I have a back braced 8-3/4 in my 3500 pound big block 73 dart. its got moser 30 spline axles/ spool and 4.30 Richmond gears.which after about 20 some passes has been holding up fine. with the 4.30 the car has been a best of 10.49 in the 1/4 and a 60 foot of 1.48.
now when i first put the 440 in my dart i only got to make 4 passes till the Richmond 4.10 gears went boom. i ran a 10.66 in the 1/4 but only a 1.56 60 foot. when ever i get enough money saved up i will be putting a Dana in my 73 duster. here is a pic of the 4.10 gears. thanks Mopar65