3/4- 1 ton frames

[ladderback66]

Hi Guys,
I just found a deal on a 1975 single cab 1 ton duelly 4x4. The body is gone but runs good. 350, manual locking hubs and a 4 speed. I already have a 1976 3/4 ton 2 wheel drive single cab with ok sheet metal. Are the frames the same on both trucks? Would I be able to take the rear end and box from my truck and put it on the duelly to make one good 4x4? Any help would be great!

[GM72K10]

Originally Posted by ladderback66

Hi Guys,
I just found a deal on a 1975 single cab 1 ton duelly 4x4. The body is gone but runs good. 350, manual locking hubs and a 4 speed. I already have a 1976 3/4 ton 2 wheel drive single cab with ok sheet metal. Are the frames the same on both trucks? Would I be able to take the rear end and box from my truck and put it on the duelly to make one good 4x4? Any help would be great!

They didn't make factory one ton 4x4s until 1977, Must be a conversion. Better do some checking.

[andrewmp6]

gm72k10 is there a way to check by the vin ?

[GM72K10]

Can you check the vin on the frame? Its on the frame rail above the bed on the 81 and up, see pic. Not sure about 80 and back. The vin on the cab should be on the door post. And the vin on the frame on the 81-87 trucks wouldn't give you the model number, just the last digits of the serial number. A 1 ton 4x4 77-80 should be CK#3@& Where the first digit is C for Chevy T for GMC, 2nd digit K for four wheel drive, 3rd digit is a Letter Code for engine type, 4th digit would be a 3 for 30 series (1 ton), 5th digit a 3 if a chassis Cab or a 4 for a pickup, 6 th digit is for year. Hope some of this helps.

So a CKL348Jxxxxxx would be a 78 K30 pickup with a 350. The vin decode info is available on the internet. Good Luck.