National 105147

National 105147 is a torque converter hub radial shaft seal for an automatic transmission. Its fluoroelastomer lip operates at the front of the transmission and limits ATF leakage between the converter hub and front-pump housing.

Application / fitment

Select the seal by part number and the converter-hub and housing-bore dimensions. Dimensions alone do not confirm a specific transmission model, so compare the removed seal and transmission repair documentation.

• part type: torque converter hub shaft seal
• position: automatic-transmission front pump
• operating fluid: automatic transmission fluid / ATF
• fitment method: dimensional and by National 105147 part number
• converter hub or shaft: 1.378 in / 35.00 mm
• housing bore: 1.890 in / 48.00 mm; seal outside diameter 1.906 in / 48.40 mm

Inspect the converter-hub surface for wear grooves, corrosion and runout. Lubricate the sealing lip with the specified ATF and press the seal squarely with the correct driver. Do not reverse the helical lip direction or substitute a seal with a different oil-pumping design.

Technical information

• part type: torque converter shaft seal
• design type: National Type 32
• lip material: fluoroelastomer
• shaft / hub diameter: 1.378 in / 35.00 mm
• housing-bore diameter: 1.890 in / 48.00 mm
• seal outside diameter: 1.906 in / 48.40 mm
• width: 0.276 in / 7.00 mm
• lip design: clockwise spiral helix
• position: front of automatic transmission
• selection method: part number and complete dimensional match
• sale unit: 1 piece