A/T - 3-2 Tip-In Flare/Slip-Bump Condition
91olds03
NUMBER: 91-T-66
CORP.REF.NO: 177102R
DATE: February 1991
SECTION: 7A, 4T60
SUBJECT: 3-2 TIP-IN FLARE/SUP-BUMP AT 18-24 MPH INSTALL NEW PARTS
MODELS/YEARS: 1989-1991 CUTLASS CIERA AND CUTLASS SUPREME EQUIPPED WITH A 2.8L (VIN W) OR 3.1L (VIN T) ENGINE AND A HYDRA-MATIC 4T60 TRANSAXLE (RPO ME9)
Some 1989 through 1991 Cutlass Cieras or Cutlass Supremes equipped with a 2.8L (VIN W) or 3.1L (VIN T) engine and a HYDRA-MATIC 4T60 transaxle may exhibit a 3-2 light throttle tip-in flare/slipbump condition at 18-24 MPH. A new 3-2 line control system and spacer plate are now available that will better control the transaxle operation. These conditions can be corrected by replacing the components listed under "Service Procedure".
Figure 1 - New 3-2 Line Control System:
SERVICE PROCEDURE:
To repair a 3-2 light throttle tip-in flare/slip-bump condition at 18-24 mph, first verify the vacuum modulator line does not have a plugged orifice. Then order and install the parts for the appropriate model listed under "SERVICE PARTS INFORMATION".
IMPORTANT: Do not interchange parts between the two different 3-2 line control systems located in the channel plate assembly (Figure 1) or the following two misbuilds could occur:
1. All upshifts at the minimum shift speed (early) for any throttle position. This would be caused by the 3-2 line control valves {both primary (431) and secondary (436)} being used with the spacer plate assembly for the plug line control valve (430); the valves will not work correctly because there are no fluid passage holes in the spacer plate assembly designed to function wfth the plug valve.
2. All 2-3 upshifts at minimum shift speed (early) for any throttle position. This would be caused by using the 3-2 line control plug (430) with the new spacer plate assembly designed to function with the 3-2 line control valves {both primary (431) and secondary (436)}.
DATE OF PRODUCTION CHANGE:
The new 3-2 line control system and spacer plate were implemented into production starting December 13, 1990 (Julian Date 347). SERVICE PARTS INFORMATION:
Note: All four packages listed below contain a spacer plate. In the cases where two packages are to be used, only the spacer plate from either 8675992 or 8675993 should be used as indicated. Do not use the spacer plate from 8662992 or 8662993.
-CHART "A" -
For CHH, CJH, YKH, or YLH model transaxles built
BEFORE March 27, 1989 (Julian Date 086)
CHH and YKH Use ALL parts in Use All parts in
before 086 8662992 EXCEPT plus 8675992 INCLUDING
the spacer plate the spacer plate
CJH and YLH Use ALL parts in Use all parts in
before 086 8662993 EXCEPT plus 8675993 INCLUDING
the spacer plate the spacer plate
Models built ON or AFTER March 27, 1989 (Julian Date 086) will require all parts included in the package Indicated below:
-CHART "B" -
For transaxles built on or after
March 27, 1989 (Julian Date 086)
CHH YDH YKH Use all parts in
LMH YSH 8675992 INCLUDING
the spacer plate
CJH YHH YLH Use all parts in
LNH YTH 8675993 INCLUDING
the spacer plate
Listed below are the contents of the 3-2 Slip-Bump kits 8675992 and 8675993.
Services
Part These Content
Number Models Description
8675992 CHH Package, 3-2 Slip-Bump Kit
YDH - Instruction Sheet
YKH - Valve, 3-2 Line Control Valve Primary (431)
LMH - Valve, 3-2 Line Control Valve Secondary (436)
YSH - Retainer, 3-2 Line Control (435)
- Spring, 3-2 Line Control (432)
- Plate, Valve Body Spacer (31)
8675993 CJH Package, 3-2 Slip-Bump Kit
YHH - Instruction Sheet
YLH - Valve, 3-2 Line Control Valve Primary (431)
LNH - Valve, 3-2 Line Control Valve Secondary (436)
YTH - Retainer, 3-2 Line Control (435)
- Spring, 3-2 Line Control (432)
- Plate, Valve Body Spacer (31)
A list of the contents of 8662992 and 8662993 can be found in Dealer Technical Bulletin 89-T-118.
Parts are currently available from GMSPO.