3 speed to automatic swap

[Monkeyman73]

I have a 73 C10 with a 3speed on the column and I would like to know if I have to cut floorboard to make room for the automatic , are there any tricks ?
Thanks..

[beastie_3]

I think the high hump floors were only for 4wd and/or manual transmission (floor shift), so you will be ok.

[Swims350]

no,


 autos had low hump and stick shifts if not all then floor shifts had high humps like 4x4's as mentioned already.

[beastie_3]

"no autos" OR "no, autos" ??

[Swims350]

eehh my bad

[beastie_3]

I wasnt sure if you were replying to the OP or correcting me. Just had to ask.

[Swims350]

not a prob. man didn't realize how that one turned out LOL. The No was for him on cutting floors.

[bake74]

  Monkeyman, I assume you had an automatic standard in your 73 because of the 3-on-the-tree.  Are you changing to a different automatic transmission, or is your question, you want to move your shifter from the steering column to the floor and what modifications if any you will have to perform?

[bake74]

  Wow, just remebered some of these trucks came manual with shifter on column, sorry my bad.

[Swims350]

yea that was exactly what I assumed he meant by 3 on the tree a speed standard shift and he wants an auto.

another fyi had a 76 had 3 on the tree floor conversion is easy to do and cheap,

a saginaw 4 speed or maybe another like muncie is the same length, same driveshaft and same mount to put in place of the 3 speed stick from stock, and a th350 short tail 6 inch tailshaft is the exact same bolts up in place and uses the same mount and crossmember and location. Shiftiing it is gonna require an auto column swap or a floor shifter for an auto. If you do a column you you'll need all the linkage of course to make it work. You are also gonna need an auto radiator or a large aux. trans cooler for an auto and cooler lines. If you go with a th350 or 400 which has a vacuum modulator you're gonna need to run a manifold vac. source to it, be it a tee into something like the brake booster line or right in the intake. There is a kicdown cable on the th350 and may require a bracket to mount it to the engine depending on what it has on it, stock or universal brackets can be found cheap. A 700r4 of course has the tv cable same deal, needs bracket to mount, th400 has eletronic kickdown switch mounted by the gas pedal need that or a aftermarket kit to hook it up and make it work, or pull the shifter down a gear to pass lol. 700r4 and th400 are gonna need some sort of driveshaft, crossmember and mount reconfigure/movement/fabrication or modification. A 700 is also gonna need a lockup kit for the torque convertor same as a th350c would need.

I hope that helps anyone else who might want to do this or maybe the OP, but I think he already knows or has what he needs since he only asked about the floor.

[Monkeyman73]

Thank you guys for all the usefull info,, Its what i really needed to make  plans for the swap