Advance Adapters 50-6402 - Manual (Page 2)

ADVANCE ADAPTERS INC. P/N: 50-6402
P.O. Box 247, 4320 Aerotech Center Way Old Part No: 711064-23
Paso Robles, CA 93447 PAGE 2 OF 3
Telephone: (800) 350-2223 Fax: (805) 238-4201 Page Rev. Date: 09-29-06
GM TH400 AUTOMATIC TO JEEP
NEW PROCESS - 23 SPLINE T/C
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.
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 or, in some cases, on the transfer case.
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.
When installing the new transfer case adapter, make sure that the input sleeve 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 find 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.
When assembling the adapter housing to the 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.
If you have selected a transmission that has the old style modulator, then we recommend the use of the Advance Adapter
adjustable modulator, Part No. 716010. This will also allow for additional driveshaft clearance.
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. DO NOT "SUCK-UP" THE TRANSFER CASE WITH THE STUDS!
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.