Well on the highway at 65 my rpm's are right at 2000 in OD, but even the slightest hill or gust of wind the right way, it downshifts... In the mud it does decent I just have to be sure to not give it hell very much or else I'd be looking at other problems. But in all honesty I could use a little peppier motor. I have to run it in 4LO to really be able to clean out the tires like they need. I would think you would be in the green with 5.38's, especially running a 40" tire.
I know that Steven(82K10SBC)The Mistress, has / or had 4.56's with his 44's but he also had a lot more ponies to spin them. I don't know how well off he was with that setup but I would think he was good. I've done surprisingly well with my setup the few times I've taken it out and my adventures are all ponds. A motor is definitely next on my list of upgrades though. Going back and forth between all out with a big block or build a stroker motor...
Yah I was just kind if curious. I really have no clue what to expect. I guess I won't know till it's all in and then ill have to adjust from there. Have to get my x over steering in, the d60 in, and then my tranny built and in.





that's just what comes to mind right now. I have lots to do