ATP HO-8

ATP HO-8 is an automatic transmission extension housing seal. It seals the point where the output shaft or slip yoke passes through the rear transmission housing and helps retain ATF.

Application / fitment

HO-8 has broad coverage across selected automatic transmissions in AMC, Chrysler, Dodge, Ford, General Motors, Jaguar and other vehicles. Catalogues list cross-reference numbers including National 7300S, 7038SA and 3173. Different housings and shafts require selection by transmission number and the removed seal dimensions.

• part type: automatic transmission extension housing seal
• location: rear extension housing
• selected catalogue makes: AMC, Buick, Cadillac, Chevrolet, Chrysler, Dodge, Ford, GMC, Jeep and Lincoln
• cross-reference numbers: National 7300S, 7038SA, 3173 and 450374
• catalogue OE numbers: Ford C3AZ-7052-A and D5AZ-7052-A
• UPC: 740993010500

Compare shaft diameter, housing bore, width and profile with the removed part. Published HO-8 dimensions conflict between catalogues, so fitment must not rely on one online measurement. Also inspect the housing bushing clearance and yoke sealing surface.

Technical information

• type: radial transmission shaft seal
• function: retains ATF in the extension housing
• working material: oil-resistant elastomer
• construction: metal case with flexible sealing lip
• dimensions: verify on the actual part due to catalogue discrepancies
• repair bushing: not included
• catalogue condition: new
• sale unit: 1 seal