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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 6

Figure 6 Legend:

1.   B1 Brake (Band) Accumulator

2.   B1 Brake Accumulator Outer Spring – 1.107”x.438”x.068”x8c

3.   B1 Brake Accumulator Inner Spring – 1.137”x.308”x.045”x13c

4.   Retainer

5.   C4 Clutch Accumulator

6.   C4 Clutch Accumulator Outer Spring – 1.107”x.438”x.068”x8c

7.   C4 Clutch Accumulator Inner Spring – 1.137”x.308”x.045”x13c

8.   Pilot Valve (Regulated pressure supply to the SLT, SLU, S1 and S2 solenoids)

9.   Pilot Valve Spring – .985”x.337”x.045”x10c

10. Bore Plug

11. N-D Accumulator

12. N-D Accumulator Spring – 2.212”x.618”x.062”x11c

13. C2 Clutch Accumulator Inner Spring – 1.137”x.308”x.045”x13c

14. C2 Clutch Accumulator Outer Spring – 1.107”x.438”x.068”x8c

15. C2 Clutch Accumulator

16. Shift Solenoid 2 Relay Valve Spring- 1.403”x.324”x.025”x12c

17. Shift Solenoid 2 Relay Valve

18. Shift Solenoid 1 Shift Valve 1 Spring – 1.142”x.234”x.021”x.15c

19. Shift Solenoid 1 Shift Valve 1

20. C3 Clutch Accumulator Inner Spring – 1.137”x.308”x.045”x13c

21. C3 Clutch Accumulator Outer Spring – 1.107”x.438”x.068”x8c

22. C3 Clutch Accumulator

23. SLT Damper Valve Spring – .862”x.350”x.045”x9c

24. SLT Damper Valve

25. Lock-Up Control Valve

26. Lock-Up Control Regulating Valve

27. Lock-Up Control Valve Spring – .822”x.215”x.026”x12c

28. Lock-Up Control Valve Sleeve

29. Torque Converter Clutch Switch Valve

30. Torque Converter Clutch Switch Valve Spring – 1.420”x.385”x.023”x.16c

31. C2 Clutch Valve

32. C2 Clutch Valve Spring – .992″x.308″x.021″x10c

33. Clutch Relay Valve Spring – .718″x.210″x.020″x9c

34. Clutch Relay Valve

35. Torque Converter and Cooler Regulator Valve

36. Torque Converter and Cooler Regulator Valve Spring – 1.493”x.391”x.046”x13c

37. Pressure Regulator Valve

38. Pressure Regulator Valve Spring – 1.192”x.559”x.050”x6c

39. Shift Solenoid 1 Shift Valve 2 (B2-C3 Relay Valve)

40. Shift Solenoid 1 Shift Valve 2 (B2-C3 Relay Valve) Spring – 1.134”x.236”x.021”x15c

41. B2 Brake Valve (Low/Reverse Brake)

42. B2 Brake Valve (Low/Reverse Brake) Spring – 1.435”x.325”x.025”x12c

43. C1 Clutch Accumulator Inner Spring – 1.137”x.308”x.045”x13c

44. C1 Clutch Accumulator Outer Spring – 1.107”x.438”x.068”x8c

45. C1 Clutch Accumulator

46. Manual Valve – Not shown (Located in the solenoid outer valve body housing)

Note: Valve names have been identified by their generic function and are subject to a future change expressing their more specific function

Figure 7

Figure 7 Legend:

1. Cooler By-Pass Check Valve

2. Cooler By-Pass Check Valve Spring – .622″x.248″x.035″x8 coils

3. To Cooler Check Valve

4. Cooler Check Valve – .600″x.246″x.022″x12c

5. SL2 Solenoid Back Pressure Relief Valve

6. SL2 Solenoid Back Pressure Relief Valve Spring – .600″x.246″x.022″x12c

Figure 8

Figure 8 Legend:

1.   SL3 Solenoid Back Pressure Relief Valve

2.   SL3 Solenoid Back Pressure Relief Valve Spring – .600″x.246″x.022″x12c

3.   SL5 Solenoid Circuit Pre-Fill Check Valve

4.   SL5 Solenoid Back Pressure Relief Valve

5.   SL5 Solenoid Back Pressure Relief Valve Spring – .600″x.246″x.022″x12c

6.   SL4 Solenoid Back Pressure Relief Valve

7.   SL4 Solenoid Back Pressure Relief Valve Spring – .600″x.246″x.022″x12c

8.   Filter – Filters line pressure to the Pilot Valve and the Clutch Relay Valve

9.   SL1 Solenoid Back Pressure Relief Valve

10. SL1 Solenoid Back Pressure Relief Valve Spring – .600″x.246″x.022″x12c

11. B2 Brake (Low/Reverse) Check Valve

12. Reverse Engagement Check Valve

13. Reverse Engagement Check Valve Spring – .600″x.246″x.022″x12c

14. Line Pressure Relief Valve

15. Line Pressure Relief Valve Spring – .438″x.369″x.050″x4c

16. Manual Valve Check Valve

17. N-D Pre-Fill Check Valve

Figure 9

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