TH400 to Dana 300 - 1.25" thick plus Rotation Plate
Kit Components
Kit #10-1010 -- $575.00
NOTES:
- ADAPTER THICKNESS - 1.25" BILLET ALUMINUM
- ROTATION PLATE THICKNESS - 0.75"
- INCLUDES NEW 32 SPLINE INPUT GEAR FOR THE DANA 300
- OFFERS IMPROVED DRIVESHAFT CLEARANCE WITH ELEVATED CLOCKING OF THE DANA 300
- UTILIZES STOCK GM 4X4 SHORT OUTPUT SHAFT
- DOES NOT USE SEALED BEARINGS OR SPUD SHAFTS
- GRADE 8 - 12 POINT BOLTS ARE SUPPLIED IN THIS KIT
Features which set our adapter apart from others are reflected in the quality of the machine work exhibited in the kit components. The adapter plate is machined from a solid block of T6061 aluminum and measures a short 1.25" thick. A total length of 2" is achieved when combined with the 0.75" rotation. Competitor's adapters for this application will measure nearly 5" long when paired with common rotation plates.
Photo of complete units back to back
The use of this adapter kit requires the TH400 to be equipped with the short GM 4x4 output shaft. This short output shaft can be found in NP203/TH400 applications.
Photo of output shafts
The kit includes a new 32 spline input gear for the Dana 300 and a billet rotation plate. Most adapter kits on the market utilize stock GM 2WD shafts which are cut down in size and resplined to match the smaller 23 spline input found in the stock Dana 300. Unlike these other adapter kits, our adapter kit retains the high strength offered by the 32 spline GM shaft.
Photo of input gear and rotation plate closeup
Spline Engagement:
Our adapters are designed to be short in length however we do not sacrifice spline engagement in any case. As mentioned, this adapter kit is designed to be used with the short style output shaft (32 spline) found in the 4x4 TH400. JB Conversions, Inc. can provide this GM shaft if you do not have one. Notice the fully engaged spline in the photo below.
Photo of spline engagement
The adapter is equipped with a new oil seal as shown in the phote below. This new seal combined with the existing seal in the stock Dana input bearing retainer, provides a true double seal against interchanging of fluids between the transmission and transfer case.
Photo of seal details
Driveshaft Clearance:
Driveshaft considerations must be given to the use of any Dana 300 mounted behind a TH400. The improved clearance offered with this kit allows ample room for a 1.25" or 2.00" driveshaft diameter.
Driveshaft photo 1
Driveshaft photo 2