5.14 ratio to 4.10 or 3.90 for 1 Ton Rear End - The 1947 - Present Chevrolet & GMC Truck Message Board Network

TreverSlyFox · 10-27-2003, 06:39 PM

My 71 GMC 1 Ton 7200 lb axle has a ratio of 5.14 and I get about a top speed of about 65 without really pushing it. I see that you can get a 4.10 or 3.90 ratio ring and pinion now for $350.

I've got a 4 speed tranny with granny 1st gear, if I made the swap what kind of top end speed could i expect? I'ed like to make Hi-Way speeds of 70-75 but which ratio will do it, the 4.10 or 3.90?

I imagine my speedo would be way off and have to be re-calibrated.

Anyone out there done the swap on their 1 Ton? Are you happy you did it?

10-27-2003, 06:39 PM	#1
TreverSlyFox Registered User Join Date: Sep 2003 Location: Houston, Missouri Posts: 17	5.14 ratio to 4.10 or 3.90 for 1 Ton Rear End My 71 GMC 1 Ton 7200 lb axle has a ratio of 5.14 and I get about a top speed of about 65 without really pushing it. I see that you can get a 4.10 or 3.90 ratio ring and pinion now for $350. I've got a 4 speed tranny with granny 1st gear, if I made the swap what kind of top end speed could i expect? I'ed like to make Hi-Way speeds of 70-75 but which ratio will do it, the 4.10 or 3.90? I imagine my speedo would be way off and have to be re-calibrated. Anyone out there done the swap on their 1 Ton? Are you happy you did it?



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