3.09 4 Speed Gear Set Strength

Cheapsunglasses said

I always heard the gears were fine, it was the aluminum housing and harden steel shaft with no bushings

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I heard that too. So, after a couple of years of running it, I got a machine shop to install a steel bushing in the front only. Then ran it for a couple more years. I ran that F-body box with the od gearset at some times, or with a 2.66set at other times. and eventually installed a GVod behind it. Using the GV as a splitter, that made it a 7-speed.
But I found that 7-speeds with a high-torque 367, was about 2 gears too many. So I swapped to a Commando gearset. At that time I also installed a Passon alloy box. The GV still splits the 1-2 nicely and Second-over gets me 93=6160 at the top of Second-over with 3.55s. Most of the time tho, I drive it as a 4+1..

I broke several overdrive gears, (operator error); and in one case,
I stripped all the teeth off the input gear; which is why I don't recommend that gearset for a hi-torque engine.