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#1 |
Registered User
![]() Join Date: Jan 2001
Location: Sabinal, Texas
Posts: 1,706
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Are C-30 & C-20 Rear Leafs Interchangeable?
Will the 11,000#, 7-leaf springs from a C-30 bolt up to the hangers and shackles of a '72 C-20?
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#2 |
Join Date: Dec 1999
Location: Eastern - Manitoba Canada, Winnipeg
Posts: 4,369
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Hollander Interchange manual mentions both being the same size 2 1/2 inch by 26x26. Those two sizes being the 3/4 C20 version to the 11000 axle 1 ton version.
Make sure its a 11000 lbs 1 ton version as the 7500 lbs 1 ton version are 19 3/4 by 19 3/4 which is shorter. The way it looks in the book is that 3/4 tons had either 5 or 6 leafs while 1 ton had 7. On my own 1 ton I have a 8 in the main pack and 7 in the auxillary..15 total.
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Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife. |
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#3 |
user # 2756
![]() Join Date: Jun 2001
Location: Chesapeake, Virginia
Posts: 4,612
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I have some 71 C20 leaf springs in my garage that are not that wide, closer to 2" wide. I'll measure them to make sure.
Where's post #2?
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1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm ![]() |
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#4 | |
Resident Curmudgeon
![]() Join Date: Dec 1999
Location: NH
Posts: 6,664
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Quote:
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Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter ![]() Maybe I need to sell some of this crap ![]() Yet another Bozo with a sawz-all |
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#5 |
Registered User
![]() Join Date: Jan 2001
Location: Sabinal, Texas
Posts: 1,706
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Mine are the 2" wide, 7-leaf versions. I do not have overloads but I do have the Ride-rite bags on the truck. I notice it is a little "wavy" at times with my camper on it. I do have brand new Rancho 9000's, sway bars and good heavy tires. I only need about 40 PSI in the bags to get the truck level with a full load. It is possible that I have a mismatched set of tires on it (BFG's in the front and Cooper's in the rear). I was just wondering if I would benefit by putting the C-30 springs on it. I would'nt have room for an overload pack and the bags because I would not be able to fit the bags atop the springs and into the bracket.
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#6 |
Senior Member
Join Date: May 2001
Location: West Central Minnesota
Posts: 568
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My 71 C30 springs are 2 1/2 inches wide by about 51 inches eye to eye. 6 leafs in the main pack and 1 auxilliary leaf. It's a Longhorn.
Bob
__________________
V-6....only GMC Trucks have it! 62 GMC W5000 NAPCO-V6 65 GMC 2500 NAPCO Panel-V6 66 GMC 1000-V6 66 GMC 1500-V6 67 GMC K1500-SBC (originally a KM-V6) 68 GMC C1500-V6 68 GMC C1500-V6 68 GMC Suburban C2500 70 Chevy K20-SBC 71 Chevy C30 Longhorn-SBC 72 GMC Suburban C1500-BBC 72 Chevy C10-SBC 72 GMC C5500-ToroFlow Diesel |
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#7 |
Join Date: Dec 1999
Location: Eastern - Manitoba Canada, Winnipeg
Posts: 4,369
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six pack bee...your rear diff a eaton or dana? Not sure it makes a difference but thought I'd ask.
__________________
Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife. |
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#8 |
user # 2756
![]() Join Date: Jun 2001
Location: Chesapeake, Virginia
Posts: 4,612
|
I'll add the leafs I have were with a dana 60.
__________________
1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm ![]() |
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#9 |
Registered User
![]() Join Date: Jan 2001
Location: Sabinal, Texas
Posts: 1,706
|
I have the Dana 60 rear.
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