GM 4L65E: The Purpose of Omitting the #5 Ball

GM 4L65E: The Purpose of Omitting the #5 Ball

Wayne Colonna describes a 4L65E with a modified valve body spacer plate where the #5 checkball was left out.

CHANGE:

The #5 checkball was eliminated and the valve body spacer plate was modified. The manual gear selector and its components have also been modified and paddle shifters have been added to provide manual up and down shift capabilities when the selector is in the “S” position. The shift indicator quadrant without the #5 checkball will have PRNDS. The shift indicator quadrant for the conventional shift pattern is PRND321.

REASON:

With the PRND321 quadrant indicator and with the selector lever placed into the D3 position, the overrun clutch will not apply until the transmission shifts to third gear. When equipped with the PRNDS quadrant indicator, the changes in the spacer plate and the elimination of the #5 checkball will now allow the overrun clutch to apply in first, second and third gears. This not only allows engine braking on coast downshifts.

PARTS AFFECTED

  1. The valve body spacer plate.
  2. The shift selector assembly and its related components.

INTERCHANGEABILITY

None of the manual shift capable parts can interchange with conventional shift system parts.

SERVICE INFORMATION

Figure 1 Is the spacer plate and Valve body checkball locations for the Non-M Shift Corvette.

Figure 1

Figure 2 is the spacer plate used in the Corvette with the Manual Paddle Shift package. Using GM’s Tech Guide numbering, hole 38c was blocked, hole 35c/39 was blocked, the #5 ball is removed, and hole 35a was relocated. These changes blocked the D2 circuit to the 2-3 shift valve and the #5 check ball (38c).

Figure 2

It connected Overrun Clutch feed to the D3 circuit (35a), which was routed through the revised #5 check ball circuit. With the ball eliminated and the D2 hole blocked (35c/39), it forces the Overrun Clutch feed to be metered past the #6 ball passing through the 4-3 sequence valve to apply the clutch. This configuration allows for D3 oil to immediately charge the Overrun Clutch circuit when the M range is selected by the driver for 1st, 2nd and 3rd gears. When a shift into 4th occurs,  Overrun Clutch pressure is exhausted at the 4-3 sequence valve.

See Figure 3 to compare the familiar non-M style hydraulics to the new M design seen in Figure 4.

Figure 3
Figure 4

See figures 5-8 to see all four gears in the M position (Paddle Shift).

Figure 5
Figure 6
Figure 7
Figure 8

You May Also Like

Comparing the pumps on Ford 6F35 generation 1 and 2

The change For the 2013 model year, the Ford 6F35 transmission received a high-volume pump which increased the intake channel in the stator shaft support from 0.432” to 0.520”. The pump body intake channel was also increased to the same matching dimensions. The reason Higher pump volume was required to accommodate the 1.5-, 1.6- and

The change

For the 2013 model year, the Ford 6F35 transmission received a high-volume pump which increased the intake channel in the stator shaft support from 0.432” to 0.520”. The pump body intake channel was also increased to the same matching dimensions.

The reason

Higher pump volume was required to accommodate the 1.5-, 1.6- and 2.0-liter turbocharged engines. Parts affected include the stator shaft support and the pump body.

What to do when a GM 6T40 BAS Hybrid loses line pressure

The complaint After overhaul, a GM vehicle equipped with the 6T40 BAS Hybrid transmission has a complaint of little or no movement. A line pressure check reveals extremely low pressure. The technician disconnected the transmission case connector to see what effect that would have on line pressure, but it was negligible. Related Articles – BendPak

Keep an eye out for 6L80/90 defective oil pumps

The complaint After replacing the pump assembly in a 6L80/90 transmission with a new GM pump the vehicle returns with symptoms that would appear to be caused by a low fluid condition: it falls out of gear at a stop and has low line pressure. Upon further inspection the sump filter, which was also a

Avoiding 4L60-E harsh shifts and engagements

The complaint The complaints are harsh engagements and shifts. The scan tool data reveals that there is no amperage command to the EPC solenoid therefor the line pressure is at maximum. There are no transmission codes stored, there are lean codes stored in the ECM. The ABS or the VSC (vehicle stability control) lights may

Fixing 4L60-E 1-2 shift issues

The complaint A 1993 Chevrolet 1500 with the 5.0-liter engine and 4L60E transmission has a complaint of second gear starts. The truck seemed to start off in first gear on an initial cold start but would stay in second gear at a stop or even when shifted out of Drive to Park or Reverse and

Tech-Talk-Figure-2-600

Other Posts

Sonnax introduces 4L60-E, 4L65-E heavy-duty remanufactured valve bodies

Sonnax highlights its heavy-duty remanufactured valve bodies for ’96–’08 GM 4L60-E/65-E transmissions. Two part numbers are offered: GM053-HD, which the company says offers improved sprag/clutch durability in D3 first and second gears; or GM054-HD (pictured above), which adds overrun clutch control to those gears plus D4 first, second and third, the company says. Related Articles

Sonnax-GM054-HD-600
Ford 6R60/6R80 Erratic Temperature Operation

The Complaint A 2013 Ford F-150 equipped with the 6R80 Transmission was overhauled and reinstalled back into the vehicle. On the initial road test, the “trans temp” lamp came on. The truck was equipped with a dash-mounted monitor which was set to engine RPM, vehicle speed, engine coolant temperature and transmission temperature. While driving, the

F150-Figure-1
Ford 6R60/6R80 Direct Clutch Drum Assembly

The Complaint When rebuilding a Ford 6R60 or 6R80 transmission, the builder is confused by some published material which may show rebuild procedures on one but not the other. The confusion happens when rebuilding the direct drum due to this conflicting information. Related Articles – Sponsored video: GM 6L80 Random Shift Issues – Honda CR-V

6R60-80-Figure-1
Ford 6R60/6R80 Overdrive Drum and Front Planet Compatibility

The Complaint Soon after overhaul, a Ford 6R60/6R80 Transmission starts to develop a variety of operational issues. A pan drop reveals metal shavings suspended in the fluid. Upon disassembly of the transmission, the overdrive drum and the forward planet exhibit damage to their mating surfaces. Related Articles – KIA A6MF2H Hybrid Engine Stalls in Drive

Ford-6R60-Figure-5