My son's 2000 Dak on the rear when we measured it shared the 43" perch centers same as a d150 & the A-body.

since I had my 88 d100 tubbed with the A-body 8 3/4 tucking 12" wide 4.5 backspace 29x15x15 M/Ts in the fenders with tubs flush with the frame. works on the DAK and the stock swaybar even works out bolting up.(DAK rear SB fits D100/150 truck chassis as a bolt on mod with the A-body 8 3/4.

when we were looking it was the B-body 8 3/4 that was the most popular swap for 10" rims less tub work.

after all Robert, you are the man when it come to narrowing a 8 1/4 rear axle in the driveway by hand when everyone said you can not do it that way. yes sir, I remember that well.

I would think a DAK with a 440 would need a set of fatty's and a good A-body 8 3/4 & Moser axle package.