2011
Had a friends car doing the same thing (not quite as fast as yours) It was the front shocks were junk. If you jacked it up and let it down fast, it would settle differently each time and it was steering the car on launch.
With ladder bars on a similar type car we found the ladder bar front mounts tearing loose from the frame. Our clue was the rear tires would keep changing location/distance from the outer fenders when parked in the pits.