Hey guys. I’ve got a 1979 f250 supercab that I’m planning on doing a Cummins swap in. I want to swap the frame on it to a new frame. Does anyone know of a frame that would bolt right up to the cab and still be strong enough to Withstand the Torque of the Cummins?

 

If you search this site you will find plenty of cummins swaps on the f250 frames. They usually box the front in after cutting the front cross member out and redesigning it. There is definitely plenty to read here.

 

i would just use the original frame but the old owner do a “hack” job on the frame when they swapped the 400 with a 300-6.

 

You would be building all new engine mounts and front cross member anyway. Unless the PO hacked up more than that.

 

Looks to me he just cut the front part of a donor truck that had the 300-6 already in it and just cut and welded it in instead of just getting new mounts

 

Looks factory to me. Can’t see the motor mounts.

 

You're not going to find a frame that "Just Bolts Up" If you want a Cummins then the simplest thing would be to use the frame that it came in or to swap the motor into your frame. Finding some frame that bolts to you rcab is going to be impossible and then modifying it to fit the motor on top of that is just way more work than anything else.

 

Those look like the crappy factory welds on the frame to me.

There's no other frame out there that I know of the body will bolt up to exactly. The 80-97 f250/350 trucks would probably be the closest and you'll probably still need to move some body mounts. And with a different frame you may still need to do frame modifications to get the engine to fit with the different body. I know quiet a few people have swapped these bodies on the 94-02 Dodge Ram 2500/3500 frames, using the whole Dodge drivetrain. You just need to fabricate all the body mounts. IMO, the Dodge frame and the Dodge front axle isn't as strong as the Ford stuff, but if it has a Cummins it should have a D70 or D80 rear axle which are nearly bulletproof. .Personally, I think you're better off just modifying your original frame if it's in good shape for the engine and swapping in a bigger rear axle. The only reason to go through the work to swap the frame would be if you want to move up to a more modern suspension and stronger axles, like a 05+ Super Duty frame, which is what I'd like to do.