What's so special about a Scout Dana 300? Well many things
make it desirable including:
- The "Texas" bolt pattern
- The 2.62 low range
- Rear center output
- Sturdy construction
- Short transmission adapter
The "Texas" bolt pattern is the pattern on the input side which
is the same pattern used on the Dana 20 and Dana 18. The only
difference is on the Scout Dana 300, the bottom bolt is not used,
only the four bolts on the side are used. Since it features this
pattern, it is bolt compatible with any Jeep or Scout transmission
that has a Dana 20 or Dana 18 attached to it.
The Scout Dana 300 features a 2.62:1 low range just like the Jeep
Dana 300. This is a big improvement over the the 2.03:1 low range
of the Dana 20. If it doesn't sound like much difference to you,
remember that gears are multiplicative. If have a
Jeep T-18/Dana 20/3.54s combination for example, your crawl ratio is
6.32 * 2.03 * 3.54 or 45:1. If a Scout 300 was swapped in, the
crawl ratio would be 6.32 * 2.62 * 3.54 or 59:1. The same would
be true if you were running a wide ratio Scout T-19. Keep in
mind that all Scout T-18s, some Scout T-19s, and some Jeep T-18s
were close ratio.
The Scout Dana 300 also has a center output which is transfers
power straight through in two wheel drive high mode. The down
side of this over an offset rear output like the Dana 18, is
that the rear drive shaft angle is somewhat steeper. The good
side is since the center output is straight through in 2H, it
is quieter and longer lasting.
Another feature of the Scout Dana 300 is it features the same
sturdy construction as the Jeep Dana 300. The Scout 300 has a
cast iron case and is gear driven. The only real difference
between the Jeep and Scout Dana 300s is the input bolt pattern.
The Scout Dana 300 also has a short rear tail housing like the
early Jeep Dana 300s.
You will not find a heavy duty drive train as short and low geared
as a the Jeep T-18 and Scout Dana 300 combination. The Jeep T-18
used in late 70s CJs features a 6.32:1 first, short input shaft,
and a transmission to transfer case adapter that is about 1" long.
The Scout Dana 300 bolts right up to the factory adapter as you
can seen in this picture provided by Rick Boiros. Length of the
drive train is of particular concern for any short wheel base 4x4.
The real down side of the Scout Dana 300 is it is hard to find.
It was only available in 1980 Scouts, the last year the Scout
was produced, and a strike cut production short that year. Only
around 30,000 Scouts were produced in 1980.
Another limiting factor is that only the drive gear from Scouts
equipped with the T-19 four speed or T-15A three speed will bolt to
another Jeep or Scout transmission.
The Scout Dana 300 gear is different from the gear used with the Jeep
and Scout Dana 20. The picture on the right is a Scout Dana 300 and
Jeep Dana 20 input gear side by side.
The Scout Dana 300 drive gear is no longer available and
it will only fit on a transmission with a 1 3/8" 6 spline output shaft.
The part number for the Scout Dana 300 gear is 300-8-11.
1980 Scouts with the TF727 automatic have a drive gear that
is has a smaller interior diameter and is 23 spline. The drive
gear can theoretically be machined to 1 3/8" 6 spline, but good luck
finding a machine shop willing to do this work and it would add a
lot to the cost.
Since the Scout Dana 300 was only produced for a short time, some
of the parts for it are no longer available. The drive gear mentioned
previously is one of those parts. Some parts are common parts used
in the Jeep Dana 300 and other transfer cases. Other parts are unique
such as the speedometer gear are hard to find. The tail housing and
case are unique parts.
Another down side to the Scout Dana 300 is that if a seller knows
what they have, the price will be high.
IH Dana 300:
Details about how to find the coveted IH Scout II Dana 300.
Thanks to Jeepin' Joe Heinrich and Rick Boiros for pictures and
identification information. Additional identification information
I picked up from Howard Pletcher from Navistar International Tech