Anyone changed their rear end for more towing capacity?

If its 4WD you'll need to change both axles. Forum member crappiefisherman changed the axles on his V-10 Excursion from 3.73 to 4.30 and it made a big performance difference towing in the mountains out west.

In your case, a 3.08 rear axle is really high....3.42 is better, most "tow" vehicles are 3.73 or 4.10 but not sure that you need to go that low with a 6 speed transmission.