K25 ON A K10 FRAME

[mpilon]

hi! i bought a 1976 gmc sierra K25 with a 350 manual transmission with a low-1-2-3-R am curently trying to rebuilt the truck because my frame is not in good shape, i ve found a 1975 K10 frame thats have a TH350 with a 350, am trying to see if i can use this frame ( the K10) and put my mecanic on it. i know the wheel base is not the same because mine (K25) have a long box and the K10 have a short wheelbase but i can deal with that.
is there anyone who know if it will fit on it,,,

 

[nvrenuf]

Everything from the cab forward will bolt on but there are some things that will need to be addressed;

- obviously you'll need a short bed
- you'll probably need 16 gal tanks, I do not believe the longer 20 gal tanks will fit a swb
- rear driveshaft will need to be shortened
- the tcase crossmember will fit but have to be relocated since the trans/tcase combos are different lengths.
- rear wiring harness length (shorten or tie up the excess)
- rear frame brake tube length
- rear spring lengths are different

 

[mpilon]

thanks

 

[mpilon]

Everything from the cab forward will bolt on but there are some things that will need to be addressed;

- obviously you'll need a short bed
- you'll probably need 16 gal tanks, I do not believe the longer 20 gal tanks will fit a swb
- rear driveshaft will need to be shortened
- the tcase crossmember will fit but have to be relocated since the trans/tcase combos are different lengths.
- rear wiring harness length (shorten or tie up the excess)
- rear frame brake tube length
- rear spring lengths are different

i waswondering if the frame durability is the same, like is the K25 one more strong, i wanna do an off road truck with it do i need to add plate to make it stronger

 

[nvrenuf]

Technically, I've read that some 20 series frames are thicker but we're talking about MM's not a significant amount. Anything that will damage a 10 series frame will damage a 20 series frame.

You can always box, reinforce, etc but there's a domino effect that's hard to stop. I would highly recommend both a steering box brace and a weld on reinforcement plate kit, 99.9% of square body frames are cracked or will crack at the steering box so these will be money well spent.