Gear ratio questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

my90k5 · 07-29-2010, 01:24 AM

Hey Patriot, I'm in the same boat. I have the SM465 and switched to a 31" tire. I haven't installed a tach as of yet to determine my RPM's on the freeway but they are somewhat low. I also play shifting games during my daily drive to work. My truck has the stock 3.08 gears and I plan to switch those out for the 3.73 gears.

Here is a link I'm using to determine my desired RPM range. 2400 - 2600 seems to be a good highway RPM.

Gear Ratio Chart

07-29-2010, 01:24 AM	#8
my90k5 72 K/5 Junkie Join Date: Feb 2010 Location: Western PA Posts: 453	Re: Gear ratio questions Hey Patriot, I'm in the same boat. I have the SM465 and switched to a 31" tire. I haven't installed a tach as of yet to determine my RPM's on the freeway but they are somewhat low. I also play shifting games during my daily drive to work. My truck has the stock 3.08 gears and I plan to switch those out for the 3.73 gears. Here is a link I'm using to determine my desired RPM range. 2400 - 2600 seems to be a good highway RPM. Gear Ratio Chart __________________ 72 k/5 CST 350 SM465 NP205 My Build Progress



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