47-55.1 51 Chevy 3600 Differential/Center Section Options - The 1947 - Present Chevrolet & GMC Truck Message Board Network

agraff · 02-21-2026, 04:05 PM

I have a 1951 Chevrolet 3600 with an Eaton HO52 rearend (8 lug axles, 4.56 gears). It has an open driveshaft (no torque tube). I would like to keep as much original equipment as possible so I’m looking for options for a direct differential/center section swap that can get me 4.11 gears or lower to help with cruising speed.

I have heard that the 67-72 C/K 20 models should be a direct swap, anyone know of other options to get me a little better gear ratio?

02-21-2026, 04:05 PM	#1
agraff Registered User Join Date: Jan 2024 Location: South Dakota Posts: 1	51 Chevy 3600 Differential/Center Section Options I have a 1951 Chevrolet 3600 with an Eaton HO52 rearend (8 lug axles, 4.56 gears). It has an open driveshaft (no torque tube). I would like to keep as much original equipment as possible so I’m looking for options for a direct differential/center section swap that can get me 4.11 gears or lower to help with cruising speed. I have heard that the 67-72 C/K 20 models should be a direct swap, anyone know of other options to get me a little better gear ratio? Last edited by agraff; 02-21-2026 at 05:03 PM.



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