Advance Adapters 50-7501 User Manual

ADVANCE ADAPTERS INC. P/N: 50-7501

P.O. Box 247, 4320 Aerotech Center Way Old Part No: 711075-21
Paso Robles, CA 93447 PAGE 1 OF 3
Telephone: [phone] Fax: [phone] Page Rev. Date: 08-07-08

FORD T18 4-SPD TRANSMISSION TO

JEEP NP231 TRANSFER CASE (21 SPLINES)

KIT CONSISTS OF:

No. Qty Part No. Description

1. 1 51-7500 ADAPTER CASTING (Ref: 711175)

2. 1 52-7504 T18 MAIN SHAFT WITH 21 SPLINES (Ref: 711375-21)
3 . 1 Pack 714202 BOLT PACK (50-7500)

4. 1 716452 SNAP RING (Jeep #8132631)

5. 1 716512 GASKET (NP435)(T18)

6. 1 716517 GASKET (Dana 300)

7. 1 716722 SEAL (NAT #472319)

8. 1 JP001 JEEP INSTRUCTION MANUAL

NOTE:

This kit should be used for replacing Jeep AX4, AX5 and AW4
transmissions.

The T18 shafts had two main
shaft designs. The difference
between the shafts is the
hub between the second
and third gears (both de­signs are interchangeable
into the transmission). Some
shafts have a snap ring and
washer and others have the
spacer as part of the shaft.
Most of our shafts have the
hub as part of the main shaft.
If you have the snap ring de­sign, just omit the washer
and snap ring when loading
the gears on the new main
shaft.

SPECIAL NOTE: The components packaged in this kit have been assembled and machined for specific type of conversions. Modifications to any of the components will
void any possible warranty or return privileges. If you do not fully understand modifications or changes that will be required to complete your conversion, we strongly recommend
that you contact our sales department for more information. This instruction sheet is only to be used for the assembly of Advance Adapter components. We recommend that a service
manual pertaining to your vehicle be obtained for specific torque values, wiring diagrams and other related equipment. These manuals are normally available at automotive
dealerships and parts stores.

ADVANCE ADAPTERS INC. P/N: 50-7501

P.O. Box 247, 4320 Aerotech Center Way Old Part No: 71 1075-21
Paso Robles, CA 93447 PAGE 2 OF 3
Telephone: [phone] Fax: [phone] Page Rev. Date: 08-14-02

FORD T18 4-SPD TRANSMISSION TO

JEEP NP231 TRANSFER CASE (21 SPLINES)

WARNER T18 4 SPEED 1966 & UP:

The T18 & T19 transmission can be identified by a case length of 11-7/8", and a case casting number of T18 or 13-01,
and T19 or 13-09. The shift cover has a casting number of 13-01 or 13-09. The P.T.O. opening is on the right hand side
towards the front of the case and the shift cover is mounted to the top of the case with six bolts. The new shaft furnished
with this kit must be carefully compared to the original shaft removed from your transmission. The T18 & T19
transmissions required for this kit are from Ford 1/2, 3/4 and 1 ton trucks. The front bolt pattern on the Ford transmissions
will have an 8-1/2" x 6-1/4" bellhousing pattern with a bellhousing pilot diameter of 4.848".

The assembled length of the transmission and adapter will vary depending on which installation you are doing. On certain
Jeep applications, we have set the length up to be an exact replacement of the original T4 & T5 transmissions.

Before you begin to assemble your transmission, you must make sure that you have received the correct main shaft. The
spline on the end of the shaft must have 21 teeth. Since we manufacture two different T18 main shafts, it is possible that
you could receive the 27 or 23 spline in error.

When assembling the gears onto the new main shaft, make sure that all gears have the proper end clearance required for
oiling. Make sure that all transmission assembly work is done by a competent mechanic. All surfaces must use gaskets
to prevent oil leakage. Warner gear has used two different shaft designs for the spacer between second and third gear.
Some transmissions will use a snap ring and thrust washer, while others will use a built in shoulder. Both shafts are
interchangeable.

When bolting the adapter to the main transmission case, you must use two studs in the upper two holes of the adapter. A
slight modification may be necessary to obtain the proper clearance around the lower

On installations using a 2 piece main shaft, make sure that the coupler and the output shaft do not bottom out. We have
found on occasion that a transmission output shaft may be slightly longer than we have allowed for; and when coupling
into our new spud shaft, we have found a small amount of interference. The adapter housing and spud shaft must be
assembled to the back of the transmission without interference. DO NOT FORCE THE NEW TAILHOUSING ONTO

THE TRANSMISSION. If assistance is needed, please feel free to call the number listed above.

The new seal provided with the adapter kit must be installed with the open side towards the transmission. With the adapter
and transmission assembled, you are now ready to bolt the transfer case into position. We have included a new gasket for
added protection. Be sure to use RTV Blue Silicone on both sides of the adapter & gasket.

The skid plate will need to be slightly modified to fit under the new transmission. Two new holes may be necessary for
use with the new adapter and a slight notch may be required on the front leading edge of the skid plate for clearance around
the front driveshaft.

When this transmission is going to be used with an AMC 6 cylinder or V8 engine, you must use Jeep bellhousing No.
8133951 and Advance Adapters pilot bushing No. 716156. The clutch disc should be changed to an 10-1/2" Centerforce
No. 384180.

idler shafts

of the stock transmission.

SPECIAL NOTE: The components packaged in this kit have been assembled and machined for specific type of conversions. Modifications to any of the components will
void any possible warranty or return privileges. If you do not fully understand modifications or changes that will be required to complete your conversion, we strongly recommend
that you contact our sales department for more information. This instruction sheet is only to be used for the assembly of Advance Adapter components. We recommend that a service
manual pertaining to your vehicle be obtained for specific torque values, wiring diagrams and other related equipment. These manuals are normally available at automotive
dealerships and parts stores.