Up Front is a super secret mega strong diff that hasn't been designed to be affordable yet... But we're working on it and it is based on a D60... Sort of a Front Sals on steroids...
Clearance wise it is only an inch lower than the Rover diff... (measured)
To put one of these in a truck would cost in the neighborhood of $2500. Thats's including everything except labor
The big ticket stuff like the locker,axles, and spindles make up for half the cost. Gears are pretty cheap as are bearings.. The housing might be had cheaper... The only custom stuff was the caliper brakets and of course the machine work on the hubs. I ditched the cheesy Sals diff cover in favor of the thicker Ford cover but by the looks of things a guy could put on anything and not worry about clearance at the fuel tank (stock fuel tank). The sals actually has a smaller projection that direction than the Rover diff..
I have been told a complete D60 weighs in the neighborhood of 325 pounds. Either the Rover Diff or the Sals are too heavy!! I'm gonna start working on RC cars from now on...
Funny the older I get the stronger Gravity gets