Thread: cruising rpms
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02-19-2007 09:16 PM #1
cruising rpms
I just replaced my 4.56 gears down to 3.73's. I am now at around 3500rpms at 65 mph. I was just wondering if running that high of an rpm bad for crusing on the highway and if so whats a safe distance to go driving in those conditions. It seems a little high to me but its probly cuz of my th400?
thanx
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02-19-2007 10:03 PM #2
That's still pretty high. How tall are the rear tires? I ran 3:90's in my '27, and with a 30 inch tall tire was cranking about 2500 at 65, if memory serves me correctly. (It's been 7 years)
The other factor is how much highway driving do you do? One guy in our car club was running 4:10's, and he couldn't go on many cruises with us because the r's were too high.
Don
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02-19-2007 10:59 PM #3
Cruising RPM
I had the same problem when I had my Chevy I swapped to a 700R4,dropped from 3400 @70 to 2500 picked up about 4-5 MPG.Also the 3.08 1st gear in the 700 pulled it off the line quicker.
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02-19-2007 11:00 PM #4
My 460 in my 89 truck turns about 3000 rpm at 65 and has 250000 miles on it.....C_6 trans and 4.11 gears.It was built when the speed limit was 55{it has the red number 55 on it} and at that speed the revs are about 2700 .Its gunna take longer than u thought and its gunna cost more too(plan ahead!)
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