Join Date: Jan 2009
Location: Havre de Grace, Maryland
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I would ditch the 5 leaf spring set up & slapper bars. Go with the Cal Trac single spring & Cal Trac bars made for 71-73 Mach-1. Works great for street & strip use.
Secondly, replace the perches and add a support plate to "box the perch into the axle tube. This modification adds plenty of support. Also add a tack weld or two to the axle tube @ the center section area. If your really gonna put some hp & traction to it, add a back support to the housing to reduce flex. Hope that helps.
QUOTE=xoliex;991414]well after a night of racing with 7 passes before my starter goes dead (71 429 mustang replacement) and replaced with a 96 F350 460 manual trans starter, i noticed my car is leaning towards the driver side and has that gangster lean. i couldn't find anythign wrong with the car so i put my street wheels/tires back on and i have a vibration at 45mph+ so i go back under there and i find my pinoin yoke point up towards the floor board and the driveline is angled wrong. i disconnect my driveline thinking my driveline is bent to hell, i lay it over a straight table and both the end yokes line up perfectly laying on the table. i then look at my 3rd member pinoin yoke and that thing is pointing up, i couldn't figure out why it would do that other than it was bent. i would rotate it and it stayed in the same angle instead of point down when you rotated it.
i started looking at broken springs and etc and i find that my axle housing. i find that the forward part perches is up and point up at a 45degree angle. the perches rounded off and is sitting on the back side of the leaf spring.
i have aftermarket 5 leaf springs for springs, doetsch tech drag shocks, and of course a ford 9 inch with 31 spline axles. i also have my entire u bolt, shock mount, and everything replaced with "competition engineering" slapper bars.
the leaf spring has a bolt going down the middle of the leaf spring to hold together all the springs. well the bolt was a little bit too long so i had to trim off the extra threads to make the leaf spring fit into the hold of the slapper bar. i make it just barely fit and bolted it up. i don't know if i didn't grind it enough to where maybe the bolt was able to let the axle tidder todder or something but somehow the axle rotated forward.
i remember getting all the u joints on with an air rachet i have and then getting them all tight with a 1/2 breaker bar. the nuts are locking nuts so i don't think they backed up. on the other side of hte slapper bar is another nut to make sure the slaper bar doesn't go up either.
what do you think caused me to make the axle rotate up? i'm running a fairly mild 460 in a 73 mustang with a 5spd manual. most of the time at the track i was launching at 2000-2500rpms. most of the day i was fishtailing to the left when i launched if i launched more than 2500rpms and thats the side my car was leaning onto.
is there somekind of device to add to my year mustang to keep the axle from rotating or is it a waste with a mild motor that see's drag racing only once a month?[/QUOTE]
No matter how hard they try, "Rice Burners"cannot hide from my BBF-545 !