Advance Adapters 50-6401 User Manual

ADVANCE ADAPTERS INC. P/N: 50-6401

P.O. Box 247, 4320 Aerotech Center Way Old Part No: 711064-21
Paso Robles, CA 93447 PAGE 1 OF 3
Telephone: [phone] Fax: [phone] Page Rev. Date: 058-21-08

GM TH400 AUT OMATIC TO JEEP

NEW PROCESS - 21 SPLINE T/C

KIT CONSISTS OF:

No. Qty Part No. Description

1. 1 51-6401 ADAPTER HOUSING (Ref: 711164-SS)

2. 1 52-6400 TH400 OUTPUT SHAFT (21 Spl)(Ref: 711364-21)

3. 1 716165 SOFT PLUG

4. 1 716510 GASKET (GM #8624709)

5. 1 716517 GASKET

6. 1 716729 SEAL (NAT #456057)

7. 6 302071 HEX NUT 3/8"-24

8. 6 723740 S.H.C.S. 3/8"-16 x 1-1/2"

9. 1 JP001 JEEP INSTRUCTION MANUAL

OPTIONAL ITEMS:

Description

*716008 crossmember mount
*Jeep# 53004260 shift linkage

bracket (YJ Jeeps 1987-96)

*Stock brackets must be modified

on TJ and Cherokee applications.

This kit is used for replacement of AX4, AX5, AW4 and Peugeot transmissions with
21 spline output shafts.

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: 50-6401

P.O. Box 247, 4320 Aerotech Center Way Old Part No: 711064-21
Paso Robles, CA 93447 PAGE 2 OF 3
Telephone: [phone] Fax: [phone] Page Rev. Date: 09-29-06

GM TH 400 AUTOMATIC TO JEEP

NEW PROCESS - 21 SPLINE T/C

GM TURBO 400 3 SPEED AUTOMATIC

The GM TH400 has a case length of 24-3/4", 13 bolts for holding the oil pan in position and is available in 3 different engine
to transmission bolt patterns. Make sure you have selected the proper TH400 for your particular engine. The AMC TH400
case when used with the Chevy engine will require adapter Kit No. 716133. The rear side of the transmission case will
have a hex shaped bolt pattern that uses 6 bolts. There are several various lengths of output shafts that the transmission
has been equipped with, but all of our new output shafts will be interchangeable with your transmission.

Before assembling the new transmission output shaft into your transmission, you must verify that the transfer case input
sleeve size is compatible with the kit that you have ordered. The new shaft is available in both 21 and 23 splines and it is
very critical that you determine the correct shaft prior to transmission assembly. The new shaft supplied with your kit
should be installed by a competent mechanic. The speedometer gear is normally located in the tailhousing, but when
adapting it to the transfer case, the location will change to the backside of the transfer case. The rear transmission support
will now be located on the new adapter housing.

When installing the new transfer case adapter, make sure that the input gear and the output shaft do not bottom out. We
have found on occasion that a transfer case input gear may be slightly longer than we have allowed for; and when coupling
into our new shaft, you might find a small amount of interference. The adapter housing and shaft must be assembled to
the transfer case without interference. DO NOT FORCE THE NEW TAILHOUSING ONTO THE TRANSMISSION.
If assistance is needed, please feel free to call the number listed above.
transmission case, we have provided you with a new gasket to prevent fluid leakage. This gasket is a stock GM item that
is used on all TH400 installations.

When assembling the adapter housing to the

All installations will require the use of a transmission cooler. The cooler can be either installed in the radiator or a remote
location is acceptable. The transmission shift control can either be a Hurst floor mounted type shifter or sometimes the
existing column shift can be modified on certain applications.

ASSEMBLY INSTRUCTIONS: All fasteners should be secured with green Loctite

1. Trial fit the adapter against the TH400. If it will not fit flush against the transmission, then grind a small portion around
the speedometer gear housing.

2. The provided steel plug is used to close the original speedometer drive hole. Use a socket roughly the same I.D. as
the cup side of the plug and drive it into the case. All original speedometer parts must be removed prior to this step.

3. Install the new output shaft provided by Advance Adapters. This should be done by an experienced transmission
technician.

4. Apply silicone sealant to the TH400 to adapter gasket. Assemble the adapter to the transmission with the six 3/8"-16
x 1-1/2" socket head cap screws.

5. Check the stickout length of the output shaft with reference to the adapter housing. It should not stick out more than
1/4" (.250 in.).

6. Trial fit the transfer case to the adapter casting.

SEVERE DAMAGE WILL OCCUR . The input gear on the transfer case should have enough pocket to accept a 1/4"

(.250 in.) stickout.

7. Install the seal into the casting with open side of the seal facing the transmission.

8. Apply a thin coat of silicone sealant to the transfer case gasket. Install the transfer case and secure it with Loctite,
nuts and lockwashers.

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.

DO NOT "SUCK-UP" THE TRANSFER CASE WITH THE STUDS!