Specifications
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a new TH350 4WD output shaft. If you obtain the 4WD transmission, select the kit that
excludes the output shaft. All kits use a 3.65” aluminum adapter housing. The kits use a
spud shaft that is pressed on to a roller bearing and then pressed into the
adapter housing.
TH350 to Dana 300
50-6300 3.650” kit with TH350 shaft
adapter kit
50-6304 3.650” kit without a main shaft
adapter kit
Optional Items:
716021 Trans mount (or)
716017 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 introduced,
it quickly developed a bad reputation for certain weak-
nesses. 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% over-
drive. The overall length of this transmission 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 in the TH350 section.
This will allow for exhaust and firewall clearance. (Note:
We offer a 700R lockup bypass kit, P/N 24-700R). The
adapter length is 3.650” long to allow for front drive shaft clear-
ance on the transmission pan of the transmission. We offer two
kits depending on which transmission you get (2WD or 4WD).
The 2WD transmission will require the output shaft to be re-
placed and the 4WD transmission will retain the stock output
shaft. The 2WD kit has a 700R output shaft and a new spud shaft
supported by a bearing in our adapter housing. The 4WD kit
replaces the Dana 300 input shaft to a 27 spline input and uses
the stock 700R output shaft.
700R to Dana 300 Optional Items:
50-6303 3.650” 2WD 700R to Dana 300 kit 716021 Trans mount (or) 716017 Trans mount
50-6309 3.650” 4WD 700R to Dana 300 kit
4L60E: This transmission is identical to the 700R/4L60 except that it is an electronically controlled transmission. GM manufactures
this transmission in two versions. Both these transmissions use a reluctor ring connected to the GM engine computer for proper
shifting points. The first version is a mirror image of the 700R/4L60, but it requires the reluctor ring.
The second version is found in most of the 1997 & newer vehicles. The case and bellhousing are no longer cast together (now
a removable bellhousing design). This transmission no longer has the square bolt pattern on the output side, but is equipped with
a hex bolt pattern similar to a TH400. This transmission is 21-7/8” long, and is used in both 2WD & 4WD vehicles. We manufacture
an adapter plate that bolts to the output side of this transmission, giving it both the reluctor pickup and the same overall length as
the 700R.
4L60E to Dana 300 Optional Items: 716021 trans mount (or)
50-0404 4.650” 2WD or 4WD early style 4L60E to Dana 300 kit 716017 trans mount
50-0432 4.10” 4WD removable bellhousing 4L60E to Dana 300
(a 2WD version transmission can be used but requires a new output shaft to be installed)
We offer a stand alone computer system that operates the 4L60E transmission. P/N P4L110 allow this
transmission to be installed into numerous applications.
transmission types & t/c adapters (1980-86)