My '01 Grand Marquis is factory equipped with a 3.08 conventional rear end, and I'm in the process of upgrading to a locker 3.73 with an aluminum driveshaft and an extended tail shaft housing.
I do have one concern, however. I have a slight flare when shifting from 3 to 4, and I reckon the it's probably my OD band. To be in the safe, instead of rebuilding the unit, I am considering a built 4R70W next year (capable of handling 500 RWHP) before my engine upgrades.
For the time being, I'm wondering if there be any issues with the transmission giving up after upgrading to a steeper rear end? Would I better off leaving this to after the transmission upgrade? Thanks!
I do have one concern, however. I have a slight flare when shifting from 3 to 4, and I reckon the it's probably my OD band. To be in the safe, instead of rebuilding the unit, I am considering a built 4R70W next year (capable of handling 500 RWHP) before my engine upgrades.
For the time being, I'm wondering if there be any issues with the transmission giving up after upgrading to a steeper rear end? Would I better off leaving this to after the transmission upgrade? Thanks!