[William Winters]

I'm looking for the dimensions to place the brake/clutch pedals from a 1939 ford truck to a 35/6 ford truck frame, so I can have juice brakes.

[Deuce]

WELCOME to Hotrodders.com

Because the 35 - 36 frame is so close to the 39 frame ... this should be a doable thing. I suggest looking at a Ford parts manual ... they have diagrams ...

[pasadenahotrod]

If you in fact have a 39 clutch/brake pedal assembly it is virtually a bolt-in to your 35-36 Ford frame in place of your mechanical brake pedal setup. There is some slight modification to do to the frame rail but nothing radical.
To be sure you have what you think does the clutch pedal shaft go through the brake pedal shaft and end up with clutch arm to the right inside next to the engine?

IF not you have a 40-up pedal setup which will bolt in as well BUT you have to change the throwout shaft in your bellhousing to the later stle and use the crosshaft to frame with the ball stud like 40-48 so you can disengage the clutch factory-style. The pedals on the later style will probably need some modification as well, especially if they are 41-48 Passenger rather than 40 Passenger or 40-41 Pickup.
The part numbers cast into the pedals will tell you what year pedal assembly you have.
Brake pedal number 91A-2455 is 39 only, 01A-2455 is all 40 Passenger and 40-41 Pickup, 09A-2455 is 41-48 Passenger, 01T-2455 is 42-47 Pickup.
Clutch pedal number 91A-7520 is 39 only, 01A-7520 is all 40-41 Passenger and 40-41 Pickup, 09A-7520-A is 42-48 Passenger and 01T-7520 is 42-47 Pickup.

Note the 42-47 Pickup pedal bracket is flat on the abck and mounts flat against a straight crossmember across the frame rather than on the slanted leg of the 35-40 stylke Passenger/Pickup frames.

[streetrodderbn]

Amen Pasadena! another alternative is to buy a chassis engineering pedal assembly (if you don't need the clutch pedal) they bolt right into your frame with very minor trimming of the area in your frame,and they supply a template! if you choose to use the 39 pedal assembly,don't forget to install a new bushing kit (if needed)it makes the whole assembly like new!