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JB Conversions Dana 300 32 Spline Rear Output Shaft
Some information by JB Conversions


The original Dana 300 rear output shaft is not as strong as it could be. 4-to-1 gears, larger tires, and V8 engines have been responsible for many OEM shaft failures on stock Dana 300's. Other aftermarket companies have put together shaft kits to address this problem however we feel that our kit is beyond compare. This kit is offered by our company as a compliment to the full line of JB Conversions, Inc. products for the Dana 300.


Stock shaft vs. JB Conversions shaft


Stock housing vs. JB Conversions housing

The Dana 300 Big Shaft kit contains several features not available from kits made by competitors. The housing is heat treated aluminum with a very thick top section. A 6-bolt mounting flange with two 3/8" dowel pin holes has been integrated into each aluminum housing. The top section of the housing has been especially designed to accommodate a parking brake with this 6-bolt flange face. If a parking brake is not used, a billet cap and seal is supplied with the kit.

Another feature which sets this kit apart from the rest is the the ability to adjust shaft end play or bearing preload. A shim pack is included in each kit which allows perfect adjustment of end play. An extra shim pack is supplied in the event of a future rebuild or bearing change.

NOTE: Other kits on the market are furnished with pre-machined thrust washers to achieve correct end play. We don't think this is the best design. The competitors thrust washers are machined to provide specific shaft end play based on the specific bearing installed in their kit as it leaves their facility. With this type of thrust washer, there is no way to allow for slight size differences in bearing size in the event that your Dana 300 is ever freshened up with new bearings. We have seen slight variations between bearings of different brands and also within the same manufacturer.

This kit comes with a 1310 CV yoke (reference Spicer Part No. 2-4-5341) however 1 ton yoke sizes are compatible. We do not supply larger yokes, however, the following part numbers are compatible with this kit:

  • 1310 non-CV Yoke: Spicer 2-4-4191, National Seal number 472015
  • 1330 CV Yoke: Spicer 2-4-5441, National Seal number 473239
  • 1330 non-CV Yoke: Spicer 2-4-5521, National Seal number 472015
  • 1350 non-CV Yoke: Spicer 3-4-6211, Natioanl Seal number 472015
  • 1410 non-CV Yoke: Spicer 3-4-10951-1, National Seal number 472015


kit contents


Kit Components
Aluminum bearing housing
32 spline rear output shaft
Aluminum seal retainer
National oil seal #473239
(6) Allen cap screws 5/16" x .75"
(5) Allen cap screws 3/8" x 1.25"
CV yoke # 2-4-5341
7/8" x 20 Lock nut - Chrysler #4167924
Rubber star washer seal - Chrysler #4210973
Speedometer gear - Chrysler #4338996
Snap ring - Chrysler #4338997
Large Spacer ring
Small Spacer ring
Needle bearing
Tapered roller bearing #30207 (cup & cone)
Tapered roller bearing #26822, #26885 (cup & cone)
Shim set
Vent fitting 1/8" NPT x 5/16"

Contact JB Conversions for more information

 

 

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