Yugo Workshop Manuals
Yugo L4-1300cc 1.3L (1991)
Transmission and Drivetrain > Automatic Transmission/Transaxle > Component Information > Technical Service Bulletins > Technical Service Bulletins for Automatic Transmission/Transaxle: > ATRATB8930 > Oct > 89 > A/T - Math Part II > Page 772
EXAMPLE: 34 + 20 divided by 34 = 1.58 This is now 2nd gear on a THM 350 is calculated. (See figure)
FOR OVERDRIVE, the sum of the ring gear + Sun gear is used for the input tooth count.
So, IF THE SUN GEAR IS HELD, then the ring gear divided by (ring gear + Sun gear) = Ratio
EXAMPLE: 34 divided by (34 + 20) = .63:1 Look familiar?
The A4LD, the THM 200-4R, the A-140E, the A-40D, the THM 325-4L are some of the units that use this method of getting overdrive. (See figure)
If the ring gear is held, then the Sun gear divided by (ring gear = Sun gear) = Ratio
EXAMPLE: 20 divided by (34 + 20) = .37:1 (See figure)
REVERSE IS THE EASIEST - THE PLANET IS HELD.
The Sun gear is the input, and the ring gear is the output. The formula for this is: The ring gear divided by the Sun gear = Ratio.
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