need help with axle ratio - The 1947 - Present Chevrolet & GMC Truck Message Board Network

292farmer · 11-10-2009, 07:15 PM

i have a 1972 gmc c20 292i6 4 spd manual reg cab lwd i need help trying to figure out what my gear ratio is, i am told that it was a 4.56 by original owner i found these numbers and letters, here they are sorry some pics are upside down.
c34950 2 60-3b it has ten bolts im pretty sure its a dana 60 hence the the 60 num
i used a formula to figure out my ratio using my rpms and mph and i came up with 5.3? i thought maybe 5.13? but didnt see it as option for dana 60

11-10-2009, 07:15 PM	#1
292farmer Registered User Join Date: Nov 2009 Location: stoddard nh Posts: 693	need help with axle ratio i have a 1972 gmc c20 292i6 4 spd manual reg cab lwd i need help trying to figure out what my gear ratio is, i am told that it was a 4.56 by original owner i found these numbers and letters, here they are sorry some pics are upside down. c34950 2 60-3b it has ten bolts im pretty sure its a dana 60 hence the the 60 num i used a formula to figure out my ratio using my rpms and mph and i came up with 5.3? i thought maybe 5.13? but didnt see it as option for dana 60 Attached Images Last edited by 292farmer; 11-10-2009 at 07:22 PM.



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