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E9 4 Ever wrote:

2120 12 speed some with a shift lever for the low hole and some with a air shift on the low hole.

The Mack 12 speed is not a T200 series transmission. It is a TR 107 series transmission.

I believe the designation was TRTXL107 for the older type with 2 sticks and TRTXL1070B for the later model with the air shift lo hole.

I am not aware that Mack has ever produced a "T2120"

"If You Can't Shift It Smoothly, You Shouldn't Be Driving It"

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