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Old 02-26-2014, 06:23 PM   #36
Jankovic
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Join Date: Feb 2014
Location: Ontario
Posts: 11
Re: 1978 full-time 4x4. Is a 700r4 worth it?

Quote:
Originally Posted by D13 View Post
The key is, find your motors torque curve and gear for it. ALL my trucks run 1600-1650RPM at 55 - 5.3/4L60E/3.23 3/4 ton, 4.3/700R4/3.08 1/2 ton, and 6.2 diese/700R4/3.08 1/2 ton. Any less RPM, lugs excessively. Any more, wasting fuel.

One of th rare cases where math is your friend. But be honest - if you want MPG buy a Cruze and use your truck only when desperately needed.
I'm not expecting superior fuel mileage with this truck. I just want to do whatever is cost/time-effective to try to get "good" mileage (10-14mpg). I will research the torque curve and try to optimize it that way. Like I said before, I heard that 2200rpm @ 65-70mph is ideal. By my calculations I would need 4.56 gears to do this.
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