Specifications

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jeep tranny retrofits (1980-86)
1980-86 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 (Jeep P/N 8133951,
3236291 or AA P/N 712599). These bellhousings are normally found coupled to T150 & T176 trannys in Jeeps 1976-1983. 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 716156 - AMC pilot bushing (required for all applications)
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)
P/N 712599 - AMC stock T150 and T176 bellhousing (for early Jeep engines)
Ford T18 T/C Adapters Ford NP435 T/C Adapters
50-7500 Dana 300 23 spl. 50-3801 Dana 300 & NP flush 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
50-9702 Dana 300 23 spl. 50-9810 4WD trans Dana 300 adapter
50-9807 2WD trans Dana 300 adapter
(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)
If the overall length is not a concern or you’re looking for the easiest adaptation, we also offer an adapter plate for these transmissions.
The adapter is based around the Dodge transmission and the length of the Dodge input shaft. The Dodge transmission input shaft
has a stickout length of 7-1/2”. This allows us to use an adapter plate and then couple it to the stock AMC bellhousing.
P/N 712553 - AMC engines (using Jeep bhsg. 8133951 or 3236291) to Dodge NV4500
AX15 and NV3550 to DANA 300: These transmissions are for Jeeps 1980-1986, equipped with a Dana 300 transfer
case. The case length is 16-3/4” long and has a stock bellhousing length of 7-1/4”. When replacing a T5, T4 & SR4 and keeping
the stock engine, these transmissions are a 2” longer transmission assembly. When adapting to the Dana 300, we offer two options
for the NV3550 and one for the AX15 transmissions.