Advance Adapters 50-6400 - Manual (Page 2)

ADVANCE ADAPTERS INC. P/N: 50-6400
P.O. Box 247, 4320 Aerotech Center Way Old Part No: 711064
Paso Robles, CA 93447 PAGE 2 OF 3
Telephone: (800) 350-2223 Fax: (805) 238-4201 Page Rev. Date: 03-14-01
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.
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 these transmissions
has been equipped with. Our new output shaft will be interchangeable with your transmission. 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 or, in some cases, on the transfer case.
When installing the new transfer case adapter, 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 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.
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.
The adapter thickness is 4-3/8" and will normally require the transfer case to be relocated on most conversions. Kit No.
50-6402 uses a thinner adapter plate that is only 1-1/4" thick and can be installed in Jeep Wranglers only. This kit is available
in both the 21 & 23 spline TH400 output shaft.
INSTALLATION:
1. The transmission output shaft provided in this kit must be installed in the TH400 before the adapter can be used.
2. This kit comes pre-assembled with the bearing, snap rings, and spud shaft installed in the casting. The bearing and spud shaft
are a press fit. The spud shaft is pressed to the bearing and the snap ring installed to retain the spud shaft properly. The bearing
and spud shaft assembly are also a press fit into the adapter housing. The bearing and spud shaft are pressed into the casting
from the transmission side. Take note that the external splined side of the spud shaft is facing the circular side of the adapter.
This assembly is retained with the provided snap ring.
3. Trial fit the adapter assembly on the TH400 transmission, checking for any shaft interference. Also check the adapter assembly
onto the Dana 300 transfer case.
4. Using a silicone sealant on the gasket, fasten the adapter assembly to the TH400 transmission using the (6) 3/8-16 x 1 1/2 bolts
and lock washers.
5. The adapter has two possible transfer case rotations, stock being 35 degrees. Select the rotation best suited for your vehic le.
6. Use a silicone sealant on both sides of the transfer case gasket. Aline the gasket and slip the two components together.
Depending on the rotation you chose either use the (6) 3/8-16 x 1 1/4 bolts or it may be necessary to use a stud bolt and 5 of
the 3/8-16 x 1 1/4. The stud bolt is used on one of the bottom holes since the casting will not allow a standard bolt.
7. Use Loctite on all fasteners.
GM TH400 AUTOMATIC TO
JEEP DANA 300 TRANSFER CASE