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#1 |
Registered User
Join Date: Jun 2008
Location: space station delta farce (justin tx)
Posts: 594
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65 3/4 ton questions
Okay I am really familiar with 60-66 but this is my first hd truck and know nothing other than it has a 292. My questions are what rear axle is in this thing and what is the most likely ratio? Because 3rd gear fills like first in my 66 that has 3:08s. Its has a granny 4 spd is this a sm420? Oddly enough this is my first truck 4 speed i have owned, most have had 3 speeds. the truck is almost completely factory stock with the exception of the air cleaner, tires and wheels. any way thanks for looking.
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#2 |
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Join Date: Feb 2013
Location: gulfport, ms
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Re: 65 3/4 ton questions
mine has 4.56. looks like the eaton rear. if I am correct, they were 4.11 or 4.56. also the bearings cost about 6 bills for a full set. I think mine is the HO72. I need a set of 4.11 gears and if I cant get a set, im gonna swap in a dana or corp 14.
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65 stepside C20 |
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#3 |
But Found Her 25yrs Later!
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Location: Oregon City, Oregon
Posts: 10,525
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Re: 65 3/4 ton questions
My 66 had that Eaton with 4:56.
. Don't spend the money on that rear. . If you decide to go to a 14-Bolt as I did, here is a thread: http://67-72chevytrucks.com/vboard/s...d.php?t=550878
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I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035 |
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#4 | |
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Re: 65 3/4 ton questions
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#5 |
60-66 Nut
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Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: 65 3/4 ton questions
That '72 C20 might have a Dana 60 under it, which will bolt right in under your '65. If it was a big block with auto truck it will have 3.54 gears.
Here is the for sale thread for my trailing arm mounts. http://www.67-72chevytrucks.com/vboa...d.php?t=620836
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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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#6 | |
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Re: 65 3/4 ton questions
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#7 |
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Join Date: Aug 2011
Location: Montrose, CO
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Re: 65 3/4 ton questions
Looks like the Eaton HO52 I had in mine. Most had 4.56 gears, mine had 4.11, but I replaced with a 14 bolt, using Captain's trailing arm mounts. The transmission is most likely the SM 420 with granny low first gear. Great for working around the farm, maybe not the best for highway cruising, especially if the rearend is 4.56 gears. But there is certainly some cool factor for originality, depends on how you are going to use your truck. Start with a solid plan first.
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#8 | |
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Re: 65 3/4 ton questions
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#9 |
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Join Date: Sep 2012
Location: Dallas, GA
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Re: 65 3/4 ton questions
Eaton HO52 rear and SM420 trans.
4.57:1 was standard, and 4.11:1 was optional. Check and see what you have, though; both my C30's came with later 4.10's in them. It's probably fine, unless someone ran all the oil out of it at some point. The bearings for the Eaton rears are cost-prohibitive, but I don't really see much of a reason you'd ever need to buy them. The Eaton is a third-member type rear (unlike the 14 bolt and Dana 60), so all you have to do is pop the axles out (8 bolts on both the hub flanges) and you can unbolt the old one and bolt the new one right back in. There's not a lot of demand for them in 2014, so they are normally cheap to buy if you need another. The lack of gears taller than 4.10:1 is a factor if you are doing a lot of highway driving without an overdrive, but I don't see that being any trouble if you're going to use a NV4500 OD trans. The 14 bolt is also great, but if it ain't broke... |
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#10 | |
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Re: 65 3/4 ton questions
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#11 |
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Location: Dallas, GA
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Re: 65 3/4 ton questions
How fast are you planning on cruising? I hear Tejas is pretty bad about that.
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#12 | |
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Re: 65 3/4 ton questions
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#13 | |
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Re: 65 3/4 ton questions
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I actually drive 70 sometimes (when traffic dictates) and go 65 frequently on longer trips.
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1965 C30 pickup 350/SM420/4.10's (daily driver) thread 1968 Impala 4 door sedan (future driver project) thread Last edited by 66Submarine; 09-01-2014 at 09:19 PM. |
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#14 | |
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Re: 65 3/4 ton questions
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#15 |
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Join Date: Sep 2012
Location: Dallas, GA
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Re: 65 3/4 ton questions
235/85R16 on the back and 245/75R16 on the front. About ten over is kind of average around here IME.
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