I'm wanting to install a 4 speed in my 66 slick. My truck currently has a 3 on the tree.
Does anyone have a template of measurement for cutting out the floor board to accommodate the new 4 speed?
2nd part of question, do I need to remove the entire transmission hump for the install?

Thanks

 

no on hump removal, unless it unbolts,
if so, remove hump, install shifter and take measurements and transfer to the trans hump
cut hole

if not removable (trans hump)
install shifter to trans minus the shifter lever
use a punch to indent location of shifter lever under floor
drill hole and use aviation snips to make hole for shifter lever
install shifter lever


or that's how I have done it on floors with non removable trans hump

 

You might want to tell us which engine you have and which 4 speed you intend to install. There were two truck 4 speeds available from the factory in 1966, Warner T-18 and New Process 435, both with granny 1st gear. Some people talk about wanting to install a Top Loader or T-10 car trans to avoid the granny gear. Don't know how many have done it but a few have. The trans tunnel floor is different between the factory 4 speeds and the automatics/3 on the tree, so it might be best to figure out which trans you plan to use, get one, and then mock it up so you can see what kind of hole you will have to cut. Remember that the truck 4 speeds are really just 3 speed manuals, with an occasionally used granny low, shifted from the floor instead of the column. Most of the time you will start out in 2nd gear. 4th gear is a direct 1:1 ratio, same as 3rd gear in the 3 speed. Good luck with whatever you decide.

 

The T19 will also keep you away from the super low first.

 

Please answer SS's questions. If you're thinking of a "car" trans I can't help, but I recently converted my '66 from a 3-spd column to a T-19 truck trans with a 4:1 synchronized low - cut the floor etc, etc. If you are going to a truck-style trans I can tell you what I did.
Eric

 

Like the redneck said at the same time I was posting: Consider the T-19, to avoid that granny low, unless you haul big loads on big hills. Be advised that the T-19 is available with first-gear ratios of 4:1, 5:1, or approximately 6.68:1.
The latter is pretty uncommon, the 4:1 is in the 80's diesel trucks.
Eric

 

my suggestions was assuming you were using a car/f100 style 4 speed


I was just checking on doing this on mine today for a toploader


if granny gear, listen to the other guys

 

Yeah, Anthony, I thought about a car-type trans as well. The "era-correct" (big in, big out) toploader is expensive, to the point that a 5 or 6-speed becomes an option.
Eric

 

the 3spd ODs are still cheap
as far as true 4 spds, unless you a restorer of hauling logs, yaw can keep them

 

I'm not certain on the type of 4 speed, great question. I will have to research for it.
The trans came from a 68 f100 2wd with a 390. I had to take the top of the trans off for mock up as the top of the trans hit the bottom of the trans tunnel.

How would I determine the type of tran I have?

Thanks for all the help

 

I have a feeling I hAve the granny gear, I do not ever plan on hauling anything.

 

You will need the factory "hump" and fasteners.
Place the hump on the cab floor. It will be pretty clear where it goes.
Mark the locations of all the holes and drill them. You might need the seat out for this step.
Look at a factory installation to determine where to cut the floor in relation to the holes. The cut must be a certain distance from the holes.
Slide the "J-nuts" into place at each hole.
Install the transmission.
Place a bead of "dum-dum" around the opening.
Put in place on the shifter tower the foam and thin steel plate (for shifter boot).
Secure trans cover.
I strongly suggest you look for a T-19 with a 4:1 low gear. They are not rare or expensive. I saw one in my local CL recently for $125.
Eric

 

Thanks 6t6merc.
What do you mean by the factory hump? Do you mean the top of the transmission that I took off?
Thanks again.

 

Warner T-18 = Reverse is up, towards the dash.

NP435 = Reverse is down, towards the seat.

Warner T-19 only available in 1973/79 F350's.

 

Thanks Numberdummy. Yep I have a T-18. Granny gear