Specifications
32
TH400: This transmission is known as the Heavy Duty version of the
TH350. We manufacture a full line of adapters to utilize this transmis-
sion. 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. Caution should be used when
converting this transmission into short wheel based vehicles
because of the overall length. The adapters for the TH400 all come
with a new output shaft that is manufactured with a 27 output
spline. All kits use a 2.875” aluminum adapter housing. These
kits use a spud shaft (either 6, 10, or 23 spline) that is pressed
on to a roller bearing and and then pressed into the adapter housing. These
adapters do not come with the sealed transfer case bearing or index retainer. The
front transfer case yoke can sometimes become a clearance issue, so we do offer
a smaller yoke kit to assist you if it does present a problem. We also offer a stock
replacement adapter for vehicles that had the AMC TH400 transmission stock. This
adapter is the same length as the stock adapter and retains the Jeep 15 tooth drive
gear and the stock TH400 output shaft. Our casting in this kit can not be used as just
an adapter housing replacement. The complete kit must be used which
includes a new coupler shaft and bearing.
TH400 to Dana 18/20 & Scout 300 Optional Items: 716001 Large hole index retainer
50-1300 2.875” 6 spl. adapter kit 716002 Small hole index retainer
50-1400 2.875” 10 spl. adapter kit 716302 Sealed bearing
50-1401 2.875” 23 spl. adapter kit 716009 Small yoke kit
50-0500 2.50” 15 spl. stock adapter replacement kit 716003 Trans mount (or)
716021 Trans mount
C4: This 3 speed transmission was used in Ford cars & trucks
from 1964 to 1981. We recommend obtaining a
1970 & newer transmis-
sion for conversions. The
transmission case length
is 11.180”, and
with the bellhous-
ing measures 17.00”. This transmission was
used up against small block Ford engines.
The adapters we manufacture will normally
require the installation of a new output shaft. 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 5” aluminum adapter hous-
ing and a new custom C4 output shaft with 6 splines. This
kit also includes a seal, gasket, and necessary hardware.
C4 to Dana 18/20 Optional Items: 716003 Trans mount
50-2900 5.00” 6 spl. adapter kit 716001 Large hole index retainer
716002 Small hole index retainer
716302 Sealed bearing
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 was 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 5” aluminum adapter housing and a new custom C6 output shaft with 6 splines.
This kit also includes a seal, gasket, and necessary hardware.
C6 to Dana 18/20 Optional Items: 716001 Large hole index retainer
50-3300 5.00” 6 spl. adapter kit 716002 Small hole index retainer
716302 Sealed bearing
716021 Trans mount (or)
716003 Trans mount
dana 18 & 20 t/c adapters (1941-79)