Thread: Tranny slip.?.?
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Old Fri, February 12th, 2010, 12:55 PM
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For a visual person such as myself...


Engine --> [Converter] --> Input Shaft --> [Tranmission] --> Output Shaft

or more specifically...

Engine --> Input Shaft --> Output Shaft

Engine --> Input Shaft:
  • Same if Converter is locked
  • Different if Converter is unlocked (difference varies depending on load)
Input Shaft --> Output Shaft (Based on 4R75 Transmission)
  • 1st gear - Input is 2.8387 x Output (2.8387:1)
  • 2nd gear - Input is 1.5545 x Output (1.5545:1)
  • 3rd gear - Input is the same as Output (1.0000:1)
  • 4th gear - Input is 0.6984 x Output (0.9084:1)
Slip in the transmission can be easily calculated by finding the input:output ratio and see if it matches the current ratio for the selected gear. If it doesn't match, then slip is present.

Slip in the converter is only determined during lockup.
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