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#1 |
Registered User
Join Date: Apr 2018
Location: Reno, NV
Posts: 4
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63' Chevy C30 Dually Rear End Identification
Hey guys, I have a 1963 Chevy C30 Dually that I want to swap the ring and pinion out of. We did the "turn the tire twice and count how many revolutions the driveshaft makes" and found it has somewhere around a 5.13 gear ratio in the rear. The truck motor screams at 4,000rpms at 70mph. I want to buy a set closer to 3.23 that will take the rpms at 70mph down to a more acceptable 2500rpm. Trouble is, my dad swapped multiple rear ends in and out of this truck back in the 80's and has no idea what rear end it's running now. I found a stamped number of 3766686 with a "D" under it on the rear end but haven't had much luck with google searching. I would like to order a gear set on Amazon if possible. Any help is appreciated. Thanks in advance.
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#2 |
Registered User
Join Date: Feb 2016
Location: Georgetown, TX and Bragg Creek, AB
Posts: 172
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Re: 63' Chevy C30 Dually Rear End Identification
I am not an expert but it looks like a HO52...
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#3 |
Registered User
Join Date: Feb 2016
Location: Georgetown, TX and Bragg Creek, AB
Posts: 172
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Re: 63' Chevy C30 Dually Rear End Identification
If it is a HO52, parts are expensive and the best you'll do gear wise is 3:90.
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#4 |
Registered User
Join Date: Jan 2017
Location: Los Osos Ca
Posts: 548
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Re: 63' Chevy C30 Dually Rear End Identification
You have a 5.14 ratio. Your rear is an HO52 or more likely HO72 (center section is interchangeable between the two). The only other ratios available are 4.57 and 4.11. You will have to find a used one. Best place to find a 4.11 is in a late 60's early 70's truck,
Good luck, 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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#5 |
Registered User
Join Date: Apr 2018
Location: Reno, NV
Posts: 4
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Re: 63' Chevy C30 Dually Rear End Identification
Thanks so much guys. I'll try to find out how much I can get a set of 4.11's for it. 4.11's would drop the rpm at 70mph from 4000 to 3200. Might be worth it if I can get the gears cheap enough.
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#6 |
Registered User
Join Date: Jan 2017
Location: Los Osos Ca
Posts: 548
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Re: 63' Chevy C30 Dually Rear End Identification
Looking at the picture closer, center section does look like an HO52 as Nanook said. If truck is original 1 ton the housing probably an HO72, but really does not matter as all interchangeable. Only difference is bearings in the center section, which are mostly available , but as mentioned, not cheap. Heard rumors of 3.90 ratio for years, but never actually seen one, so not going to say for sure ether way.
__________________
65 short stepside K10 292-SM420-T221 8 lug closed D44 front NoSpin HO72 4.10 rear |
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#7 |
Check The Champ, Demonstrator
![]() Join Date: Jun 2009
Location: Montreal,Quebec
Posts: 6,627
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Re: 63' Chevy C30 Dually Rear End Identification
__________________
1963 Chevrolet Truck Literature LINK: https://picasaweb.google.com/113840717762774560215 YouTube Channel with 20+ Original Chevrolet Truck Salesmen, Mechanics & Service Department Training Slideshows. https://www.youtube.com/results?sear...otruk63&page=1 |
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#8 |
Registered User
Join Date: Apr 2018
Location: Reno, NV
Posts: 4
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Re: 63' Chevy C30 Dually Rear End Identification
Thanks Short, after mulling it over more, I really want to get down to around a 3.23 vs 3.90 or 4.11 for cruising on the highway. I'm thinking of just switching out the entire rear end for something more appropriate for what I need. Hopefully I can find something in the junk yard. Might be able to make up the loss a little by selling this rear end on Craigslist to the rock crawler guys for a couple hundred bucks.
Aero, I see you posted something but I can't view it. It just has a little square with an "x" in it. ![]() |
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#9 |
Senior Member
![]() Join Date: Aug 2011
Location: Reno, Nv.
Posts: 1,433
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Re: 63' Chevy C30 Dually Rear End Identification
Have you checked into a Gear Vendor overdrive? That's probably what I'm going to do my 64 C30, it has 5.14 ratio. Truck looks good, have to get together.
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1927 Willy's Knight 24,000 original miles, 1958 Impala 283/Powerglide, 1964 C-30 383/4 speed, 1971 Monte Carlo 350/350, 1972 GMC K2500 350/350, 1976 Chev. K10 350/350, 2006 GMC Sierra 2500HD LBZ Duramax/Allison, 2006 Chev. Silverado K3500 LBZ Duramax/Allison |
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#10 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: 63' Chevy C30 Dually Rear End Identification
The only way you are going to get a gear higher than 4:11 is to change the entire differential. Personally that's what I would do regardless. The last time I bought the one pinion bearing it was about $240. And that was over 25 years ago. Finding a 10.5" 14 bolt with 3.73 gears isn't too difficult. With a Dana 60 or 70, you can get 3.54 gears.
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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#11 |
Registered User
Join Date: Jan 2013
Location: Calgary Alberta
Posts: 1,166
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Re: 63' Chevy C30 Dually Rear End Identification
With 5.14 gears wouldn't the driveshaft speed be a little excessive at 70MPH?
This happened on an empty Kenworth gravel truck but I saw a drive shaft come loose and trash the hydraulic tank after the driver threw it into neutral down a long steep grade. |
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#12 |
Registered User
Join Date: Feb 2015
Location: Montevallo, AL
Posts: 272
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Re: 63' Chevy C30 Dually Rear End Identification
Look for a 14 bolt rear. You can probably find one that will match the spring to spring distance on yours. However, you may have to shorten your drive shaft. That is all I had to do when I swapped.
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#13 |
Registered User
Join Date: Jan 2017
Location: Derby Kansas
Posts: 366
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Re: 63' Chevy C30 Dually Rear End Identification
i have a 62 c30 that i just swapped out the Eaton for a 14 bolt out of a 1981 one ton with 4.10 gears, bolted directly in.
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#14 |
Registered User
Join Date: Feb 2007
Location: west coast
Posts: 3,370
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Re: 63' Chevy C30 Dually Rear End Identification
A 4.10 Eaton pumpkin is the easiest and cheapest swap ( just need to find one for a C 30, however I've heard C 20 pumpkins, much more plentiful, are the same), no modifications will be necessary, except the speedo will be slightly off. As Short 3/4 ton mentioned, much more common in 69-72 C 20's with V8 automatic, harder to find in any other model. Never seen or heard of the mythical Eaton Ho52 3.90. The good news about a complete rear axle swap to a higher ratio is your truck has leaf springs, which are used on all newer 1 tons. ( IMO 3.73 would be best, any higher ratio 3.20-3.50 you'll loose pulling power in a heavy truck)
Last edited by factorystock; 04-07-2018 at 02:50 PM. |
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#15 |
Registered User
Join Date: Jan 2017
Location: Los Osos Ca
Posts: 548
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Re: 63' Chevy C30 Dually Rear End Identification
This is the ultimate setup. You keep the low gears for heavy hauling, but still have OD for the Hi Way. Plus you can split the gears on that wide ratio 4 speed, giving you 8 forward gears.
__________________
65 short stepside K10 292-SM420-T221 8 lug closed D44 front NoSpin HO72 4.10 rear |
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#16 |
Registered User
Join Date: Apr 2018
Location: Reno, NV
Posts: 4
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Re: 63' Chevy C30 Dually Rear End Identification
Would love the Gear Vendors set up for the Muncie 4spd I have. But $3,000
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#17 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: 63' Chevy C30 Dually Rear End Identification
You could change to a NV4500 for about half of that cost. And change the differential for a bunch less than that.
__________________
Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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#18 |
Registered User
Join Date: Jul 2018
Location: Colorado Springs, CO
Posts: 1
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Re: 63' Chevy C30 Dually Rear End Identification
If my information is correct, the 3.90 gear was only used one year, 1955 and only on Napco front axles. The reason, I believe is that in 1955, Napco did not have a half ton axle ready for the 4x4 conversions, but they did have a 3/4 ton axle with 8 lugs. This axle was based on the HO52 housing used in the 3/4 ton trucks from the factory. It used the same Eaton drop out. The trucks came with 3.90 gears in their half ton rear ends. As a stop gap until their 1/2 ton front axle was ready, the Napco Power-Pak was shipped with a 3/4 ton front axle with 3.90 ring and pinion installed to match the 1/2 ton rear axle in the truck. They also included a set of wheel adapters, so the owner did not have to carry 2 different spare tires. In 1956, Napco had their 1/2 ton front axle ready and that was used on all 1/2 tons until 1960, when GM redesigned the front suspension and installed their own "corporate" 4x4 system. I don't think they actually built the axles and transfer cases, but they were installed on the assembly line, and were not converted 2wd pickups. Until 1957, all Napco 4x4 conversions were done by the owner of the truck and at dealers. After 1957, Chevrolet installed the Napco conversion at the factory through 1959. So, as far as I can tell from bits of information here and there, the 3/4 ton Napco front axle is the only place you would ever find a set of 3.90 gears.
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#19 | |
Registered User
Join Date: Mar 2010
Location: thomastown mississippi
Posts: 1,261
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Re: 63' Chevy C30 Dually Rear End Identification
Quote:
Kinda xample of what I' talking about is like a Fuller 13 spd & a 15 speed. The 13 spd has two ranges, and you split the last 4 gears, all progressive & only use 1st once. However the 15 spd has 3 ranges & 15 forward spds, but you shift it either 3-5-5 or 5-3-5, so it only has 13 PROGRESSIVE speeds. |
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#20 | |
Registered User
Join Date: Jan 2017
Location: Los Osos Ca
Posts: 548
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Re: 63' Chevy C30 Dually Rear End Identification
Quote:
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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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c30, chevy, dually, gear, ratio |
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