Specifications

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1976-79 JEEP CJ5 & CJ7:
When retaining the stock transmission with either a Ford or Chevy engine, the conversion is fairly simple. The transmission and
transfer case can remain assembled and in the stock location. The 3 speed transmission used in these vehicles was referred to
as a T150. Before you purchase the adapter plate, you should verify if your vehicle is equipped with the T150 3 speed transmission.
The 4 speed transmission used was referred to as the Jeep T18 transmission.
When using the T150 transmission with a Chevy engine, you will have the option of using the
Advance Adapters full bellhousing, P/N 712548. This bellhousing will accept the stock
transmission without modifications, and all the original clutch linkage can be
retained. If a GM bellhousing is going to be used, adapter plate P/N 712527
will be required. This adapter kit will require a Chevy bellhousing that has the
4.686" transmission index diameter. You have the option of using the larger
bellhousing with the 5.125" transmission index. You can add our index spacer
ring to the retainer P/N 716078. A Ford conversion does not require any
adapter. The T150 transmission has the same bolt pattern and index diameter
as a standard Ford transmission.
When using the T18 transmission, there are various input shaft lengths to consider. Most of these 1976-79 Jeeps used a 7-1/2”
input shaft. When converting to a Chevy engine, adapter plate P/N 712528 is necessary. This adapter plate comes with a 4.686”
index retainer. For a Ford engine, P/N 712529 will be required. This adapter plate comes with a 4.848” index retainer.
A. Optional Transmissions: The stock transmission can be easily replaced by using various types of Ford or Chevy
transmissions. The adapters available for your transfer case are listed in the front section of this brochure. The transmission
selection includes truck 4 speeds, car 4 speeds, and automatics. The transfer case used in these Jeeps was a Dana 20.
B. Stock Transmissions: The T150 transmission used a 1-1/16” 10 spline input shaft (same as Ford). The Jeep T18 used
a 1-1/8” 10 spline (same as Chevy). Refer to the Clutch Section Chart for proper components. DO NOT ATTEMPT TO REUSE THE
ORIGINAL CLUTCH DISC. If you are retaining your T150 transmission with a Ford engine, you will not need to use an adapter plate.
The stock T150 will bolt directly to the standard Ford bellhousing that has a transmission index diameter of 4.848". Caution should
be given to the tip of the T150 transmission extending too far inward and bottoming out into the Ford engine crank.
C. Clutch Linkage: The stock clutch linkage can be easily adapted to the Chevy engine by positioning a clutch pivot location
on the driver's side of the engine block. We offer P/N 716638, which is a plate that bolts to the engine block directly above the oil
filter and provides a multiple hole location necessary for remounting the stock clutch linkage. The new bracket is supplied with a
male ball stud and new nylon bushings for the original linkage. If you are using the 712548 bellhousing, the stock Jeep pivot bracket
can be retained with only minor modifications. The stock linkage can also be completely replaced by using the chain controller,
Part No. 716639. On Ford applications, we do not offer any brackets to assist in the connection of your stock clutch linkage. Some
fabrication is required.
D. Exhaust: There are two header systems that could be used on these conversions. For the Chevy V8 conversions, Part No.
717011 headers offer the exhaust system inside the frame rails, while P/N 717038 offers exhaust systems outside the frame
rails. On Ford V8 conversions, we offer P/N 717012 inside-the-frame rail headers, or P/N 717034 outside-the-frame rail headers.
Outside-the-frame rail headers will offer much more performance due to the length of the tubing used. It is recommended that exhaust
headers be test-fitted BEFORE final engine location is determined.
E. Radiator: If the original engine was an AMC V8, the original radiator can be retained. The inlet and outlet positions will need
to be modified to match the new engine. Vehicles that were equipped with the 6 cylinder should look at upgrading to a higher cooling
capacity radiator.
F. Driveshafts: On V8 engine conversions retaining the stock transmissions, the driveshafts should not require modifications.
When upgrading the vehicle with a new engine & transmission, driveline modifications should be expected.
G. Engine Location: The main limiting factor when positioning the engine is firewall clearance. On Chevy engines, it is crucial
to allow proper clearance for the distributor cap. To locate your engine (retaining the stock transmission), leave the transfer case
in the original location and assemble the transmission, bellhousing, and engine forward from this location. When changing
transmissions, locate the engine and work towards the transfer case. Areas to keep under consideration are firewall, radiator, and
hood clearances. On some applications, additional clearance can be obtained with firewall modifications; or on Chevy blocks, using
a smaller distributor cap. When installing a new transmission & engine, most applications will require the engine to be offset 1”
to the driver’s side for front driveshaft clearance.
conversion application summary (1941-79)