A/T - 700R4 New Front Pump Assembly
SIL 85-37SUBJECT: 700 R4 PUMP
Beginning on March 4, 1985, or Julian Date 064, (refer to Figure 1) a new pump assembly went into production for 1985 THM 700-R4 "YA", "YC" and "YZ" model transmissions.
This new pump assembly uses an inner slide spring and an outer slide spring (refer to items 243 and 209 of Figure 2) or nested slide springs, that lowers the wide open throttle 3-4 upshift
To update pump assemblies used in 1985 THM 700-R4 "YA", "YC" or "YZ" model transmissions built prior to Julian Date 064, the following springs may be ordered from W.D.D.G.M.:
8639562 - Inner Pump Slide Spring
8639563 - Outer Pump Slide Spring
Use procedures contained in the appropriate Service Information Manual and the illustration provided in Figure 2.