The Stovebolt Site Forums The Shop Area General Truck Talk rear end question

I have a 49 1-ton pickup, I switched the 5.14 to 4.56 The engine sounds like it's screaming at 50 M.P.H. I need to go with a 4.10 or 4.11 I've heard I can get this from a 72 3/4 ton chevy, What other years had this rear end? Thank you. Terry

The years are 1967 to 72 with an automatic. IThe ratio you want is 4.10.

Thank you Fred, Now I can start looking. Terry

Correct me if I am wrong but I do believe you are looking for a 4:11 gear set. 37 tooth ring gear, 9 tooth pinion. If you will send me an e-mail address, I will send some pictures of the gearset with Part number and ratio info from one.

It would be 4.10 with the HO52/72. The 4.11 ratio was in the Spicer 70, standard in GMC, optional in Chevrolet, used mainly with the leaf spring option.

Longbox, I beg to differ with you. I have sent you pictures. 4:10 4:11 Eaton Ho52 Eaton Ho 72, Spicer 70 Dana 70 Dana/Spicer 70 , There are differences. One fits 1947 thru 195? 3/4 -1 ton Eaton axels, the other does NOT. Most Eaton 3rd members from a 1967 thru 1972 with an auto tranny fits our 1947 thru 195? rear axels. Dana /Spicers DO NOT! Dana/Spicers are an entire different shape than Eaton. NO WAY you can fit that into an Eaton Axel! The Eaton 4:11 3rd has 37 ring gear teeth and 9 pinion gear teeth. The last time I divided 37 by 9 = 4.111111111111111 ect. Does the Dana/Spicer have 41 ring /10 pinion teeth? that would equal 4:10. To make a Dana /Spicer work , you would have to change out the entire rear axel. Correct me if I am wrong and I will eat6 my words plus my entire rear axel from my 51 chevy 1 ton. Respectfully submitted, Jerry

GM lists it as a 4.10 on the Heritage site specs, all the spec guides show it that way as well. Could be that it really is a 4.11 in both (give or take), and GM listed them as a "4.10" and "4.11" to differantiate between the them in the specs.