Upgrading the Cummins Roller Clutch
When the Cummins diesel was offered in 1989 Dodge pickups, it could be purchased with either a manual transmission or a non-lockup 727 automatic transmission. The converter for the non-lockup 727 transmission was very similar to the 400 or AT540 converters and had many internal likenesses. The converter’s historic durability made it a good choice for this demanding application, but this converter also has some historic shortcomings.
A Keen Perception of the Obvious
A no-move 1992 Mazda MPV van was towed into a shop, where it was determined that the planets inside the R4A-EL transmission were toasted. One look at the vehicle and you can see why (see Figure 1). This van recently had been involved in a front-end collision that collapsed the oil-cooler line, causing a lack of cooler flow, and there ya go – wasted planets.
February 2006 Issue
In This Issue
Chrysler Transmissions: Consistency in Electrical Diagnosis Since 1989 – Part 2
Dodge/Jeep Trucks with 45RFE/545RFE Transmissions: Harsh Shifts
January 2006 Issue
In This Issue
Chrysler Transmissions: Consistency in Electrical Diagnosis Since 1989
German Electrical Insanity
For those select few of you who have taken on the task of either rebuilding or installing a Volkswagen 01M transmission, you know that these units can be difficult. This transmission is very easy to rebuild, and usually the internal parts are in good shape.
Beginning Again – Happy New Year
2005 is now in the history books, and I hope all of our readers enjoyed the holidays. It is a time-worn habit to make resolutions and try to improve our situations for the new year.
Time is a human creation. All other forms of life and some primitive tribes do not have any understanding of time. They are driven by instinct, seasonal changes and their life cycles, but we are the only species that has created the concept of time. This ability to measure each day precisely and then make future plans is a blessing and, at the same time, the source of tremendous pressure, which is self-induced.
Making a Case for Technical Training
The more training technicians receive and can understand and apply, the more efficient they will be. And that translates to money.
RL4FO2A/RE4FO2A: Mysterious Axle-Seal Leak
A 1993 Nissan Maxima was brought to a transmission shop. The customer complained about a persistent transmission leak that was leaving a spot on his garage floor and said the transmission had been rebuilt about a year earlier. He added that the vehicle was returned to the original shop within the first month to have the passenger-side axle seal replaced. Since the axle-seal replacement did not eliminate the leak, the vehicle was taken to a general-repair shop, which replaced the axle seal and installed another axle under warranty. The customer said that each time the vehicle was worked on, the leak seemed to stop for about a month, then reappear.
TCC Apply Piston & Cover Deflection
A 604 transmission with a 740 code led to many different approaches and attempts to troubleshoot the underlying problem. As the possible causes were narrowed down, the focus began to turn toward the converter. Replacing the converter with a factory unit eliminated the 740 code, and since the code would show up on any road test, this seemed like the perfect vehicle to identify the root cause.
Getting VTi Leverage
This transaxle has a bi-directional ratio-control motor (RCM) on top of the valve body (see Figure 1). The RCM indexes with a lever attached to the variable-ratio-control valve in the valve body, as Figure 2 shows. The opposite end of this lever sits inside a pocket of a device called the drive-pulley follower, as shown in Figure 3 from the valve-body case side with the valve body removed.
