Upgrading my 302v8 - need engine advice

[Timmy390]

I had to go 4:11 with my AOD and 31 inch tires. Was lugging the engine at 65mph in OD.

I too run 4:11's but with 33's. Can cruise along the backroads in 5th at 45mph and still not be lugging. Of course the warmed over 351w with low end torque cam help

Tim

 

[Broncobowsher]

I too run 4:11's but with 33's. Can cruise along the backroads in 5th at 45mph and still not be lugging. Of course the warmed over 351w with low end torque cam help

Tim

Sounds like a manual transmission. Generally a lot less overdrive that the automatics. The AOD is a really tall overdrive 0.667 which will give a set of 4.11 gears an effective ratio of 2.74, The 4R70W is a little less overdrive, an effective ratio of 2.88
Those are good choices for a car, not a tall tire (compared to a car) Bronco that has twice the drag going down the road.

 

[73azbronco]

if you are lugging the motor, you need to downshift, and slow down. I grew up with 45mph uphills.