3.54's and 38's - need some thoughts

["Mad Max"]

...okay, okay...before y'all think I'm looney, read the whole thing

The Truck: '78 Ramcharger (ridiculously modified) - 6BT Cummins, 518, 203/205 doubler, D60/D70, 3.54's.

Currently I've got 35's, and it was built that way with a big block, 727, and a 205. Worked well enough, but I decided to upgrade to the 6BT, 518, and doubler. So now I've got double the torque and double the gear reduction. With the Cummins I've also now got a heavier truck, to the tune of about 7000 lbs total. And now...the 35x12.5's are, well,....small.

I'm getting bigger tires either way, and with the 6BT I know the truck won't hate the 38's with the 3:54's. My question is....and please 'dig' my meaning....will I need to upgrade to 4:10's sooner....later.......or at all????

I'd love to do 4.10's now, but can anyone out there in off-road land give me some 'reasurrance' that I'll at least, for now, enjoy the 38's for at least one season?

Engine power output will be +/- 300 hp and 600 tq in the end. Tranny is fresh with hard core 6BT rebuild (converter, v-body, kit).

Also, my '93 Ram has 3.54's and 35's and it loves 'em. 38's are a little taller but not a huge, so I know the hole shots may feel a bit slower but I'm guessing with a nice fresh tranny it'll feel purty sweet on the highway, and the highway is one of this rigs' primary play grounds. Add the doubler (4-1 ratio) and I feel it'll crawl pretty good too. It's being built to cruise as easily as it crawls.

See I'm not so crazy after all.........right?

- Sam