The 1971 Dana Track Lok is not the first choice for me. My 1971 Hemi Challenger exploded the 456 factory unit about with in a year once slicks were used. I have a 1970 B Body unit in the Challenger since 1972 with 538s not one problem with it and car turned high 9s with a 321 first gear Hemi Crash box 4 speed.If everything looks clean and correct put the dana in your car just be aware if you are hooking hard with good tires that there is a good chance that Track Lok could give you problems in the future. You got the Dana rear end so put it in your car, every Hemi deserves a Dana behind it.
You have that right Trac locks are junk with modern sticky tires. My 340 4-speed e-body 8-3/4 has slightly twisted axles, it is getting a dana powerlock out of a 67 b-body.
