Yeah, the low range is really very low in these. I wouldn't use low range unless you're towing a REALLY heavy trailer up a long steep incline. Put it in low, tow slowly up the hill, take it easy and go slow, then put it back in high range when you're at the top.
Whatever the top speed is doesn't matter. I wouldn't sustain more than 3-4000rpm for a long time. That's only going to get you... I dunno, 25mph? Just my personal feelings on that.
If you're towing up something that steep, and want to go that slow, if it's not a 4 lane road, you're going to piss off a lot of people stuck behind you.
How heavy is the trailer? If it's not more than 5000lbs, I'd just leave it in high range, make sure the trans is in 3rd, and just take it easy. The important thing is you just don't want to be higher than half throttle for a long time. It's hard on the engine, and really heats up the trans fluid. If you're needing more than 1/2 throttle to go up at 30-40mph, it's slow down and then drop into low range and keep the speeds even lower. Again, you'd have to be towing a HELL of a load for this.
It's just something you have to feel out.
Edit: Yeah, I agree with Mike, even using 2nd in high range and going slow makes more sense than dropping it down to low range. And watch your gauges for overheat. I believe there is a trans temp sensor that will trip a light, Mike? If the engine is overheating, stop IMMEDIATELY, soon as it safe that you won't get killed. If you overheat this motor, you will ruin it.
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