The Stovebolt Site Forums The Shop Area Paint and Body Shop Seat Extender for 1955 3100?

I'm 6'4" so I have removed the fuel tank and closed off the fill hole and will install a tank in the frame in the back as thousands have done before.
I would like to use the original bench seat though just set back 4" or so.

I found Tri-five car seat extenders that do just this but found nothing for the 55-58 3100s.

Does anyone know if such a thing exists?

You may want to sell your truck in the future. If a 5'6" person can't reach the pedals then it loses value.
You want your head to be several inches away from the rear of the cab with the bench seat springs compressed (heaven forbid, someone rear ends your truck).
Your stock seat tracks bolt to the floor. I would study making an adapter, that can be added and removed, without modification to the original tracks.
The 55 2nd floor doesn't have the rear barrier or panel that the 55 1st has.

I’m not at home right now but, if memory serves me correct, I can barely get my hand between seat and window to flip it forward. You might double check if there’s room to move it back 4”. I’m guessing you’d be sitting up uncomfortably straight, or possibly leaning forward. Here’s best pic I’ve got on my phone of my ‘57 with OEM front seat.

These trucks were not made for people over 6’ to drive comfortably. You cannot move the seat farther back without running into the issues listed above. You can have a seat shop modify the seat back to make it thinner to gain you an inch or two but that’s about it. I feel your pain as I’m over 6’ also.

Thanks all for the input. The bench when installed with the fuel tank behind it had about 2" of room, and I could lean it to get another 2"... but that was a bit ago, will look again.

Thinning the depth of the back was something I hadn't thought of before.

I guess I could go the route very few have attempted... slice the cab and add 6" of depth.

I put the seat back in the truck, with the seat position adjuster all the way back there is 1.5" between top of seat and cab. So at most 1.5" is how far I could move the seat frame back before it starts to rub on the cab. the problem of course is the mount for the front is elevated while the rear is at the floor so to move 1.5" back the seat bottom now tilts forward. Shimming the front is easy, lowering the rear is significant metal fab to restructure the cross-brace.

I liked the idea of having someone change the depth of the back, it's about 6" right now and the frame is at the rear so leaving the seat in stock position and having the back be 3" deep instead of 6" is the same as moving the seat back 3".

It looks as simple as a) shortening every spring, dozens of them and b) tightening the cover to take up the slack. Might actually be something I could pull off other than the fact all the springs are tied together so taking each one out will be a pain. Will noodle on it, or ask the guy who did my 65 GTO seats for an idea.

Trying to not buy new covers, the ones I have are in fantastic shape and I'm trying to get the thing running/driving as cheaply as possible and still safe.

The upholstery shop will remove the entire spring assembly from the seat frame and make a new insert out of upholstery foam. The seat will be springs but the back will be foam.