Tweaking the GM 298mm converter

You’ll hear some very convincing arguments about how the selective (conical) plastic thrust spacer is used to adjust the stack height on the GM 298mm torque converter. You will also hear some very convincing arguments about how this same selective thrust spacer is used to adjust the clutch release clearance on the GM 298mm torque converter. The truth is that both statements are correct. The selective (conical) plastic thrust spacer may be used to adjust both the stack height and clutch release clearance on the 298 converter. What is important is that you are aware that making a change to one adjustment also changes the other. As long as you are aware of the proper parameters and the parameter limits of both measurements, you can make successful adjustments to both. The selective (conical) plastic thrust spacer fills the void between the cover and the turbine hub. Spacers are made in six different thicknesses, numbered 2 through 7 (see Figure 1). They vary in thickness between 14.6mm (.575″) and 16.8mm (.661″).

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Article No.: TCTIP-08-05
Author: Ed Lee
Total Pages: 2

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