[jeffahart]

Nice truck, looks like a keeper. You know, you got me thinking. I'm not sure gears are your issue. You may just have noise that you think are high Rs. Mount a cheap tach onto your steering column. Like said already above.

Plus... do you by chance have a flex fan? They are noisy junk that sound like high Rs. If that's the case, you may just need to get a proper clutch fan and do some re-insulating. These two things could make you a happy camper.