From what Miker says I may need to go with a smaller tire and narrower wheel. Most advice I see says not to mix radials and bias tires. I’m planning on using radials. They are for dead strip. I won’t be driving them on the street. 

I didn’t mean to sound discouraging. Just what I’ve got and what I’ve measured. You going to be running heads up, or bracket? Lowest/fastest time or consistently? Having a little more room to work the suspension might be necessary. As an aside, when I had the leaf springs, posi, 5” wires, stock size radials, and original Traction Masters, the car planted and left pretty nice. Of course in Seattle, that often meant on a damp road. LOL


miker
55 bird, 32 cabrio F code
Kent, WA
Tucson, AZ

Miker, are your Traction Masters welded or bolt-on? My dad had bolt-on Traction Masters on his 55 Tbird (now mine). He was no hotrodder. It's possible that the previous owner had installed them, and my dad left them. When my dad bought it in the early 70s, it was riding on Chrysler Kelsey Hays spoke wheels and 60-series tires. An extra leaf had also been added to the worn-out springs. It's also possible that the Traction Masters were added to control the lateral movement of the rear axle, because the knockoffs of the later Coker poke wheels were making contact with the fender skirts. My dad tried 2 different sets of skirts but could not solve the problem, so he removed the skirts.

The chrome traction bars were too obvious for me, so I had them powder-coated 20% gloss black. My car is also riding on new General Spring rearched leafs/w 1-inch lift, Bilstein shocks, Hotchkis tubular sway bar, and 215/70R15 Goodyear radials. There's a limited-slip differential in the rebuilt Dana 44. Unfortunately, I'm still working on the car, so I haven't put the combination to the test.  

I called Traction Masters back in 1999 or 2000, and they told me they still had the pattern for the “birds. Mine bolted on the U bolts, and had a welded bracket on the front. Took a while, they made them up special. Chrome, iirc. I removed them when I put the 4 bar in, and gave them with a friend with a 57.

miker
55 bird, 32 cabrio F code
Kent, WA
Tucson, AZ

Mine bolt on front & rear/w front mount sharing a bolt hole with the front spring mount. I think the front bolt-on is an exception to most that are weld-on. I ordered a set of replacement bushings from Traction Masters. One of the bushings did not fit, so I had to reuse one of the originals. 

In case I didn't already mention it, my aftermarket cast wheels are 15 x 7/w 3.875 backspacing (no slicks, not even cheaters). 

Traction master is still around, I think in Burbank CA.
I welded the TM front mount on my 54 Ranch Wagon. Rear of course using long U Bolts. Leaf springs  disassembled and rear arc, Ford Maverick 8”with limit slip.