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09-22-2020, 04:40 PM
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#1 |
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Senior Member
 
Join Date: Oct 2014
Location: Brandon, Manitoba, Canada
Posts: 952
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4L60E + 3.42 gears
Was out for a drive and checked my speedo. It's right on comparing with my gps speed. With the 3.42 square body rear and 255-60-17 tires I'm about 1750rpm at 60mph.
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10-01-2020, 08:53 AM
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#2 |
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Roto Reuter thats the name...
Join Date: Feb 2010
Location: Darien, NY
Posts: 1,848
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Re: 4L60E + 3.42 gears
I compared my speedo with GPS too. With my K10 4l60e, 3.73 gears and 33x12.5x15 tires at 60 mph I'm about the same. Right about 1800 RPM.
__________________
~ Dan  My 70 K10 SWB build:http://67-72chevytrucks.com/vboard/s...d.php?t=782232 My 71 SWB build:http://67-72chevytrucks.com/vboard/s...d.php?t=651394 1970 SWB Fleet K10 4X4, 5.3L LM7, 4L60E, Dakota Digital RTX, Vintage Air, Ididit tilt 1971 SWB Fleet C10 - Original SWB Arizona truck, new custom restoration project "Kick out your motor and drive while you're still alive - kick it out!" - Heart 1977 |
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10-01-2020, 11:29 AM
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#3 |
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Senior Member
Join Date: Oct 2014
Location: Brandon, Manitoba, Canada
Posts: 952
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Re: 4L60E + 3.42 gears
I looked up diameters of our tires. Mine are 29", yours are much taller at 33". Your taller tires will bring the rpm down. I think we both found the right combo.
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