Specifications
TH350 Adapter to Dana
18/20 Transfer Case
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AUTOMATIC TRANSMISSION ADAPTERS:
We now offer rebuilt automatic transmissions with our adapter kits installed. To stand up to the stress
& strain put on most 4WD vehicles, these transmissions are built with the best heavy-duty
components available. We offer most makes and models for GM, Ford, and Jeep vehicles. These
transmissions are all dyno tested and come with a 2 year or 24,000 mile warranty. Call for applications
and pricing.
TH350: This GM automatic was commonly found stock in vehicles from 1969 to 1981. It was used in both the
4WD pickups and 2WD car applications. These transmissions are identical except when it comes to the output
shaft stickout length. The 4WD transmission used an adapter to bolt this transmission to its stock transfer case.
With this adapter removed, the stock output shaft protrudes from the back of the transmission case approximately
1”. On 2WD vehicles, these transmissions used 3 different tailhousings. The lengths of these tailhousings are
6”, 9”, and 12”. The output shafts lengths correspond with these tailhousing lengths. This transmission is one
of the most popular choices for engine and transmission conversions due to the overall length of 21-1/2”. The 1st gear ratio is 2.52:1;
2nd 1.52:1, and a 3rd gear ratio of 1:1. When converting with this transmission, we recommend that you cut the two tabs as illustrated.
This allows for exhaust and firewall clearance. When using this transmission on Jeeps that have a right hand front driveshaft, the
transmission should be offset 1” to the driver’s side for front driveshaft clearance.
The adapters we offer for this transmission are designed for the short 4WD output shaft. If you obtain a 2WD transmission then
you would be required to install a new rear output shaft. We offer kits that will supply you a new TH350 4WD output shaft . If you
obtain the 4WD transmission, select the kit that excludes the output shaft. All kits use a 1.875” aluminum adapter housing. These
kits use a spud shaft (either 6 or 10 spline) that is pressed on to a roller bearing and then pressed into the adapter housing. These
adapters do not come with the sealed transfer case bearing or index retainer. The front transfer case yoke can sometimes become
a clearance issue, so we do offer a smaller yoke kit to assist you if it does present a problem.
TH350 to Dana 18/20 & Scout 300 Optional Items: 716001 Large hole index retainer
50-3000 1.875” 6 spl. with TH350 shaft adapter kit 716002 Small hole index retainer
50-3001 1.875” 6 spl. without a main shaft adapter kit 716302 Sealed bearing
50-3100 1.875” 10 spl. with TH350 shaft adapter kit 716009 yoke kit
50-3101 1.875” 10 spl. without a main shaft adapter kit 716010 Modulator
50-3102 1.875” Scout Dana 300 23 spl. with TH350 shaft adapter kit 716003 Trans mount
50-3103 1.875” Scout Dana 300 23 spl. without a main shaft adapter kit 716021 Trans mount
700R: This is the first automatic overdrive that GM produced. Introduced in
1982, this transmission was offered in two different bellhousing / case designs
(60 & 90 degree bolt patterns). The internal components of these 700Rs can
be interchanged if necessary. When
this transmission was first intro-
duced, it quickly developed a bad
reputation for certain weaknesses.
In 1987, GM resolved all of the
problems that previously existed.
In the 1990s, the name of the 700R
transmission changed to 4L60.
These transmissions are ideal for
many conversions because of the 30%
overdrive. The overall length of this trans-
mission is 23-3/8”. It has a 1st gear ratio of 3.06:1;
2nd 1.62:1, and a 3rd gear ratio of 1:1. When convert-
ing using this transmission, we recommend that you
cut the two tabs as illustrated above. This will allow for
exhaust and firewall clearance. (Note: We offer a 700R lockup
bypass kit, P/N 24-700R). The adapter we offer for this
transmission to fit the Dana 18/20 is limited to only long wheel based vehicles. The adapter length is 6.25” long to allow for front
driveshaft clearance on the transmission pan of the transmission. This adapter uses a 2WD 700R output shaft and a 6 spline spud
shaft to the transfer case. This adapter does require a index retainer. We also offer an adapter to fit the 700R to the Quadra-trac
transfer case. This kit uses a stock 4WD output shaft that couples to a new spud shaft and aluminum adapter plate. If your transfer
case has a stock front CV joint, you will be required to change it to a standard yoke for front drive shaft clearance.
700R to Dana 18/20 or Quadra-Trac
50-6905 6.25” 6 spl. adapter kit
50-2501 Quadra-trac adapter kit
dana 18 & 20 t/c adapters (1941-79)