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02-12-2005, 10:18 AM | #1 |
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help with year of K20 chassis
I have a 3/4 ton 4x4 chassis under a 71 GMC 4x2 body. I am not sure of the year of the chassis, it has disc brakes, hub size for rims are 4 3/4" (see pictures), and the front leafs are 3" wide.
Last edited by Tully; 02-12-2005 at 12:45 PM. |
02-12-2005, 12:55 PM | #2 |
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Sounds like a newer frame like mine but those that really know will help ya out.
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02-12-2005, 01:33 PM | #3 |
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Ok Tulley after giving you crap over on the other board for douple posting hehe, few questions about your frame. Does it have a sway bar? Are there extra holes where the cab mounts? I have a 77 chassis and it has 3 inch wide springs.
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02-12-2005, 02:25 PM | #4 |
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3inch wide leafs I believe are 73 up.
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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. |
02-12-2005, 04:50 PM | #5 |
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Mudder, there are no extra holes in the frame but I have come to the conclusion that the PO put 73 up front springs under it. The brackets and shackles are bolted on. The rear shock and spring mounts are riveted on so they didn't try shortening a 73 up chassis. I started sanding through the caked rust to try and find the frame number I will let you know what I find.
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02-12-2005, 05:50 PM | #6 |
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Get the BOM number off the front Dana 44. It will tell you the original year and application.
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02-12-2005, 08:15 PM | #7 |
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Are the leaves 3" over the whole length of the spring? Stock for my 70 and 71 were 3" wide at each end and 2.5" in the center. 2nd, on the 3/4 tons I believe the internal style hub showed up in 76 or 77, before that they were all external style. Measure the length of the front springs, 73 and up springs are 3" longer than the 72 and earlier springs.
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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 |
02-12-2005, 09:14 PM | #8 |
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Tim, the numbers I found on the dana 44 are C-31256 287 44 5F
Jim, you are right the springs are 3'' at both ends and 21/2" in the middle. I never noticed that before. With weight on it they measure 43 3/4", hole center to hole center. |
02-13-2005, 05:05 PM | #9 | |
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Quote:
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02-13-2005, 07:52 PM | #10 |
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Tully, those are pre 73 springs. Same length as both my trucks. 73 and up are 46" long. I say your axle is a late 70s and your frame is pre 73 maybe even a converted 2wd truck.
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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 |
02-13-2005, 08:55 PM | #11 |
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Tim, I sanded down and found 10 20 1A4 603351 3
Jim, I think you just nailed it. Its a 2wd body and they put the front differential under it, that's why it's bolted. To do this they had to lift the truck because of the low hump. ( I put a high hump in and dropped it back down). The only other thing that puzzles me is the large rims needed. The only rims I have found are Ford, chrysler and some white spokes that will fit. In fact the chrysler ones only work up front. |
02-13-2005, 09:41 PM | #12 |
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603351
DANA 44 FRONT Year 1972 Make CHEVY Model K5 Blazer, K10 1/2 Ton Pickup & Suburban & Panel Truck Number of axle splines: 30 FULL hope it helps!
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1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650 |
02-15-2005, 12:34 PM | #13 |
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The VIN number should be stamped in the frame somewhere.
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02-15-2005, 09:09 PM | #14 |
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I looked for the Vin # on top of the frame rail by the power steering pump and nothing there. Where else should I look?
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02-16-2005, 08:54 PM | #15 |
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Its under the cab also....but can't really be seen without removing the cab.
If" 1969 GMC "found info on dating your front axle..it could be that some one just swapped out the locking hub style to newer version locking hubs, and the hub its self. It can be done and might of had to have been done that way as parts for the 70-72 style 3/4 ton locking hubs are hard to find.
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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. |
02-16-2005, 10:02 PM | #16 |
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If its a converted 2wd chassis, a hole would have to be drilled in the frame for the rear shackle to mount (on the front diff.)
Here......... |
02-18-2005, 09:56 AM | #17 |
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Denny, yes it looks like the rear shackles were added, they cobbled some steel plates on the outside of the frame that covers up the hole they cut.
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