The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 55.2-59 another gear ratio question with a bbc

burnin oil · 12-23-2021, 12:08 PM

I drove a 76 blazer with the 465 and a 400sb for years that had 3.07 gears. It worked fine, even with 31" tires. The only thing to remember is that there is a 50% drop in rpm between 2nd and 3rd so the motor has to have a little Rev to it. I never understood people's hatred of them. The 420 and 465 transmissions are about bomb proof and scattering a trans sucks. I also did haul the farm tractor a few times with that truck. No problems

Both the 420 and 465 are synroed in 2, 3, and 4 but 1st and Rev are not.
Nv4500 is about the same as above only adding OD. I really like them but are not really worth the extra money. I do have one in my 72 k20 that has 4.10s.

12-23-2021, 12:08 PM	#11
burnin oil Registered User Join Date: Jan 2013 Location: Eastern TN Posts: 1,921	Re: another gear ratio question with a bbc I drove a 76 blazer with the 465 and a 400sb for years that had 3.07 gears. It worked fine, even with 31" tires. The only thing to remember is that there is a 50% drop in rpm between 2nd and 3rd so the motor has to have a little Rev to it. I never understood people's hatred of them. The 420 and 465 transmissions are about bomb proof and scattering a trans sucks. I also did haul the farm tractor a few times with that truck. No problems Both the 420 and 465 are synroed in 2, 3, and 4 but 1st and Rev are not. Nv4500 is about the same as above only adding OD. I really like them but are not really worth the extra money. I do have one in my 72 k20 that has 4.10s.