After a bit of arm twisting from Blue... I'll post my musings on my 1997 F350 truck here on PSN as well. As near as I can tell this truck is pretty well stock... Looks like it may have had a fuel cell in the bed at some point with a line hooked into the front tank, but that is about it. I think I'm the third owner. At this point I have owned the truck for 9 someodd years. At the time I bought it there were 164000 miles on the clock and as of today I have 234800 miles on the truck. My previous truck was an 1987 F250 powered by a 6.9 diesel with 350000 miles on the clock (ZF5
transmission). With the addition of our second kid it was just too small for the family. I have always liked the OBS
Fords so I started looking... I passed up a years worth of automatic trucks to finally land one with a manual transmission. The addition of 2 more doors makes driving the truck feel like an elephant so the name Jumbo stuck. The ZF5
470 is better geared than the older ZF5
420, but the truck still lacked the gearing I thought it needed. A couple of months after I bought the truck, I found an ad for dead International t444e motor. The fellow selling the engine was kind enough to separate the SAE 2 flywheel housing adapter needed for any future conversion to a commercial transmission. Original plan was a TTC Eso 7 speed swap. some years ago I pulled a mill I purchased locally home to my place. Truck, trailer and machine was around 29k (yah, I only exceeded the book GVCR by a bit, but come on - on the commerical side the T444e was put in applications up to 60k pounds). As I was just on surface roads it wasn’t too bad other than having to really ride the clutch to get the truck moving and having to go into 4 wheel low (in 2 wheel drive) to back the trailer into the driveway. Well come April 2016 and my dad nails an antelope just outside of Laramie,Wyoming. So I hitch up the ol' gooseneck and head out to retrieve him. All told I was pulling around 15k (Gross around 23K) and trying to keep the truck rolling at a reasonable pace was a bugger… there is a reason that the 97 F350 was only rated for 12k towed weight (and IMO
it sits between the engine and rear axle). Needless to say it was tough finding a gear the engine was happy with that didn’t require me revving the engine into the stratosphere (how did Ford come up with the red-line for the 7.3??) to keep the boost up and the truck at a reasonable speed. So, after arriving home I started doing some digging and found that someone had done an Eaton-Fuller RTO 6610 swap in a Dodge Ram. Two weeks of trolling ads later I found a RTO 6610 on Craigslist and the adventure was underway. Two days and 1533 miles later, this was sitting in my garage... Yeah - that is a 1.75 inch input shaft and a 2.25 inch output shaft with twin counter shafts that double the torque capability of the transmission. The open section of the transmission is a 5 speed gear box while the back section contains the high/low gear selector.