Specifications

P/N 50-2501
25
dana 18 & 20 upgrades (1941-79)
P/N 50-1300
JEEP DANA 18 & 20 T/C UPGRADE COMPONENTS:
JEEP DANA 20, 32 SPLINE OUTPUT SHAFT KIT:
The Dana 20 transfer case is a good, strong cast iron transfer case; however, with the introduction of
the various low gear options for this unit and the popularity of rock crawling, a growing concern for
drivetrain reliability has materialized. Since low gear kits increase the torque to the output shaft and
rock crawling usually demands tire size, we’ve developed a heavy-duty rear output shaft kit for the
Dana 20 transfer case to add strength and reliability to your drivetrain. Our kit fits all Dana 20 transfer
cases with or without a low gear kit installed. The stock Dana 20 output shaft is a 1-1/8” diameter
10 spline, and our new output shaft is a larger 1-3/8” diameter 32 spline output. The output shaft kit
is approximately 1.5” longer than your stock tailhousing; however, you do gain the option of calibrating
your speedometer to compensate for a different axle ratio and/or larger tires. Our kits come complete with
a new tailhousing, output shaft, tapered roller bearings, yoke, and speedometer drive. When you require strength and reliability,
install the Advance Adapters H.D. Dana 20 output shaft kit.
P/N 50-3020 - Heavy duty 32 spline Dana 20 output shaft with 1310 non C.V. yoke.
P/N 50-3020A - Heavy duty 32 spline Dana 20 output shaft kit without yoke.(see Atlas T/C for yoke option)
JEEP DANA 18/20 INTERMEDIATE GEAR KIT:
These kits are available for Jeep transfer cases 1946-53 (with an 1-1/8” intermediate shaft), or
1953-79 (1-1/4”) to fit the stock cluster gear. These kits use tapered roller bearings and a new
shaft that aids in the noise reduction of your stock transfer case. Machining is required on your
cluster gear.
P/N 716006 - 1-1/8” Kit
P/N 716005 - 1-1/4” Kit
JEEP DANA 18 GEAR KNOBS KIT:
We offer replacement knobs for the Dana 18 twin stick transfer case. P/N 715643
DANA 18/20 3.15:1 LOW GEAR SETS (6 Spline Input only):
Kits are available for both the Dana 18 and Dana 20 transfer cases. These kits are shipped complete with the necessary hardware
and gaskets to obtain the 3.15:1 low gear ratio.
The Dana 20 kit fits transfer cases 1963 to 1979 in CJs, Jeepsters, Jeep trucks, Wagoneers, and 1972 to 1979 Scouts. This is
a 5-gear low range kit replacing the stock 2.03:1 gears. A slight amount of internal case grinding
is necessary. P/N 420315.
The Dana 18 kit, P/N 418315, fits large hole transfer cases only. This 4-gear kit
requires the shortening of the shift rod for intermediate gear clearance. A slight amount
of internal case grinding may be necessary. CJs 1965 & older will require the use of
a case from either a 1966 to 1971 CJ, 1963 to 1979 Wagoneer/pickup (Dana 20), or
a 1972 to 1979 CJ (Dana 20). If a Dana 20 T/C is to be used with the Dana 18
components, you will still be able to retain your stock driveshaft offset. For Warn and
Saturn O.D. owners, we offer a complete gear set to retain your overdrive using the
3.15:1 low gears, Part No. 418315OD. We also offer just the Saturn Overdrive bowl gear if you have
already obtained your low gear set, P/N 911098.
C. Borg Warner Quadra-Trac (1972-1979): This is a chain-driven transfer case used with
the AMC Turbo 400 automatic transmission. The Turbo 400 has a 10 spline super-long output shaft that
simply slides into the input gear of the transfer case. When changing to a Dana 18/20 transfer case, you will
need to use Kit No. 50-0500 or 50-1300, which will require a new Turbo
400 shaft to be installed into your transmission along with the new adapter
housing. We recommend using the Dana 18 transfer case since it has the same
rear driveshaft offset as the Quadra-Trac.
We also offer a kit, P/N 50-2501, to adapt the 700R4 to the Quadra-Trac
transfer case. Since this transfer case is a full-time 4WD unit, the front yoke
is normally a C.V. style. If installing a 700R to this transfer case, the C.V.
yoke may cause interference. The easiest fix for this problem is to change
to a standard yoke assembly. The overall length of this combination is
identical to the TH400.