1/2 ton and 3/4 ton chassis

[84CUCV]

I have a 90 1/2 ton 4x4 and i found a 85 3/4 ton. I would like to start with one of them as a winter project. Is there a big differnce in the frame? I have a good 350 and 60 and a 14b just sitting wating for the sub. Let me know what you guys think

Thanks mike

 

[Muddytazz]

To the best of my knowledge, the frames are exactly the same.

 

[imiceman44]

I have a 90 1/2 ton 4x4 and i found a 85 3/4 ton. I would like to start with one of them as a winter project. Is there a big differnce in the frame? I have a good 350 and 60 and a 14b just sitting wating for the sub. Let me know what you guys think

Thanks mike

My knowledge is that the frame on the 3/4 ton is thicker, I don't know if it's enough to matter but I believe if I had both and both were in decent shape I would use the 3/4ton.
If the 1/2 ton was in better shape then I would use it.

 

[84CUCV]

Thanks i thought they 3/4 tons had a better frame. mike

 

[84CUCV]

OK thanks imiceman44

 

[woody9]

i've got a spec book on the 91's and it indicates a thickness & strength difference between 'em. I think all the length/wideth/exterior measurements are the same (swappable)... but the 3/4 is more beefy!

 

[84CUCV]

Thanks woddy9. mike

 

[Muddytazz]

i've got a spec book on the 91's and it indicates a thickness & strength difference between 'em. I think all the length/wideth/exterior measurements are the same (swappable)... but the 3/4 is more beefy!

Yes everything is swappable between the 2 with no problems. I have a frame specs in my 75 factory manual and in my dads 81 factory manual. I noticed that over the years things changed cause my 75 1/2ton frame is the exact same thickness as my dads 81 3/4ton frame

 

[imiceman44]

Yes everything is swappable between the 2 with no problems. I have a frame specs in my 75 factory manual and in my dads 81 factory manual. I noticed that over the years things changed cause my 75 1/2ton frame is the exact same thickness as my dads 81 3/4ton frame

Yes as the years go by, they go thinner on the frames and get closer to the limits.
They used to make things beefy now they make them work.