[Jason in TX]

I love my Volvo Overdrive.

I do love the F150 4 speed conversion and would buy one in a heart beat...

However, we did the Durango Colorado tour last year. We had the Volvo and a 1939 transmission. Other cars had the F150 4 speed.

We were passing all the cars with the F150 4 speed because we were able to split gears. We used 2nd gear with the Overdrive on going through most of the mountain passes. it was great. Lots of power, lower RPMs than regular 2nd.

I would go with a torque tube Overdrive and a synchromesh trans vs the locked in OD that the F150 trans provides.