Specifications

1987 & Newer JEEP TRANNY RETROFITS
(JEEPS RETAINING STOCK AMC ENGINE & STOCK TRANSFER CASE)
On many of the late model Jeeps, the stock engines that were used were adequate for horsepower and torque. An example of these
engines include the 4.0L, 4.2L, 258 6 cyl., 304, 360, and 401. The weak link is normally the stock transmission up against these
power plants. We also have many customers who wish to retain their 4 cylinder, but change their transmission for better gearing.
We manufacture bellhousing adapters to retain these stock AMC-Jeep engines with a new, stronger and, in most cases, a lower
geared transmission. The part numbers listed below are just the bellhousing & transfer case components required. A crossmember
support & clutch components may also be necessary.
FORD T18 & NP435: These transmissions are popular to retrofit into these vehicles. They are a heavy-duty 4 speed with a
granny low 1st gear. When converting to the AMC blocks (except the 4.0L), a stock AMC bellhousing can be used . These bellhousings
are normally found coupled to T150 & T176 trannys in Jeeps 1976-1983. Along with the Jeep bellhousing you would also need a
custom pilot bushing P/N 716156. This bushing allows for the proper Ford input shaft support.
When coupling up to a 4.0L engine we manufacture a new full bellhousing that retains the stock flywheel sensor which is essential
for the operation of this Jeep engine.
P/N 712569 - AMC 4.0L to Ford truck transmission
P/N 384180 - AMC Clutch disc (required when the stock tranny has 1-1/16” 10 spline)
Ford T18 T/C Adapters Ford NP435 T/C Adapters
50-3801 NP flush 23 spline 50-3900 New Process flush & long 21 spline
50-7500 New Process flush 23 spline 50-3901 New Process long 23 spline
50-7501 New Process flush 21 spline
50-7504 New Process long 21 spline
50-7205 New Process long 23 spline
(A crossmember support will be necessary on these conversions)
SM420 & SM465: GM truck 4 speeds with a granny low 1st gear. Ideal for rock-crawling. The two bellhousings below bolt to
the stock Jeep engines and allow the GM truck 4 speeds to be coupled into the Jeep drivetrain. These bellhousings have the flywheel
sensor option necessary for the 4.0L blocks. They also work fine for any other earlier Jeep engine.
P/N 712570 - AMC engines to SM420 (4.686” bellhousing index)
P/N 712571 - AMC engines to SM465 (5.125” bellhousing index)
SM420 T/C Adapters 4WD SM465 T/C Adapters
50-9701 New Process flush 21 spline
50-9702 New Process flush 23 spline 50-9808 New Process flush & long 23 spline
50-9703 New Process long 21 spline 50-9809 New Process long 21 spline
50-9704 New Process long 23 spline (For 2WD SM465 adapters, see the Transfer Case Selection Chart)
(Crossmember support & clutch components will be necessary on these conversions)
NV4500: GM & Dodge truck 5 speeds with a 5.61 first gear ratio and 27% overdrive. This
transmission is one of the most popular options when it comes to a transmission retrofit. Over
the years, we have developed several ways to convert this tranny into the Jeep vehicles.
The most popular and the shortest way to convert the NV4500 into the Jeeps is using one
of our full bellhousings. Part No. 712571 bellhousing is designed mainly for the 1995 & earlier
GM NV4500 transmission. Part No. 712568 can be used on both the 1996 & later GM
transmissions, but it also works great on the Dodge NV4500s. The Dodge trannies require
the installation of a shorter GM style input shaft. Both of these bellhousings have the provision
for the 4.0L flywheel sensor and will also work fine on all other Jeep engines. The stock Jeep flywheel thickness must be 1-1/8”
or thinner to obtain proper clutch clearance. Thicker flywheels are sometimes found on some early Jeep V8s. The GM input shaft
required for the Dodge transmission using this NV4500 bellhousing is Part No. 52-0221.
P/N 712571 - AMC engines to GM NV4500 (up to 1995)
P/N 712568 - AMC engines to GM or Dodge NV4500 (1996 & up)
(Dodge transmissions require a new input shaft)
(Note: 1987-89 YJ with the Peugeot transmission use a 11/16 master cylinder. This master cylinder will not work with the 716331
slave cylinder designed for these bellhousings, You will be required to change out your master cylinder on these applications.)
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jeep tranny retrofits (1987 & newer)