Specifications

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TH400: This transmission is known as the heavy duty version of the TH350. We manufacture a full line of adapters to utilize this
transmission. The O.A.L. is 24-1/4” long. It has a 1st gear ratio of 2.48:1; 2nd 1.48:1, and a 3rd gear ratio of 1:1. We offer two kit
styles for the TH400 transmissions. Both kits use a 4.25” aluminum adapter housing. The first kit comes with a new TH400 output
shaft. It couples to the Dana 300 using a spud shaft that is supported by a roller bearing located in the adapter. The second kit is
designed for a 2WD transmission with an output shaft stick out of 4.5” from the hex bolt pattern. This kit requires the output shaft
to be slightly shorten. We use a new 32 spline Dana 300 input shaft in the transfer case to couple these units together.
TH400 to Dana 300 Optional Items:
50-6400 4.25” spud shaft adapter kit 716021 Trans mount (or)
50-6404 4.25” Dana 300 input shaft adapter kit 716017 Trans mount
4L80E: This transmission is similar to the TH400 except that it is electronically controlled and has an overdrive. This transmission
does not use a reluctor ring like the 4L60E. The 4L80E transmission is normally equipped with an internal reluctor ring on both
the transmission input shaft and output shaft. The computer takes both of these readings in for the proper shifting and operation
of this transmission. We have always ignored the reluctor ring requirement for this transmission since it is internally regulated. We
have now learned that the rear reluctor ring is not always installed into the transmission. The basic rule of thumb is 4WD
transmissions up to 1996 should have a rear reluctor ring in the main transmission case. All 2WD transmissions should have the
rear reluctor in the main transmission case. The 1997 & newer 4WD 4L80E transmissions have a sensor provision; however, the
reluctor ring in the transmission is left out. The tailhousing bolt pattern is the same as the TH400, but indexed with a different diameter.
There are several lengths of the stock 2WD transmission output shaft, but only one length of the 4WD. The 1st gear ratio is 2.482;
2nd 1.482; 3rd 1.1, and a 4th gear ratio of .75. This transmission was designed by GM to replace the GM TH400 transmission. Like
the TH400, the 4L80E has a 32 spline output shaft. Our kit is designed for a 2WD transmission with a output shaft stickout of 4.5”
from the hex bolt pattern. This kit requires the output shaft to be slightly shorten. We use a new 32 spline Dana 300 input shaft in
the transfer case to couple these unit together.
4L80E to Dana 300 Optional Items:
50-0401 4.25” Dana 300 input shaft adapter kit 716021 Trans mount (or) 716017 Trans mount
C4: This 3 speed transmission was used in Ford cars & trucks from 1964 to 1981. We recommend obtaining a 1970 & newer
transmission for conversions. The transmission case length is 11.180”, and with the bellhousing measures 17.00”. This
transmission was used up against small block Ford engines. The adapter we manufacture will require the installation of a new
23 spline output shaft to couple to the Dana 300. This is the most popular transmission when converting to a Ford engine. The
1st gear ratio is 2.46:1; 2nd 1.46:1, and a 1:1 3rd gear ratio. The adapter for the C4 transmission includes a 6.25” aluminum adapter
housing and a new C4 output shaft. This kit also includes a seal, gasket, and necessary hardware.
C4 to Dana 300 Optional Items:
50-8100 6.25” adapter kit 716021 Trans mount (or) 716017 Trans mount
AOD & AODE: This Ford automatic overdrive 4 speed is drastically different in appearance than any of the C-series transmissions.
This integral (one piece) transmission was introduced in 1980, and found in the F-series pickups behind small blocks. The transfer
case adapters we manufacture for this transmission require the installation of a new output shaft. The AOD was used up until 1993,
in cars & trucks. The 1980-87 (early) transmission main shaft was different than the 1988 & up (late) transmission main shaft. These
shafts use different oiling holes and, if interchanged, could cause improper shifting or transmission damage. This transmission
is becoming very popular for many conversions. We offer adapters for most early and late transmission applications. The
transmission O.A.L. is 20.50” long. It has a 1st gear ratio of 2.40:1; 2nd 1.47:1; 3rd 1:1, and the 4th gear is a 33% overdrive.
The AODE (4R70W) transmission is similar to the above AOD transmission and was used in rear wheel drive vehicles starting
in 1991. The adapter housing for the AOD transmission will fit the AODE; however, the output shaft of the AODE is different with
reference to the oiling holes. Since the AODE does not have a governor, the oil supply line must be plugged. Our kits for the AOD
can be used on the AODE transmission, provided that you obtain a few components from Ford. The necessary components are
stocked by us under P/N 716057. These kits come with a new 23 spline output shaft and a 6.37” aluminum adapter housing.
This adapter housing is a stock Ford 4WD adapter.
AOD & AODE to Dana 300
50-2901 6.37” 1988 & newer transmission adapter kit
50-2902 6.37” 1987 & earlier transmission adapter kit
50-9925 .75” Kit fits a 4WD AOD with 31 splines to the Dana 300 transfer case
C6: The C6 is a Ford Heavy Duty 3 speed automatic. The gear ratio is also identical to the C4 transmission. The C6 has a case
length of 20”, which includes the bellhousing. This transmission is used up to all three Ford block bolt patterns. The bellhousing
and case are integral (one piece); therefore, the C6 has 3 different casings. This transmission was used in vehicles 1968 to 1979.
The adapter for the C6 transmission includes a .75” aluminum adapter plate and a new Dana 300 input shaft. This plate bolts to
the stock Ford 4WD housing and allows for some rotation options on the Dana 300 transfer case. This kit will only fit a 4WD version
C6 transmission.
C6 to Dana 300
50-9925 .75” . adapter kit
transmission types & t/c adapters (1980-86)