Dodge Cummins Diesel Forum - Reply to Topic
98.5-02 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect..NO ADVERTISING .

Thread: NV5600 to FSO6406A 6 speed Fuller Reply to Thread
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:

Register Now

In order to be able to post messages on the Dodge Cummins Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


  Additional Options
Miscellaneous Options

  Topic Review (Newest First)
11-16-2019 10:47 AM
Tmtbob Be sure to post some pics of that. Iíd like to see it

Sent from my iPhone using Tapatalk
11-15-2019 11:06 PM
Jwpyle Does anyone know if someone has an Eaton Fuller on a 12v that was swapped into a Ď69 Ford F-250 Highboy. Iím swapping a 5.9 into mine and would like to have the FSO 8406A with it.
09-12-2019 11:52 AM
Dylanss180 I am monitoring it, I have a temp probe in one of the PTO covers. I was towing my RV last week at 75mph in 6th and it was getting warm (220F) and it was around 75 outside. The Eaton Manual says to have it operate 120f above ambient.
09-12-2019 11:42 AM
chansey Dylanss180,

Are you monitoring the oil temp in the tranny and therefore the oil cooler or was it just to add a safety factor? Isn't it nice to get in your truck and not have to worry about what your transmission is going to do.

The Fuller's seem to like hauling and towing and with the Cummins, it's a good match.

I agree that the 2000 and 3000 series Allison trannys are a good option. Even cores are over a $1000 if you can find one. I was watching an auction and two 2500's went for $2750 ea.

09-12-2019 09:14 AM
Dylanss180 Ill report in also. I did my swap a year ago and still no regrets here also. I ended up adding a tranny cooler on mine because I would tow in 6th gear going 75mph for hours on end. Still enjoy the tranny here as well. I was toying with an idea of getting a Dodge 5500 and swap in an allison tranny. Not sure what size but was thinking a 3000 series. I wanted to do an auto for the wife to be able to drive easier.
09-12-2019 05:34 AM
magnum12r That's good to hear, I've been looking at this thread for awhile now, but I'm looking more into an older style 13 speed myself, more of a custom factor for my use but also for great towing performance and reliability. (And I used to drive a 13 speed in a Pete so it's second nature to me.) I have just yet to find the exact model I'm looking for or gathered all the conversion parts. I need to do more model number research checking gear ratios and such, I prefer the ol silver knob Fuller 13's with the 3 position side switch. [emoji41]

Sent from my SM-N950U using Tapatalk
09-12-2019 02:56 AM
chansey Hi all.

Just checking in to see how things are going.

Had 26 telephone poles on my 40 ft trailer this week. Grossing over 30K. That FSO6406A is fantastic. No issues whatsoever, quiet, and no gear rattle. Turned radio off just to enjoy the ride. My truck will be 20 yrs old soon and I'll be 75 after the first of the year.

I'm currently building a 1996 12V VE Cummins that I've already sold. It's destined for a 2004 Chev 4500 with a 1000 Allison.

Picked up another Frito Lay truck (free) with a great running 3.9. Plans are to install it in my 1942 Chev G506.

If you're sitting on the fence contemplating if you should bite the bullet and do a trans conversion, go ahead you won't have any regrets.

Only current fix needed on my truck is the turbo is leaking oil ... need to get it replaced.

08-15-2019 01:24 PM
santino For sale 2006 ram 3500 extended quad cab from texas with 96 12 valve and eaton fuller fs06406a installed in it.... Selling due to fu**** neck n back mint texas ram 3500 dually lone star edition 156,000 orig miles loaded 12 valve p-pump has 130,000 orig miles on it eaton fuller fs6406a has zero 0 miles on just rebuilt done right truck is red with grey power interior clean title i love this truck $14,000.00 o.b.o 313-269-8519 truck is in detroit michigan
08-10-2019 03:28 AM
MaxPF Nice sheet metal work on the tunnel
08-10-2019 01:14 AM
wjones bumping the thread with an 8406a in a first gen.

anyone happen to have a source for the barring plugs other than the mopar #?
05-13-2019 04:12 PM
Originally Posted by B700 View Post
Paul has set this up to work with the Fuller. Not sure what issues arise with the Spicer. It is 100lbs heavier, a nightmare if you have problems, even as small as the shift lever jumping out of the shift bar in the tower. The gear shift housing is about 6' above the tower..meaning you will need extra room under the dash. The Spicer is a lot longer that the Fuller... drive shaft length will be substantially shortened. I guess the gear shift lever and housing will clear the dash because it will likely rise between the seats.
Another thought is that I was able to find a Fuller factory yoke to fit my Factory F-250 drive shaft Yoke and a compatible U-joint when I did my drive shaft. All the Spicer stuff that I have seen are huge.
Yeah that sounds like a bunch of drama. I do love the idea of another gear and a trans to have my "forever truck" hold up to just about anything. I really wish there was a double overdrive that worked in a pickup. The new automatics get 6-10 gears with a .64:1 overdrive! When can we get a close ratio manual with the same? We know Ram won't give it to us, which is all the more reason I'd love to do it to my truck someday.
04-16-2019 11:27 AM
redpower Here are a few 6 speed trannies but they donít say what exactly they are.

To answer the last post, it worked with my setup.
This thread has more than 12 replies. Click here to review the whole thread.

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

For the best viewing experience please update your browser to Google Chrome