I believe the F-100 is a little bigger and the mast comes in on the bottom rather than the top...but I've been wrong before.
Easy way to tell from the pitman arm side is the F1 has a large nut holding the pitman arm onto the fully splined sector, and the F100 has a pinch bolt on the pitman holding it to the sector, which only has a few splines at the top of the pitman.
Here are two photos of an F-1 box and one of an F100 box I borrowed one of Junkmanjr's photos out of the classifieds so give him photo creds for the F-1 box photos in the top too and used a somewhat generic F100 box photo in the bottom photo . Note I have been informed that the lower photo was altogether wrong
Sorry MR48chev but the last image will confuse folk as to me it looks very much like a 32/36 ford car steering box. The top two appear to be F1 with the off set mast and splined sector shaft.
Just a little more info on the F-100 boxes. 53-56 have a pitman arm with the ball stud on the end, and 57-60 have a pitman arm with a tapered hole for a tie rod end. The steering boxes are the same, and the pitman arms also interchange. Both pitman arms have the large pinch bolt at the top and only a few splines.
Well, just to add a side by side, here is a 48-52 F1, 53-56 F100 and arm, and 57-60 F100 and arm, left to right. Didn't have a F1 pitman arm handy
This is great info guys. I have a question that I seem to find conflicting info on, which one is the best for upgrading the Model A steering box with? Sent from my iPhone using The H.A.M.B. mobile app
Depending on what engine you are using, the F1 may give move clearance. The shaft exiting from the bottom of the box will help in some situations. The F1 uses the same internals as the '37-'48 passenger steering box.
Another consideration on the F-1 is the shaft on the bottom changes the angle of the steering shaft and wheel. Not a big deal; but something to take into account. The huge flange on the F-100 can be trimmed and new holes added, or cut off and a new one welded on, this helps with mounting angle and depth too.
The guys on the ford barn use a converted f100 box for the model a's. I used a not so modified f100 in my '28 build, with the f100 you can use the stock A column drop and the f1 you need to make an extension.
Great info! Pics help a lot (saved to my phone for future reference)! I passed on one at a swap last year, simply because I didn't know how to tell which one it was. (guy selling wasn't sure) And didn't want to get spend money on an unusable/undesirable one. Now I know! "And knowing is half the battle!"
Thanks for the replays guys. I have an F100 box but was told it wouldn't work and need an earlier F1. I looked into the ones the guys on the Ford Barn are using and contacted the guy that makes them. Too rich for my blood. I am only running the Banger, not a V8 so clearance isn't too big a deal. I just wanted to be sure it will work before rebuilding it and spending the time modifying it. Sent from my iPhone using The H.A.M.B. mobile app
I looked around and found out what needed to be done. I'm not running the stock headlight switch, so no mods at the bottom. The only real mods I'm doing are trimming foot to fit into the A frame, shortening it, changing the shaft end to run the A wheel and running the A column collar.
I think after this discussion people will be looking closer at the F100 box. I know I will. Thanks all that contributed.
hello, I happen to have a 1964 ford f100 steering gear box..... these I think will take Saginaw 525 internals, i.e. the longer corvette sector shaft or even fully splined sectors short input shafts at different ratios the input worm is right handed -heres another box, a 65 dodge d100 - happens to have a short input shaft, and a left handed input worm 1971 mustang - bit like a Saginaw 525 - insides are similar ish I think what I mean is, you could fit a fully splined sector shaft from a 525 into them and then clock your pitmann armwhere needed, ensuring the sector central tooth is engaged in the middle of the ball nut for straight ahead grab, something like that. also 71-80 Camaro pitmann arms 6 and 7 '' take an early for tie rod taper and fit - 1 1/6'' oh and there are 3 input ratios corvette seems the quickest 16 - 1 , I have fitted one into a c10 Saginaw 525, and can get 2.5 inches of travel for 1 turn - 2 turns of wheel lock to lock I think mustang is 18 or 20, all the pick up ones are real slow at 22-1
If you use the internal parts from an F1 in a F100 box or vise versa, will it turn in the opposite direction?