No traction and wheel hop is controlled? I’d actually had a lot of ‘fun’ with this scenario over the last 2 years, lots of folks used to the more forgiving, current rear Coilspring Suspensions, Factory 3 links, are getting a dose of how precarious Leaf Spring
Suspension can be, lol. .
Had 4 1/2 leafs on my 69’. Stock ride height, standard eye. Bought them from Mustangs Plus over 15 years ago. It launched great with the 4-1/2 when the car was an automatic, but after I swapped in the Toploader I had tons of wheel hop. Car had an Auburn Pro differential and not an open diff. .Cured it with some Ladder bars, went to
Calvert style bars. I kept spending more and more money, was beginning to cut up a Classic. I’d backed off and started restoring Originality and found a Foxbody to Build...
A lot of good
Suspension Parts from the below, and also ‘Chassisworks’.
Both sites have great products right up your alley. Theirs is listed as Total Control Products. I did not want to go with any sort of traction bars on my car, so i was stuck with spring upgrades and I didn’t really want to go to 5 leaf, so 4.5 Leaf ended up as the right choice for me, they’re solid, and allowed me to really dial in my launches...If not for you, there’s also 5 leaf setups..
Both sites have been around for a while, reputable & have many
Suspension goodies... I’d setup my buddy’s most current 351C 68’. It was having issues like yours, cured by running an MP 4.5 leaf setup, adjustable Koni’s.
It’s around 400bhp., 3,400lbs.
Hope that helps, let me know if you need more info. Cheers! John