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#1 |
Registered User
Join Date: Aug 2016
Location: Guthrie, OK
Posts: 44
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Drilling C30 dually hubs for 5 x 8" wheels
Sorry for the long post.
I have this really cool 1949 Studebaker 1.5 ton farm truck. I use it regularly. I have posted a few times over the last 7 years in the “heavy haulers” section, mainly because I replaced (engine swap) the old flat head six (96 hp when new) with the engine and trans out of a 1972 C50. Could not be more pleased with the swap. The rear axle is a 6.66 gear. My five speed is NOT the OD model. That means, even with tall 235 80 17 tires I am spinning at 5200 RPM just to go 70 miles per hour. Low gear is virtually useless. I normally start out in 3rd without a load, and even with a load, unless I am going uphill. I have a chance to purchase a 4:10 rear axle assy out of an 80s C30 dually. If my calculations are correct, a 4:10 rear with the same tires would get me right at 3200 RPM at 70 mph. Quite the improvement. Getting ready to call the seller and get all the measurements to make certain I can make it work. I am adept at fabrication, so no worries there. Just need to make certain the flange to flange measurement is in the ball park. Doesn’t have to be exact, as it is a flat bed (actually a dump bed, and it still works, which is GREAT when I haul a load to the dump. Don’t even have to get out of the truck. I REALLY want to keep my wheels. I know the easiest thing to do would be purchase four 17 inch dually wheels in the right size, which I BELIEVE is 8x6.5" Bolt Circle with 4.56" Center Bore. But then I have to carry TWO spares, one for the front and one for the rear. Also, finding that lug pattern in a 17 is a challenge. Most are 16s, and I can’t do that as I have six almost brand new Michelins (take offs from a 3500HD) on the vehicle right now. Chevy bolt pattern: 8x6.5" Bolt Circle with 4.56" Center Bore Studebaker bolt pattern: 5 X 8" Bolt Circle with 6.050 inch Center Bore What I am wanting to know is if the hubs on the Chevy rear can be drilled for 5 x 8" bolt circle. I am not worried about the difference in bore size, as I can have hub centric rings fabricated to make certain the wheels are centered. Anyone have hubs bored for a larger bolt circle? Is there even enough extra metal to go 8 inch? Thanks in advance for any help. |
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#2 |
Post Whore
![]() ![]() Join Date: May 2015
Location: Alabama
Posts: 14,634
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Re: Drilling C30 dually hubs for 5 x 8" wheels
without pulling a wheel off, i dont think the C30 has enough hub for a 8in bc
also theres 2 diff widths of axles for a C30..theres true dually and the narrower cab&chassis you might could pull it off with "custom" adapters...
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Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver |
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#3 |
Registered User
Join Date: Jul 2018
Location: Catskill Mountains,NY
Posts: 8,471
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Re: Drilling C30 dually hubs for 5 x 8" wheels
My uncle had a 47 Studebaker tow truck . It had a two speed rear in it not sure if it was factory or if he did the swap . But since he was a Studebaker dealer I assume he ordered it that way
Do you belong to the Studebaker Drivers Club ? If not I would look into it as there is a wealth of info from them
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Mark 72 c20 custom camper Husky edition, 66 SS396 Chevelle 1964 Hawk, 63 Avanti,62 lark 1969 AMX , 1968 c20 stepside ,85 K20 1977 Suburban sold 68 anniversary. |
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#4 |
Registered User
Join Date: Apr 2012
Location: Chatt Tn
Posts: 969
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Re: Drilling C30 dually hubs for 5 x 8" wheels
what about the 92-2000 3500hd setup? they ran a dana 80 with a 10lug in the rear and only used 5 lugs in the front. some motor home chassis used the same wheels.
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88 military v30 crewcab shortbed 5.9 cummins, nv4500, 205 86 k30, 89 diesel burb, 76 gmc pathfinder 71 longbed 5.3 4l80 http://67-72chevytrucks.com/vboard/s...d.php?t=522535 |
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#5 |
Registered User
Join Date: Aug 2016
Location: Guthrie, OK
Posts: 44
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Re: Drilling C30 dually hubs for 5 x 8" wheels
Yes, I am on the Studebaker forum. Great folks on there always willing to help. Precious little info on the big trucks though. I have not been on the Studebaker truck forum in a few years. I can't get to it for some reason. Keep getting diverted to a talpatalk website.
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#6 | |
Registered User
Join Date: Aug 2016
Location: Guthrie, OK
Posts: 44
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Re: Drilling C30 dually hubs for 5 x 8" wheels
Quote:
It was a diesel with a five speed with O/D. That meant to trans would be a direct bolt in (one inch input shaft) for the five speed NP trans I currently run. It had not run in 7 years but cosmetically was in outstanding condition. When they guy found out I was planning to part it out, using the trans and possibly the rear on my Studebaker he backed out. Couldn't stand the thought of his truck getting cannibalized. |
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#7 |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,522
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Re: Drilling C30 dually hubs for 5 x 8" wheels
I'd be looking for the 2 speed rear and an over/under drive like a spicer unit
https://6066gmcguy.com/spicer-5831-b.html or a brownie box of the same https://www.bigmacktrucks.com/topic/...speed-brownie/ |
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#8 |
Registered User
Join Date: Aug 2016
Location: Guthrie, OK
Posts: 44
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Re: Drilling C30 dually hubs for 5 x 8" wheels
Most of the two speed axles from that era are low and lower.
Really would prefer the simplicity of a 4.10 unit. |
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#9 |
Registered User
Join Date: Apr 2012
Location: Chatt Tn
Posts: 969
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Re: Drilling C30 dually hubs for 5 x 8" wheels
you can find a rearend on car-part.com. it lets you search all the junkyards for what you need.
__________________
88 military v30 crewcab shortbed 5.9 cummins, nv4500, 205 86 k30, 89 diesel burb, 76 gmc pathfinder 71 longbed 5.3 4l80 http://67-72chevytrucks.com/vboard/s...d.php?t=522535 |
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