Dana 60 with upgraded slant six

jpl572103 said
66 dart 4 speed od transmission 225slant 2.92 diff 7 1/4. Plenty of pull and torque in 1st gear, take off is fine up to 30 mph with the 3.09 1st gear. It will squeal the right side 235 60 14 tire to death but The car has no balls from 2nd-4th gears. It's ok but it just lacks. The rpm's are slow to reach 4500. Heavy slow crank? But I think if the diff gear were lower, it would help. And the transmission is just not geared right. I know it's a truck,van transmission but its now a 66 dart transmission and I want this thing to scoot a little bit better.
It's not a higway car. Just a light to light around town car.

The OD transmission is a wide ratio trans, think of first gear like a granny gear. The drop from 1-2 is too large for a stock slant six to handle, and by the time you wind up 2nd the motor is just out of steam. It will never feel right until you put a close ratio transmission in it.

Yes, it’s got a long heavy crank, but that is not your issue. The 1 bbl carb, and stock cam are what really makes this combo stink. Adding a 2bbl carb and a cam with more than .480 lift will help, but swapping in a non od 833 will be the most dramatic change.