AdaptersAdapting the
AMC 2.5L (150cid) Engine
to
GM Transmissions
Replace your light-duty AX5 as found behind the AMC 2.5L I4 engine with something completely substantial, like the SM420 or SM465 transmissions. We've assembled this engineered kit as a solution. This kit is one of our more advanced swaps, but the thoughtful installer will be able to do excellently reliable work.
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The Kit
Included is a modified GM style bellhousing that accepts the AMC 150 crank position sensor, pressure plate, modified clutch disc, hydraulic slave cylinder, release arm, release bearing, pilot bushing, rod and pivot. We'll contact you after ordering and then we'll machine your bellhousing to either the GM 4-11/16" bore (SM420) or 5-1/8" bore (SM465).
This kit requires the use of a new, gear reduction starter like the Mean Green #3212 (typ. cost $250).
You may use your existing CPS (Crank Position Sensor), or we'll be happy to supply you a new one at an additonal competitive charge.
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Suggested Transmissions
The ultra-low geared SM420 or SM465 transmissions will add fantastic off-road and crawling abilities to your Jeep powertrain. These are the most oft requested transmissions and will offer the best overall performance.
We recommend that you run a 33 inch or greater tire to compensate for the loss of your overdrive gear. See our gearing page for more about this.
Transfer Case Shifter
This transmission conversion will work best with our #SK2X transfer case shifter kit. Factory shifters could be modified, but this usually results in a bigger mess than even the factory created with their shifter system.
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Transmission Shifter
Use of the OEM style transmission shifter for the transmission is easily done. The installer may opt to bend the stick to fit the particular Jeep application. The transmission shifter sits further ahead in the Jeep than the AX5 and will need to be modified accordingly.
Driveshafts
Note that you will be able to shorten your drivetrain length and lengthen your YJ or TJ rear driveshaft for better angularity and less strain and vibration. The front drivehaft will be lengthened a corresponding amount.
Engines & Engine Mounting
Your engine will remain it is factory location.
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