Converting Auto Equipped Truck Cab to 4 Speed Manual

[Dave K.]

Cab 1: 1968 2wd Auto
Chassis to be installed on: 1968 4wd K20 Long bed

Just curious what needs to be done to modify 68 2WD cab originally equipped with an auto to accept a 4 speed floor shift. I have a nice 68 Cab I wanted to use for a project and the project has a 4 speed (a K20 long bed). Understand I have to change up the pedals (are they a direct bolt in)? Also I'm guessing the hump and cover for the 4 speed has to be added in but not sure how much work that is... as well as the transfer case shifter hole and such. Interested if anyone has insights here--better yet pics!

Thanks, Dave.

[Dave K.]

Nada on the input front here? Someone must have done this before.

['68OrangeSunshine]

There's a Z-Bar pivot bracket on the drivers side frame, you'll have to cannibalize off a manual frame, or build your own from a short piece of angle iron.
Don't forget to 'neutralize' the Neutral Safety switch in your wiring harness. Not necessary with a manual transmission, but an unmodified Automatic harness will be always open without bridging this gap.
You will need a high hump panel.
The clutch pedal should slip on the same axis as the brake pedal. Not sure how. There is a clutch pedal return spring inside the cab, not present in TH production cabs.
I haven't done this myself, but I have an OEM-automatic K/5 I want to ressurrect with an SM465/T221 tranny/transfer case.

[Dave K.]

Thanks for the input. I have the manual cab and such so transferring the parts from the to the auto cab shouldn't be a problem. I have the high hump as well . Point taken about the harness, good catch. I hope the peddle assembly and such is just a direct bolt-in.... can't imagine why it wouldn't be.

[Classic Heartbeat]

Pedal assembly is direct bolt in. WES

[Ugly 61]

Actually the clutch pedal shaft will slip into the hollow center of the brake pedal shaft and if I remember correctly the clutch pedal shaft is held in place by a e-clip. I did this conversion in reverse several years ago. You can take your auto shift lever out of the steering column or replace the column with one from a manual trans. truck

[Don Quixote]

FYSA, I happen to have a V8 Z-bar and the engine side mount bracket. I swapped a 292 back into mine recently and I have some V8 stuff kicking around. I think I have a crossmember as well.

[demian5]

Ive been thinking about it and if I did, I would use a hydraulic pedal and slave cylinder to operate the factory fork to eliminate the crappy pedal height and z-bar issues. The novac i like because you have to pull nothing.

http://www.superchevy.com/how-to/tra...raulic-clutch/

http://www.moderndriveline.com/catal...ic_masters.htm

http://transmission.moderndriveline....aulics-c25.htm

https://www.novak-adapt.com/catalog/...-hcr3/kit-hcrc