Frame differences
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Freshman User
Joined: Sep 2002
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From: grafton usa
Frame differences
I was wondering if anyone knew if there were any frame differences between th F100 vs. 250 or 350? I know other parts interchange but in the ways of gvw, (besides springs and axles) what are the differences between the trucks?
Tuned
Joined: Aug 2003
Posts: 286
Likes: 32
differences
My understanding is that the F250 and 350 frames were made from thicker steel. Read it somewhere, but don't recall where.
On a slightly related note, it appears many crew cabs (250 or 350) also got an additional steel plate welded to the outside of the frame (from behind the front wheels to just in front of the rear suspension).
On a slightly related note, it appears many crew cabs (250 or 350) also got an additional steel plate welded to the outside of the frame (from behind the front wheels to just in front of the rear suspension).
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
Interesting, It is my understanding that the 150 & 250 are the same with the 350 being thicker. The truth lies somewhere in between. 
Anything in particular you are wanting to do.
John
Anything in particular you are wanting to do.
John
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Freshman User
Joined: Sep 2002
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From: grafton usa
I have a 1969 F100 with a 390 cid and a c6. I absolutely love the truck but it doesnt suit my purpose when it come to hauling stuff. I heat my house with wood and on several occasions I had to turn down firewood that was given to me because it would have taken too many trips to get it all. The most I've hauled in it was about a 1/3 of a cord of wood. (full bed up to the rail) The rear bumper about drug on the ground and sitting in the drivers seat i felt like i was star gazing! LOL! I have 6 leafs on the rear axle and air shocks(4 leafs and 2 helpers) and the rear axle is a #17 which the manual says is rated for 3300 pounds. Truck GVW is 5000. The rear spring shackles are different between the F100 and larger trucks so a simple spring swap may not be so simple. Basically I don't want to go through the trouble of installing new springs and shackles, a new rear axle only to find out my frame is made up of aluminum foil compared to other trucks! I appreciate anything you guys can come up with.
Post Fiend
Joined: Jun 2002
Posts: 13,873
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From: Atlanta GA
From visiting the junkyards there appears no thickness difference between the frames. Basically 3/16. I have seen that plate welded to the outside of the frame though. There is a F-350 dual wheel reg. cab at the local junkyard that I believe is a 1972. I am going to go out and measure the frame sectional height and see what differences there are.
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Tuned
Joined: Aug 2003
Posts: 286
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Found it...
I found this on another ford truck site...
"F250 frames were made of heavier steel than the F100s, by about .030". The F100 frame is .171" thick (app. 7-gauge steel) whereas the F250 frame is .200" thick (app. 5-gauge steel). "
Tim
"F250 frames were made of heavier steel than the F100s, by about .030". The F100 frame is .171" thick (app. 7-gauge steel) whereas the F250 frame is .200" thick (app. 5-gauge steel). "
Tim
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Brett Foote
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
Kris, I don't think you need to be as concerned about frame as the springs under it. I have had over 5000 pounds in the bed of a F100 several times.
Maybe tow a trailer in with you and put a little less in the bed and more in the trailer.
John
Maybe tow a trailer in with you and put a little less in the bed and more in the trailer.
John
Junior User
Joined: Apr 2004
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68-72 F250 springs will bolt right up to any 68-72 F100, because I did it with my 72 after wearing the original springs out with carrying 4 loads of hay averaging 4000 lbs. 67 springs are slightly different. It worked real well carrying firewood filled up to the top of a camper shell. The 9 inch works almost as well as a Dana 60.
Senior User
Joined: Nov 2004
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From: Yelm,Washington
I have never had my '70 f100 next to a f250 so as to get a good comparison but , just having looked at both spring hangers I always thought they were very diffrent. I too would benifit from heavier duty springs in the back...How about the front coil springs, they too are heavier duty I'm sure..Will they also fit a f100 ? Thanks,Mark.
Moderator
Joined: Dec 2003
Posts: 97,654
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From: Saskatoon, Saskatchewan
I like the trailer idea to increase the payload. Mainly because the truck can pull more then it can carry and maybe slightly easier on the truck with good trailer brakes. I have trailers and the load can be left on the trailer leaving the truck freed up for other jobs. Trailers can also be rented only when needed untill a good deal comes up on a used trailer. When done with the trailer most of the money can be recovered by selling it.
Postmaster
Joined: Feb 2003
Posts: 3,439
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From: Spokane WA
the 67-72 F250 frames are thicker than the F100 frames. the F100 frames mic out to .025-.040 thinner steel.
the 73-up F100 frames were made the same thickness as the f250 frames.
if the concensus is they are the same, the concensus is WRONG.
the 73-up F100 frames were made the same thickness as the f250 frames.
if the concensus is they are the same, the concensus is WRONG.
Last edited by oldhalftons; Aug 7, 2005 at 11:49 AM.