Aisin Warner 55-50 SN Filter Differences

AW55-50SN and AW55-51SN is a 5 speed front wheel drive automatic transmission manufactured by Aisin Warner for Nissan, Volvo, Saturn and GM vehicles.

There are three different variation of filters for this unit.

The one for the Volvo and the Saturn does not have a rib (part no. A89010D) and the one for the Nissan has a rib (part no. A89010C.  The Chevrolet Equinox uses a different one (part no. A89010E).

4R70W Accumulator Pistons

The Ford AODE and the 4R70W have a common issue with the 2-3 accumulator, they go bad.

To address this issue the accumulator now comes bonded. These parts will retrofit all the way back to 1980 covering the AOD, AODE, 4R70 and 4R75 series transmissions.

When replacing the 1-2 and the 2-3 accumulators in this unit here is what you need:

1-2 Accumulator Piston part number 76927B
1-2 Accumulator Cover part number 76929A
2-3 Accumulator Piston par number 76932EA

While in the unit most of my clients also change the the Low/Reverse Servo Piston and Cover.

For the low-reverse piston you will need to identify it by the amount of grooves at the end of the piston.

76912 has one groove.
76912A has two grooves
76912B has three grooves

76914 is the cover and works with any of the three pistons. So you will need one of the pistons (depending on the grooves) and one cover. 

There are several options for the accumulator springs and are color coded.  Once you have the color identified head over to our site and in the search box type 79926 to see the different springs.

Ford 6.9L Diesel T19 Kit Differences

Although the T19 Standard Transmission was used in several years and engine size this post will specifically cover the Ford F Series Pickup Truck from 1983 to 1987 equipped with the 6.9L Diesel engine.

This vehicle came with two variations of the T19, one with the 20mm wide input bearing and the other with the 23mm wide input bearing.  In order to know you would need to take the unit apart.

In the event you are not sure or you don't want to take the unit apart until you have the kit here are the parts you will need to purchase in order to cover both possibilities.

1 x BK146WS - Bearing, Gasket, Seal and Synchro Kit
1 x 304240 - Bearing

This will insure you have the other bearing.  In this instant you will have an extra bearing at the end of the build.

The bearing pictured below is the 23mm wide bearing part number 304240.