A/T - A500/A518 No 4th Gear
TECHNICAL BULLETIN # 104TRANSMISSION: A-5OO/A-518
SUBJECT: No 4th Gear
APPLICATION: Chrysler
N0 4th gear in an A-500/A-518 may be caused by improper snap ring installation. If either the "flat" snap ring or "waved" snap ring is installed in front (on top) of the overdrive clutch pack the overdrive piston will bottom on the snap ring, instead of applying the overdrive clutches.
Refer to the following figures for proper assembly.
1. Install flat snap ring first.
2. Install the waved snap ring on top of the flat ring in the same groove. Figure 1.
3. Install the overdrive clutch pack. Make sure to install the thin backing plate first, and the thick backing plate last. Figure 2.
4. Install the "wire" snap ring on top of the overdrive clutch pack. Figure 3.
5. Make sure to measure for proper thrust plate selection. See ATRA bulletin # 081.