The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

RON WOODGEARD · 12-17-2004, 08:16 PM

heres what your engine is turning @ 60 MPH..

60 MPH X 1.0 tranny final gearing X 4.10 rear end gears x 336 I don't know what to call this number, it's a calculating # This total sum is then Divided by 27 tire size in inches = 3061 RPM

This formula is one that many of you may have.. Miles Per Hour X tranny output X rear end gears X 336 = ???? # then divide that answer by tire size this equals your RPM @ the speed you started with..

My point being that your rpm is always in the high range in the lower gears where a Tunnel Rams general output is.. Especially when you're "In It".

If you want to get technical,, You could take the gearing of your tranny in low (2nd & 3rd) gear and input that along with a slower speed to see what your RPM is when you shift into the different gears..

12-17-2004, 08:16 PM	#18
RON WOODGEARD Resident Young Old Dude ! Join Date: Jul 2001 Location: Nevada Posts: 1,948	heres what your engine is turning @ 60 MPH.. 60 MPH X 1.0 tranny final gearing X 4.10 rear end gears x 336 I don't know what to call this number, it's a calculating # This total sum is then Divided by 27 tire size in inches = 3061 RPM This formula is one that many of you may have.. Miles Per Hour X tranny output X rear end gears X 336 = ???? # then divide that answer by tire size this equals your RPM @ the speed you started with.. My point being that your rpm is always in the high range in the lower gears where a Tunnel Rams general output is.. Especially when you're "In It". If you want to get technical,, You could take the gearing of your tranny in low (2nd & 3rd) gear and input that along with a slower speed to see what your RPM is when you shift into the different gears..