Quote Originally Posted by greenmeanie View Post
The 292 is a torque mill with the peak way down the RPM range compared to a V8. As such you want to gear it for somewhere between 2200-2400rpm at 65mph.

exactly:
1966 GM truck repair manual,power ratings: 292 inline 6 has 170 hp at 4000 rpm and 275 fbs of torque at 1600 rpm.283 V-8,175 hp at 4000 rpm,275 ft lbs of torque at 2400 rpm. Your gearing philosophy has to consider that difference. Highway performance expectations are different too so period gearing (On GM/Chevy P/Us may or may not work- OTOH With an overdrive it probably will.

[edit] Most of you know this but it is probably worth mentioning for those less accustomed to Land Rovers. In a LR high range ratio is something of a underdrive*- so comparison with other trucks ring and pinion ratios should take that into account. A 199Range Rover with 3.54 diffs also has a 1.22 High Range ratio and is like driving around with 4.3 diffs in an American car. A Series Land Rover with 4.7 diffs has a 1.15 high range ratio so they are like 5.4 diffs in a US vehicle.

* Some people like Teriann, Greenmeanie, and Mercedes Jim have the Ashcroft High Ratio Transfer Case (HRTC) that does the exact opposite- it is effectively an overdrive. http://www.ashcroft-transmissions.co...-case-kit.html