ADVANCE ADAPTERS INC. P/N: 50-3020A
P.O. Box 247, 4320 Aerotech Center Way New Item: (04-02)
Paso Robles, CA 93447 PAGE 1 OF 4
Telephone: (800) 350-2223 Fax: (805) 238-4201 Page Rev . Date: 02-28-14
JEEP & SCOUT DANA 20 T/C T AILHOUSING
32 SPLINE OUTPUT WITHOUT YOKE
KIT CONSISTS OF:
No. Qty Part No. Description
1. 1 300491 REAR YOKE END PLAY SHIM (3 sizes) (Installed by AA)
2. 1 300513 BEARING, REAR OUTPUT (YOKE SIDE) (Installed by AA)
3. 1 716303 BEARING, REAR OUTPUT (CASE SIDE) (Installed by AA)
4. 1 300625 SPEEDO RING GEAR (Installed by AA)
5. 1 300627 CIRCLIP, SPEEDO RING GEAR (Installed by AA)
6. 1 300104P SPEEDOMETER HOLE PLUG
7. 1 300629 SPEEDOMETER RETAINING CLIP
8. 1 300630 O-RING FOR SPEEDOMETER
9. 1 300922 BREATHER, BRASS ELBOW (Installed by AA)
10. 1 51-3020 CASTING (Installed by AA)
11. 1 52-3020 SHAFT (Installed by AA)
12. 1 301403 BOLT- 5/16"-18 x 3/4" H.F.C.S. SPEEDOMETER CLIP BOLT
13. 4 723730 S.H.C.S. 3/8"-16 x 1-1/4"
14. 1 723713 3/8"-16 x 1.25" STUD BOLT
15. 1 723701 3/8"-16 NUT
NOTE: This kit is 1.5" longer than stock.
THIS KIT SHOULD BE SOLD WITH A YOKE KITS THAT INCLUDES A SEAL, NUT, SAEL WASHER,
& YOKE. THIS KIT ALLOW ANY ADVANCEADAPTERS YOKE TO BE INSTALLED ON THE TAIL
SHAFT KIT.
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: 50-3020A
P.O. Box 247, 4320 Aerotech Center Way New Item: (04/02)
Paso Robles, CA 93447 PAGE 2 OF 4
Telephone: (800) 350-2223 Fax: (805) 238-4201 Page Rev . Date: 04-24-02
JEEP & SCOUT DANA 20 T/C T AILHOUSING
32 SPLINE OUTPUT WITHOUT YOKE
The Dana 20 H.D. output shaft kit is a very simple kit to install. The transfer case can be left in the vehicle for the installation
of this kit. Driveshaft modifications will be required due to the 1.5" longer output shaft housing. The use of this kit gives
you the advantage of calibrating you speedometer for tire and axle variations.
Remove the (5) fasteners from the stock tailhousing. Remove the tailhousing from the Dana 20 transfer case. The stock
tailhousing used a gasket between it and the transfer case. Make sure the gasket is removed
completely from the transfer case surface. When comparing the old Dana 20 tailhousing to
the new, there are a couple of changes to our tailhousing that you will need to compensate for.
The first is the length of our unit which is 1.5" longer, so driveshaft modifications will be
required. Second, the speedometer drive on our tailhousing is designed around the later model
Jeep tailhousings. This speedometer drive allows you to adjust your speedometer to
compensate for larger tires and axle ratio changes. Third is the breather assembly. The stock
tailhousing has a metal breather mounted to the top of the tailhousing. Our tailhousing is
designed with a brass elbow. Our tailhousing requires a piece of 3/8" fuel hose to be clamped
to the brass elbow and a breather to be installed at the opposite side of the hose. We also
recommend that this hose be long enough to extend up into the engine compartment to avoid
any type of water contamination.
We designed our kit to bolt to the Dana 20 without a gasket. We recommend using a very thin film of RTV blue silicone.
Apply a small dab and smooth it out with your finger. Our tailhousing also requires the use of a stud bolt located at
approximately 8 o'clock on the case. The stud bolt must be installed so that only .600" is protruding from the case. Make
sure the bolt does not go too far into the case and interfere with the Dana 20 gear. Our tailhousing bolt hole that corresponds
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: 50-3020A
P.O. Box 247, 4320 Aerotech Center Way New Item: (04/02)
Paso Robles, CA 93447 PAGE 3 OF 4
Telephone: (800) 350-2223 Fax: (805) 238-4201 Page Rev . Date: 06-10-09
JEEP & SCOUT DANA 20 T/C T AILHOUSING
32 SPLINE OUTPUT WITHOUT YOKE
to the stud bolt has a milled pocket into which the 3/8"-16 nut must be set into. As you assemble the tailhousing to the
case, thread the nut to the stud.
Stud bolt and nut being installed
on the new tailhousing
New tailhousing being installed. Be sure
to check spline alignment between our
shaft and your stock gear.
New tailhousing installed. The new bolts
need to be torqued to 30ft./lbs. Turn the
yoke to make sure the unit is not bound up
or is not binding.
Fill your unit with the recommended oil.
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: 50-3020A
P.O. Box 247, 4320 Aerotech Center Way New Item: (04-02)
Paso Robles, CA 93447 PAGE 4 OF 4
Telephone: (800) 350-2223 Fax: (805) 238-4201 Page Rev . Date: 06-10-09
JEEP & SCOUT DANA 20 T/C T AILHOUSING
32 SPLINE OUTPUT WITHOUT YOKE
Speedometer Calibration: There are two factors that affect your speedometer reading; actual tire diameter and axle gear
ratio. The actual tire diameter is usually different than what is printed on the side wall of your tire. For example: A 33 x 11.5
x 15 tire (depending on the brand), may actually measure 32.5" in diameter. Tire sizes vary greatly among the suppliers. Even
the same tire from the same manufacturer can vary as much as 7% in diameter.
ADVERTISED TIRE DIAMETER
37" 36" 35" 33" 32" 31" 30" 29" 28"
5.13 36T 37T
4.88 34T 35T 39T 41T
GEAR 4.56 32T 33T 35T 36T 37T 37T 38T
RATIO 4.10 29T 30T 33T 34T 35T 36T 37T 38T 39T
3.73 26T 27T 31T 32T 32T 33T 34T 34T 35T
3.55 30T 31T 31T 32T 33T 33T 34T
3.07 26T 26T 27T 27T 28T 28T 29T
Listed below are a few of the part numbers for the Jeep speedometer pinion gears to calibrate your speedometer.
53001-492 (29T)
53001-488 (41T)
2538-936 (36T)
J3212-730 (30T)
J3212-731 (31T)
J3212-733 (33T)
J3212-734 (34T)
J3212-735 (35T)
J3212-221 (39T)
J3212-222 (40T)
This tailhousing offers a speedometer option (sold separately). This tailhousing is designed to fit a stock Jeep (1983-86)
mechanical driven speedometer housing. Vehicles requiring a cable connection for the speedometer can order P/N
301506. The speedometer gear is not included with this housing, but by using the charts above you can select the correct
gear for your tire size and axle ratio.
If your stock cable does not fit this speedometer housing or if you require additional speedometer connections, then we
recommend that you contact Nevada Speedometer at (775)358-7422.
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.
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