The World's First FWD 8-Speed Transmission - Transmission Digest

The World’s First FWD 8-Speed Transmission

In this February Tech Talk article, Wayne Colonna breaks down the AWF8F35, developed by the Aisin Group.

AWF8F35; GA8F22AW; 8F45; U880F; TG-81SC

Introducing the world’s first front wheel drive 8-speed transverse mounted automatic transmission developed by the Aisin Group called the AWF8F35 (Figure 1). This transmission is currently being used in BMW, GM, Toyota/Lexus and Volvo applications. Each manufacturer using this transmission will assign its own designation. BMW calls it the GA8F22AW transmission. GM refers to it as their 8F45. Toyota/Lexus calls it their U880F transmission, while Volvo refers to this transmission as their TG-81SC replacing the TF-80SC.  The transmission used in this newsletter is a U880F.

Figure 1

BMW:  

·2015 BMW 2 Series Active Tourer (F45) and Gran Tourer (F46)

·2016 BMW X1 (F48)

 ·2016 Mini Clubman (F54) with 4-cylinder engines

GM:    

  ·2016 Chevrolet Malibu

TOYOTA/LEXUS:

   ·2013 Lexus RX50 F Sport

VOLVO:

   ·2014–2016 Volvo S80 II

   ·2014–2016 Volvo V70 III

   ·2015–present Volvo S60 II

   ·2015–present Volvo V60

GEAR RATIOS:

1st            2nd          3rd          4th           5th          6th          7th           8th          Rev.       Final Drive

5.200        2.971       1.950       1.469       1.223       1.000       0.817       0.685                      4.498

5.250        3.029       1.950       1.457       1.221       1.000       0.809       0.673       4.015      3.075, 3.200

Figure 2

To assist you in having some technical information to become familiar with this widely used transmission, a component application chart can be seen in Figure 2 while Figure 3 provides solenoid location and identification. Figures 4 and 5 show the valve line-ups in the valve body with valve and spring I.D. in Figure 6. Figures 7 and 8 show small parts locations in this valve body with Figure 9 giving to case passage identification.

Figure 3

Figure 3 Legend:

Solenoid and TFT Specifications:

The SL1 and SL2 Solenoids are normally closed solenoids blocking pressure to their respective circuits. These two solenoids measure 11 to 15 ohms at 68° F.

Figure 4

The SL1, SL2, SL3 SL4, Sl5 and the SLU solenoids are normally vented solenoids venting pressure in their respective circuits. These solenoids measure 5.0 to 5.6 ohms at 68° F.

Figure 5

The SLT solenoid is a normally applied solenoid supplying pressure to its respective circuit. This solenoid measure 5.0 to 5.6 ohms at 68° F.

Basic TFT resistance range will be 5 to 8K at 50°F and 0.22 to 0.28K at 230°F.

Figure 7
Figure 8
Figure 9

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