4 on the floor install
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New User
Joined: Jun 2008
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4 on the floor install
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
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
Senior User
Joined: Oct 2012
Posts: 274
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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
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
Laughing Gas
Joined: Dec 2010
Posts: 1,091
Likes: 14
From: Tucson, Arizona
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.
Cargo Master
Joined: Apr 2001
Posts: 2,697
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From: Vancouver
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
Eric
Cargo Master
Joined: Apr 2001
Posts: 2,697
Likes: 46
From: Vancouver
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
The latter is pretty uncommon, the 4:1 is in the 80's diesel trucks.
Eric
Senior User
Joined: Oct 2012
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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
I was just checking on doing this on mine today for a toploader
if granny gear, listen to the other guys
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Cargo Master
Joined: Apr 2001
Posts: 2,697
Likes: 46
From: Vancouver
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
Eric
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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
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
Cargo Master
Joined: Apr 2001
Posts: 2,697
Likes: 46
From: Vancouver
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
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
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
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?
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?
NP435 = Reverse is down, towards the seat.
Warner T-19 only available in 1973/79 F350's.