Converting to a
To use a C-4 or C-5 out of a car or truck other than the
Bronco you have to use the Bronco tail shaft which means
taking apart the tranny to swap them. It is far easier
to use a complete C-4, flex plate, convertor, t-case input
shaft, all misc. bolts, intermediate housing, and auto starter
straight from an EB! Since this is often a source of
confusion, it is repeated below:
The Early Bronco had some transmission parts that were
specific to this vehicle. You must use the correct part for
a proper conversion.
C-4 or C-5 transmission and bell housing
Bronco flex plate and bolts
Automatic transnsmission starter (available at any parts house)
Early Bronco Intermediate Housing;
the housing that goes between the trans and the transfer case.
This is one of the hard to get and expensive parts. It only
came on a bronco. Now the only new ones come from Advance
Adapters, and they're very proud of their stuff.
the shaft that goes between the trans and transfer case.
Another expensive bronco only part. Currently produced only
by Advance Adapters. You may also have the existing shaft
- Shifter; see above.
Transmission cooler or a radiator with the transmission cooler inside.
Transmission cooler lines
The steps for the conversion are:
- Follow manual directions for removing t-case and
tranny. Make sure and insert the special tool for the
manual tranny when seperating the 3-speed from the
intermediate housing. Remove the fly wheel and dust
cover. Note that you can make this tool by bending a piece
of all thread and putting a couple of washers and nuts on it.
(Thanks to Leland Wilson for this tip and much of the technical
consulting that went into this article).
- Remove the bolts holding the t-case and intermediate
housing together with the t-case sitting vertical, input
shaft pointing straight up to keep the t-case bearings
from dropping into the t-case.
- Remove the intermediate housing.
- Remove the input shaft to the t-case if it didn't come
out with the intermediate housing. Note: the manual
intermediate housing has a bearing retainer lip built into
it, unlike the intermediate housing for the auto.
- Remove the C-clip holding the input gears to the input
shaft. (It's not as easy as it looks!)
- Install the input gears onto the t-case input shaft
from an auto.
- Install the input shaft into the bearing retainer.
- Install seal into bearing retainer. Put o-ring on
bearing retainer and install intermediate housing to
NOTE: You'll need to have the t-case linkage bolt
hole drilled larger if you have a T-shift t-case and want to
You can either install the auto and t-case together or seperately.
The rest is just a matter of hooking up the cooler lines, cooler,
General Early Bronco Transmission Information
Off Road Torque Converters