Dana 60, C-20 vs C-20 Longhorn - The 1947 - Present Chevrolet & GMC Truck Message Board Network

da-burb · 05-15-2002, 04:24 PM

I believe there are pins on the axle tube that register the axle to the leaf spring pack. Has anybody gone from the wider 2wd to the narrower 1 ton Longhorn and 4x4 frame dimension? What is involved?

I have a friend that wants to put one of my Dana 60's with 3.54 gears under his Longhorn instead of the Eaton with the screaming engine gear ratio. His 454 would be much happier.

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1971 C-10 Suburban
1972 C-10 Suburban
1969 XL Galaxie Fastback
1968 Galaxie 500 Fastback
1974 SCOUT II

Montrose, Minnesota

ckhd · 05-15-2002, 05:32 PM

"Screaming engine gear ratio" - funny! I have one of those in my '68.

I haven't done the conversion yet, but I plan on a Dana 70 conversion. It will require leaf spring pads welded on (I'm pretty sure you can get them at Summit). I don't know if the brake hoses have the same size fittings or not.

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Bowen
'68 K20 fleet
'69 K10 swb fleet
'72 C10 lwb step
'72 K10 Suburban

DennyB · 05-15-2002, 06:26 PM

da-burb,
I cant help you, with your question but I learned something as of late that may help.
There is a company that rebuilds the corporate nodular sections.
Apparently there is a demand for that 10 bolt with a 10"+ ring gear:O
They make a higher gear (3.something,,3.7? maybe). This may help with the screaming 4.57+- gears and would be a quicker install.
I can find out more info if you like.
If your intrested e-mail me.

Scrub · 05-15-2002, 08:36 PM

I just put a corp-14 under my 72 4x4.
I took the axle into to a local welding shop and had them air-arc the spring pads off. as it turned out the shock mounts where different also so I should have had them done to. Cost 30 bucks.

After that I just lined the same spring pads up so the axle was centered and rotated the pinion up a bit for the lift kit and welded the pads back on.

Then I had to torch off the shock mounts. This corp 14 had been on a different 70 truck, so they where the right ones, just too wide.

So I had to weld them on too. The Corp 14 has the "One in front, one in back mounts" that are not correct.

I can't tell you about a dana-60, but I imagine it is about the same drill.

Good luck

------------------
Scrub
70 GMC 1,000,000 + miles
72 K-20 project, 456 Dana60 front, Corp14 rear w/locker, 265R19.5 tires 20-ply. Warn 12k winches both ends, Cross-over steering with raised tie-rod, Powerbox steering, 4500 watt 120-AC power, Air, Hydraulic aux power, 4 inch lift, 5000 lb air-bags both ends.

Mike C · 05-15-2002, 09:04 PM

It is possible to cut the old perches off and weld new ones on. Available from Summit or Jegs for about $15. The frame is the same, it is the spring perches that are different. Randy's Ring & Pinion, www.ringpinion.com has 3.90 gears for the corporate when combined with tall tires (31-33" tall) is quite liveable. My Sub has 235 85 16's on it(!)and does quite well on the highway.

------------------
70 GMC 3/4 ton Sierra Grande 402/TH400
72 Jimmy 4WD 4spd 4" & 35's
64 Corvette Coupe
68 Camaro 'vert TPI & TH700
69 Z/28 355 12.6's @110
72 Datsun 240Z-ol' reliable

da-burb · 05-15-2002, 10:26 PM

Thanks everybody, I will relay the info to him.

05-15-2002, 04:24 PM	#1
da-burb "Ochre Ogre" Join Date: Apr 2000 Location: Springfield, MN Posts: 3,558	Dana 60, C-20 vs C-20 Longhorn I believe there are pins on the axle tube that register the axle to the leaf spring pack. Has anybody gone from the wider 2wd to the narrower 1 ton Longhorn and 4x4 frame dimension? What is involved? I have a friend that wants to put one of my Dana 60's with 3.54 gears under his Longhorn instead of the Eaton with the screaming engine gear ratio. His 454 would be much happier. ------------------ 1971 C-10 Suburban 1972 C-10 Suburban 1969 XL Galaxie Fastback 1968 Galaxie 500 Fastback 1974 SCOUT II Montrose, Minnesota __________________ Bowtie Truck Stop Inc. Mid-West GM Truck Restoration Parts Supplier Your Key Parts, Auto Metal Direct, Dynacorn, and Goodmark dealer. like us @ www.facebook.com/BowtieTruckStop 1971 C-10 Suburban (Ochre) 1971 K-10 Suburban (Ochre) 1972 C-10 Suburban (Ochre) 1972 K-20 Suburban (Yellow- that just aint right!) Springfield, Minnesota 56087

05-15-2002, 05:32 PM	#2
ckhd Registered User Join Date: Oct 2000 Location: St. Johns, Arizona Posts: 2,660	"Screaming engine gear ratio" - funny! I have one of those in my '68. I haven't done the conversion yet, but I plan on a Dana 70 conversion. It will require leaf spring pads welded on (I'm pretty sure you can get them at Summit). I don't know if the brake hoses have the same size fittings or not. ------------------ Bowen '68 K20 fleet '69 K10 swb fleet '72 C10 lwb step '72 K10 Suburban __________________ my 2¢ - t.i.o.l.i. Bowen 1968 K20 fleet 1969 K10 swb fleet 1972 K10 Suburban 1972 C10 lwb step 1992 K1500 'burb 1995 K2500 'burb 1997 C1500 'burb 1999 K1500 2000 K1500 'burb Why do I own so many Suburbans?

05-15-2002, 06:26 PM	#3
DennyB Led Sled! Discs R 4 ME! Join Date: Jan 2001 Location: Toms River, NJ, USA (Transplanted Hoosier) Posts: 7,327	da-burb, I cant help you, with your question but I learned something as of late that may help. There is a company that rebuilds the corporate nodular sections. Apparently there is a demand for that 10 bolt with a 10"+ ring gear:O They make a higher gear (3.something,,3.7? maybe). This may help with the screaming 4.57+- gears and would be a quicker install. I can find out more info if you like. If your intrested e-mail me. __________________ "Never ride faster than your Angel can fly" I.M.O.M,W,J&C Patriot Guard Rider

05-15-2002, 08:36 PM	#4
Scrub Collector of rusty Items Join Date: Dec 2001 Location: Sisters,Oregon USA Posts: 731	I just put a corp-14 under my 72 4x4. I took the axle into to a local welding shop and had them air-arc the spring pads off. as it turned out the shock mounts where different also so I should have had them done to. Cost 30 bucks. After that I just lined the same spring pads up so the axle was centered and rotated the pinion up a bit for the lift kit and welded the pads back on. Then I had to torch off the shock mounts. This corp 14 had been on a different 70 truck, so they where the right ones, just too wide. So I had to weld them on too. The Corp 14 has the "One in front, one in back mounts" that are not correct. I can't tell you about a dana-60, but I imagine it is about the same drill. Good luck ------------------ Scrub 70 GMC 1,000,000 + miles 72 K-20 project, 456 Dana60 front, Corp14 rear w/locker, 265R19.5 tires 20-ply. Warn 12k winches both ends, Cross-over steering with raised tie-rod, Powerbox steering, 4500 watt 120-AC power, Air, Hydraulic aux power, 4 inch lift, 5000 lb air-bags both ends. __________________ Scrub Sisters, Oregon - Home of the Sisters Rodeo. 70 GMC 1,000,000 + miles 72 K-20 project, 456 Dana60 front, Corp14 rear w/locker, 265R19.5 tires 20-ply. Warn 12k winches both ends, Cross-over steering with raised tie-rod, Powerbox steering, 4500 watt 120-AC power, Air, Hydraulic aux power, 4 inch lift, 5000 lb air-bags both ends.

05-15-2002, 09:04 PM	#5
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,723	It is possible to cut the old perches off and weld new ones on. Available from Summit or Jegs for about $15. The frame is the same, it is the spring perches that are different. Randy's Ring & Pinion, www.ringpinion.com has 3.90 gears for the corporate when combined with tall tires (31-33" tall) is quite liveable. My Sub has 235 85 16's on it(!)and does quite well on the highway. ------------------ 70 GMC 3/4 ton Sierra Grande 402/TH400 72 Jimmy 4WD 4spd 4" & 35's 64 Corvette Coupe 68 Camaro 'vert TPI & TH700 69 Z/28 355 12.6's @110 72 Datsun 240Z-ol' reliable __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

05-15-2002, 10:26 PM	#6
da-burb "Ochre Ogre" Join Date: Apr 2000 Location: Springfield, MN Posts: 3,558	Thanks everybody, I will relay the info to him. __________________ Bowtie Truck Stop Inc. Mid-West GM Truck Restoration Parts Supplier Your Key Parts, Auto Metal Direct, Dynacorn, and Goodmark dealer. like us @ www.facebook.com/BowtieTruckStop 1971 C-10 Suburban (Ochre) 1971 K-10 Suburban (Ochre) 1972 C-10 Suburban (Ochre) 1972 K-20 Suburban (Yellow- that just aint right!) Springfield, Minnesota 56087

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