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february Tech Talk-aisin-8-speed

Transmission TECH/TALK

The World’s First FWD 8-Speed Transmission

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.

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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

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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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