A/T - 700R4 Improved Shift Feel/Reverse
SIL 88-4 (Jan)SUBJECT: 700 R4
PRODUCTION CHANGE:
PARTS INVOLVED:
1. REVERSE INPUT HOUSING AND DRUM ASSEMBLY
2. LO AND REVERSE CLUTCH ASSEMBLY
3. FORWARD CLUTCH BACKING PLATE
4. 3-4 CLUTCH APPLY PACKAGE
Changes to the 1987 THM 700 R4 transmission to improve shift feel when REVERSE is selected from any gear range, and other new parts in the forward and 3-4 clutch assemblies.
DATE OF PRODUCTION CHANGE: (Figure 1)
Starting February 9, 1987 (Julian Date 040) all 1987 THM 700 R4 production and Service Replacement Transmission Assembly (SRTA) models were built with new parts in the Reverse, Lo and Reverse, Forward and 3-4 Clutch Assemblies.
SUBJECT:
New Reverse Input Housing & Drum Assembly
TRANSMISSION MODELS:
All Models
Change to Assembly Components: (Figures 2 and 3)
New reverse input housing and drum assembly (605) is revised as follows:
- Smaller (round versus rectangular) feed hole in hub is 2.413 mm (.095"); was 3.85 x 5.0 mm ( .51 x . 19711)
- Longer inner housing splines
- Check valve retainer and ball assembly removed
- New cast aluminum reverse input clutch piston (607) with 2.057 mm (.081") orifice
- Reverse input clutch waved plate (611) replaced by a "belleville" plate
- Thinner reverse input clutch fiber plates (612) thickness now is 1.73 - 1.88 mm (.068 - .074); was 1.93 - 2.13 mm (.076 - .084")
- Selective reverse input clutch backing plate (613)
New oil pump cover assembly changed as follows: (Figure 4)
Larger diameter reverse input feed hole in stator hub
SERVICE ACTION:
These parts can not be used with parts from transmissions built prior to February 9, 1987 (Julian Date 040).
SERVICE PARTS INFORMATION:
PART NUMBER DESCRIPTION
8663068 Reverse Input Clutch Housing and Drum Assembly, Complete
8663071 Reverse Input Clutch Piston
8657922 Reverse Input Clutch Seal Package
8663079 Reverse Input Clutch Plate Assembly Pump Cover Assembly
Backing Plate-Reverse Input Clutch
8663075 Identification 5 - Figure 6
8663076 Identification 6 - Figure 6
8663077 Identification 7 - Figure 6
8663078 Identification 8 - Figure 6
REVERSE INPUT CLUTCH BACKING PLATE SELECTION PROCEDURE (Figures 5 & 6)
1. With the reverse input clutch fully assembled, apply an evenly distributed load to the clutch pack in the direction and diameter as shown in figure (5). Medium pressure (approx. 20 lbs.) on the backing plate applied by fingers on five evenly distributed points will obtain the backing plate travel for measurement. (Caution: excessive pressure will distort the "belleville" plate resulting in an inaccurate measurement.)
2. Using a feeler gage, measure between the snap ring and the backing plate. Backing plate travel should be 1.02 mm - 1.90 mm (.040" - .075")
3. Select the proper backing plate to obtain the specified travel (Figure 6)