FULLY REBUILT:  Proper Parts has re-engineered brand-new housings for these units and we recondition the internal parts. We've been building these gearboxes since 2006.  Our new housings are manufactured in the USA from extremely durable polyamide with fiberglass fill. The complete unit is assembled, tested, and shipped to you ready to be installed. It is Guaranteed for Life. 

IMPORTANT, PLEASE READ THIS: The power seat system is an antique. It is not an amusement park ride. It was NEVER designed for continuous use. Continuous use will overheat the bushings and lock or break the transmission. Move it to the position you like and leave it there. Do not repeatedly hit the end of the track going back and forth, and up and down. Unlike modern power seats that have current sensing, limit switches, and constant position monitoring, these systems do not even have a rubber cushion at the end of travel. Also, don't forget to check your Seat Track Glides!

THIS IS A UNIT EXCHANGE:

After installing your new unit, ship your old unit (core) to Proper Parts to receive your core refund. Your purchase receipt must be enclosed to process your refund.

Please do not ship your core until after you have finished installing the new one in order to avoid sending parts that you'll need to keep for installation.

Please return your core within 30 days.  After 45 days, a late fee of 15% will be charged.  Your core deposit will be refunded to your original payment method when we receive your core. 

What is an acceptable core?

The internal components are what is important. If the outer case is broken and in pieces, that is not important. We just need the internal parts. If you have any questions, please contact us in advance or send a photo. 

Black, Red, and Yellow Driving Gear / Input Shaft

Rolls-Royce and Bentley used the same part number UB-39167 to cover two different parts. You can tell the difference by looking at the color of the input shaft. These transmissions are coupled directly to the motor through a BLACK input shaft (or rarely white) and a black rubber coupler. 

The original housings were made of nylon. They were white when new but became brown and brittle over time, and many have disintegrated. Most failures are due to the housing breaking apart. There is no new OEM replacement available for this part.

NEW COUPLING INCLUDED, Part No: UB33078-S   Proper Parts has re-engineered an improved design that ensures a smooth slip fit to the motor and transmission. One end accepts a 3/8" D-shaft and the other end accepts a 5/16" D-shaft. It is ~1.25" long (31.5mm). We manufacture these couplings from a urethane chosen for its hardness and toughness while still having good flexibility. When the seat comes to the end of its track there is no cushion, and this coupling allows the motor to slow down gradually ensuring a longer life for all of the components involved. It is much better than the original. 

INSTRUCTIONS TO SHIP YOUR CORE TO PROPER PARTS:

• YOUR RECEIPT OR PACKING SLIP MUST BE ENCLOSED TO PROCESS YOUR REFUND.

• SHIP TO:  PROPER PARTS, 5725 HARRISON AVE, EXPORT PA 15632 USA.

• YOU ARE RESPONSIBLE FOR RETURN SHIPPING.

• EMAIL TRACKING # TO US THROUGH EBAY.