The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Something ain't right

**mongocanfly** · 06-06-2018, 05:03 PM

with 4.10s...33s...and a sm465 I'm getting 2004rpm at 48 mph....
http://www.csgnetwork.com/multirpmcalc.html
sm is 1:1ratio in 4th
nv4500 is .73 in 5th

5.13 would give you that 2500rpm at 48mph....I'd pull cover and count teeth....
once you go to the nv4500 your 48mph rpm will be 1830 and 65 or so will be back at 2500rpm
I'm betting you've got 5.13s

06-06-2018, 05:03 PM	#8
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,588	Re: Something ain't right - new gears in rear end with 4.10s...33s...and a sm465 I'm getting 2004rpm at 48 mph.... http://www.csgnetwork.com/multirpmcalc.html sm is 1:1ratio in 4th nv4500 is .73 in 5th 5.13 would give you that 2500rpm at 48mph....I'd pull cover and count teeth.... once you go to the nv4500 your 48mph rpm will be 1830 and 65 or so will be back at 2500rpm I'm betting you've got 5.13s __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver Last edited by mongocanfly; 06-06-2018 at 05:10 PM.