K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
A.
Use a micrometer to measure the original pump rotor and slide thickness accurately (Figure 3). To obtain the most accurate reading,
measure on flat undamaged surfaces. The oil pump rotor and slides for the THM 200-4R and the THM 700-R4 transmissions are the same.
B.
Using the original part measurement, order replacement parts according to the selective charts.
Note
The replacement part will provide the same clearance that the oil pump assembly was originally built with. The proper end clearance specification is
0.020 to 0.050 mm. or (.0008") to (.002") for the 200-4R and the 700-R4.
C.
Hone both sides of the replacement rotor and slide to remove any burrs, and measure the replacement parts with a micrometer to assure
proper selection.
Note
Incorrect rotor selection could result in a damaged oil pump assembly, and/or low oil pressure. Incorrect slide selection could result in incorrect line
pressure.
