This may sound like a stupid question, but does anyone know what the hinged wooden board behind the seat in my 46 is for. I was told that it might be some kind of lumbar suuport for the seat, but this seems unlikely to me.
I will be removing it during the rebuild, but I'm curious about it anyway.

 

Your on the money, it is for adjusting the seat back.

There should also be two sets of mounting holes for the bottom cushion to move it forward or back.

Dave

 

I can't believe that would have worked.
My 41 doesnt have one, but it does have the extra holes in the seat bottom for adjustment.

Thanks for the info, I'm tempted to install the factory seat again just to try it out before I swap it out for a newer bench.

 

lol, I saw that on my '42, figured someone had added it in to make some type of table, never figured that Henry put it in there.

 

seat adjuster?

Fix, your 41 should have had it in there, as was mentioned that is for the seat adjustment. There should be 2 holes in the front bottom of the seat at front, and a pin sticking up from the seat riser about 1 1/2 inches.
When you lift the seat to adjust it foward or back, the hinge on the lower rear that is attached allows the rear of the seat to lower or raise. Without allowing the 2 extended metal straps from comming out of the 2 slots at the upper end of the seat back.
My 37 has this option as well, as did the 39 I had.

 

My truck has been worked over a bit.

The seat does still have the pins on the riser that allows for seat adjustment, but the board and the slots for the top seat tabs are missing. The top of my seat has the tabs but they just slip behind the interior panel and don't actually attach to anything.

Since I have the board from the 46 I might see if I can install it in the 41 to try it out. The 46 will be getting a Ranger bench seat, so I wont need any of the original seat gear.

When I got the 46 the seat and riser were already missing, so I can't see how everything would have been installed. Between the two I should be able to figure it out though.

Thanks.
Just more stuff for me to do.
I got to get an easier hobby, maybe golf or something.

 

seat stuff was long ago removed.

The back of the seat as you mention just slides into the back, is all there there are no tabs. The 2 extended steel frame pieces go into the horizontal channel that rus along the rear of the cab and has 2 rectangular openings in it for these to go into.
When you pick up the bottom of the seat to adjust it foward or backward they move in accordance, with the aid of the hinge at the back, that is fastened to the bottom seat portion.
The hinge itself is basically a door hinge that has one end about 3-4 inches in length, and the other is about 2 1/2 inches rectangular. Its only purpose is to hold the rear of the seat from dropping down the back of the cab, and allowing the 2 steel seat frames to slide up and down.

 

My seat is hinged together, back to bottom and moves all as one peice (not the original hinge) I can see the rectangular holes, but my seat tabs land about three inches lower than those holes.

I believe that my seat is installed in the dropped down position that the original hinge was suposed to avoid.

The 46 seat I have is completely different by the way, so no swapping parts around.
I might look around for the original hinges and try to get it all installed correctly again. It doesn't work all that well now, so i'm not concerned about possibly making it worse.

When installed correctly dsoes the seat still come out as one piece?
My battery is under the seat. I would like ot end up with an installation that makes this battery easier to get to. If I could just pull the bottom of the seat out instead of the whole thing it would make things a lot nicer.

 

OTake a check on this, by the sounds of the way your explaining it that the tabs are 3 inches to short.
Maybe the hinge was installed wrong, by this meaning the back of the seat should sit on top of the seat itself. If it does already then maybe the tabs of the rear of the seat have been cut off for some reason.
Forgot to mention yes if installed properly the seat does come out as one.