this is a repost from the 80's section... the full thread can be read here:
Just had the truck re-geared to 4.88s. I am currently running 315 Nitto Terra Grapplers. I am in Mass, at or just above sea level. There are no engine mods to the truck, I run it with an ARB bumper, IPOR rear bumper and loaded with tools (to give you an idea of the added weight). I run 87 octane (Mobile if it makes a difference) and the PWR button was not on.
these were my results driving home last night. all results are GPS measured:
total miles = 30.82
gallons burned = 2.14
MPG = 14. 4
this was cruising on the highway between 70 - 85 MPH
https://forum.ih8mud.com/showthread.php?t=176784
these were the speed measurements:
RPM..........Speedo Measurement.....GPS Speed Reading
2,250........65...............................60.5
2,400........71...............................65
2,600........75...............................70
2,800........81...............................75
3,000........?.................................80
overall, the truck feels MUCH more responsive and most importantly to me, it does not constantly have to downshift up hills on the highway. cruising at 65 is a breeze. The shift points feel the same as if the PWR button was on and I had the stock gearing. I will have it in 4low this weekend out on the sand. I can't wait to see how that feels.
I would recommend this to anyone with 35s and an 80 series.
Just had the truck re-geared to 4.88s. I am currently running 315 Nitto Terra Grapplers. I am in Mass, at or just above sea level. There are no engine mods to the truck, I run it with an ARB bumper, IPOR rear bumper and loaded with tools (to give you an idea of the added weight). I run 87 octane (Mobile if it makes a difference) and the PWR button was not on.
these were my results driving home last night. all results are GPS measured:
total miles = 30.82
gallons burned = 2.14
MPG = 14. 4
this was cruising on the highway between 70 - 85 MPH
https://forum.ih8mud.com/showthread.php?t=176784
these were the speed measurements:
RPM..........Speedo Measurement.....GPS Speed Reading
2,250........65...............................60.5
2,400........71...............................65
2,600........75...............................70
2,800........81...............................75
3,000........?.................................80
overall, the truck feels MUCH more responsive and most importantly to me, it does not constantly have to downshift up hills on the highway. cruising at 65 is a breeze. The shift points feel the same as if the PWR button was on and I had the stock gearing. I will have it in 4low this weekend out on the sand. I can't wait to see how that feels.
I would recommend this to anyone with 35s and an 80 series.
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