a 59 w/ the stock 3.9 ratio can run 60-65 w/ no problems

considering the NAPCO's all came w/ the 4spd, and the transfer case suits that, I think it's likely you wouldn't be able to switch the setup to the 3spd - might inquire at this NAPCO site

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics