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07-22-2021, 09:45 PM | #251 | |
Registered User
Join Date: Jan 2017
Location: Los Osos Ca
Posts: 554
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Re: Eaton HO72/HO52 vs. 14 Bolt FF
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So that really makes sense why the 3.90 exists, and is so rare. I don't think anybody has ever found evidence of Chevy offering it as a RPO (I of course could be wrong on that point). NAPCO must have had them custom made for their conversions, and then probably they or the manufacturer had some others they sold as parts for the aftermarket. This is the best theory on the subject I have come across, and it makes sense to me. What do you all think? Love to hear other opinions on this. Tom
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65 short stepside K10 292-SM420-T221 8 lug closed D44 front NoSpin HO72 4.10 rear |
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07-31-2021, 09:58 PM | #252 | |
60-66 Nut
Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,248
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Re: Eaton HO72/HO52 vs. 14 Bolt FF
The 1/2 ton NAPCO conversions used the Eaton HO32/33 both front and rear. That is what came stock in the '55 second design thru 1962 in the 1/2 tons They look just like the HO52/72, just smaller. The 3.90 gears were the most common gear found in the HO32/33's.
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10-23-2022, 01:36 AM | #253 |
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Join Date: Oct 2022
Location: Vancouver, WA
Posts: 2
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Re: Eaton HO72/HO52 vs. 14 Bolt FF
[QUOTE=jbclassix;5512266]Interchangeability... Sop far, only the brakes are interchangeable between the 14 bolt and the Eaton. I have seen a lot of requests for part numbers and how-to's for the Eaton brakes. Well, here is my how-to rebuild the brakes on the HO72 and HO52. NOTE: for the 71 and 72 HO72/52 axles this is a direct swap. 70 and earlier use smaller wheel studs and will require a hub swap, or the holes on the hub to be enlarged.
So if we were to go to, say, Napa and try to buy a backing plate, shoes, wheel cylinders to perform this swap What year would we ask for? 1973? 1974? 2WD or 4WD K20, or k30? or would any 14bolt 1973 -87 all work the same. I have a 2000 k2500 with a 14 bolt with drums would all the parts from it swap over? Seems like somewhere along the way the e-brake hook up is going to be different and so on. |
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