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If the NV4500 is possible (or another alternate transmission with OD), then the RPM's for 65mph would be quite happy for the engine at only around 2053rpm. I didn't say anywhere in there it would be cheap...I hope I didn't imply it. It would cost to get this motor geared to that level (the...

Educated here as well...school of building a heck of a lot of old engines up from blown to blueprint and fast. But...figured the all red blurb with the giant caps meant angry. Giant colored lettering and all caps just isn't my thing. Specifications, measurements, noting items like it having four...

so very very angry rofl

I don't disagree that they weren't built for speed to begin with :) I just think they can get there with the right modifications. On the other hand, I got really lucky with my engine, it's got pretty much perfect compression on all cylinders (140-155 across all six of them). After tuning...

I don't know about that. I've had no problems hitting 60mph in my M715 with a stock motor, trans, diff gears, hubs, etc... I know I wouldn't want to drive at 60 for any kind of distance, but in my case, the transfer case didn't even get really hot like most peoples did. Now, there may be some...

Okay, I decided to run some calculations: The high gear for the NP200 is the same as the NP205, however, there is a difference in noise (NP200=straight cut gears, NP205 = helical gears) and in heat/RPM tolerance due to the difference in gear cut and bearings between the two. Here's some...

But you should be able to change the axle gearing from a 5.87 to a 4.56, add selectros to the front hubs, put in an NP205 instead of the NP200, upgrade the brakes (remote booster will help), change to a civvy carb, change to electronic points and then get highway speeds (60-65 mph) without...