M/T - Noise and High Effort During Shifting
Number: 86-95Section: 7B
Date: JULY, 1986
Subject: NOISE AND HIGH EFFORT DURING SHIFTING
Model and Year: 1985-86 SPRINT MANUAL TRANSMISSION
TO: ALL CHEVROLET DEALERS
Some of the subject vehicles may exhibit conditions of high effort and/or gear clash noise during some shifting maneuvers. This condition may be more prevalent during cold weather (below freezing) and also when shifting during initial vehicle warm-up periods.
During 1986 model year, the factory fill for transmission lubricant was changed from 80 W/90 to 75W. This change was made in conjunction with internal component changes described below.
Vehicles built prior to GK719594 (2 door) and GK817385 (4 door) were filled with 80 W/90 oil and should be serviced with the same oil, unless steps 1-3 are performed.
Vehicles beginning with the above VIN serial numbers were factory-filled with 75W transmission oil. When servicing these vehicles 75W or SAE 5W-30 engine oil must be used.
Vehicles built from VIN's GK 721183 (2 door) and GK 818780 (4 door) onward incorporate other revisions which are designed to minimize the described conditions. At ambient temperatures below 0 degrees fahrenheit, some vehicles may still exhibit the described corditions to a lesser degree.
Corrective action for vehicles with these conditions that were built prior to the breakpoint VIN's previously listed are as described in Steps 1-5:
1. Replace ring 2nd/3rd gears - Use P/N 96055142 (2 pcs.).
2. Replace gear-countershaft-2nd gear - Use P/N 96055162 (1 pc.).