Meet the 68RFE

Figure 4

lubrication and cooler circuits assure ample pressure for normal transmission operation even if the cooler is obstruct- ed or the fluid flow is restricted due to extremely low temperatures. The hydraulic control system design

(without electronic assist) provides the transmission with park, reverse, neu- tral, and fourth gears, based solely on driver shift lever selection. This design allows the vehicle to be driven in limp-in mode in case of an electronic control system failure, or a situation the Transmission Control Module (TCM) considers potentially damaging to the transmission. The 68RFE has a design change

that allows for fulltime 6-speed and increased torque ratios (figure 1). The 4C on the 45/545RFE held the annulus as the planet was driven by the sun gear. On the 68RFE the 4C holds the sun gear, causing the planetary to drive the annulus. * When output speed is greater

45/545RFE and 4th gear on the 68RFE. Vehicles that have Electronic Range Select (ERS) won’t have a manual low 2nd gear while in failsafe.

Fluid Level

The fluid level for this unit depends

on fluid temperature. Proper fill requires

GEARS May/June 2010

Figure 5

5

than 150 rpm the L/R clutch is released and the ORC is the holding element before the 1-2 shift. ** Failsafe is 3rd gear on the

using a scan tool to verify actual trans- mission temperature (figure 2). To avoid overfilling the transmis-

sion, always follow this procedure for checking the fluid level: 1. Remove dipstick and insert a clean funnel in transmission fill tube.

2. Add this initial quantity of Mopar® ATF +4 to the transmission: a.

If you only changed the fluid and filter, add 5 quarts of ATF +4 to transmission.

b. If you rebuilt the transmis- sion and replaced or drained Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60  |  Page 61  |  Page 62  |  Page 63  |  Page 64  |  Page 65  |  Page 66  |  Page 67  |  Page 68  |  Page 69  |  Page 70  |  Page 71  |  Page 72  |  Page 73  |  Page 74  |  Page 75  |  Page 76  |  Page 77  |  Page 78  |  Page 79  |  Page 80  |  Page 81  |  Page 82  |  Page 83  |  Page 84  |  Page 85  |  Page 86  |  Page 87  |  Page 88  |  Page 89  |  Page 90  |  Page 91  |  Page 92