A/T - A130/A140 Modifications For Improved Lube

TECHNICAL BULLETIN # 105

TRANSMISSION: A130-140 Series

SUBJECT: Modification For Improved Lube

APPLICATION: Toyota




Many Toyota lube failures begin with wear on the front tip of the output shaft and wear in the bore in the rear of the forward drum. The wear is caused by the output shaft contacting the wall of the bore in the rear of the forward drum. Once this occurs, the ring on the shaft can no longer seal, the lube oil leaks away, and failure, due to lack of lube occurs. This is a very common cause of overdrive planet failure in A-140's. The following pages describe a modification to help prevent this situation.

Basically, the modification is to fit a high quality bushing into the rear of the drum and turn down the tip of the output shaft to eliminate the ring groove and allow the output shaft to fit into the fabricated bushing.

The new bushing will act not only as a lube seal, but will also offer some support to the Output shaft.

The 3 operations for this modification are:

1. Turn output shaft
2. Turn bore of forward drum
3. Fabricate bushing




OUTPUT SHAFT MODIFICATION




FORWARD DRUM MODIFICATION


3. FABRICATE TEFLON BUSHING







CAUTION
The material used for the bushing is listed below. Although there may be other materials suitable for this application, this particular material has been field tested for over 4 years with excellent results. Consult your local plastics supplier/dealer for teflon stock. This material is manufactured by DuPont and is available in 1" diameter extruded rods.


Virgin Teflon PTFE
Continuous service temp 500 degrees F
Melting point 650 degrees F

Use of sub-standard material for bushing fabrication may result in immediate severe damage.