4T65-E All-Wheel-Drive: Noise and Gear Failures
The 4T65-E was introduced in 1997 in several vehicles equipped with the supercharged 3.8-liter engine, and some non-supercharged 3.4- and 3.8-liter engines. It was considered to be the big brother to the 4T60-E transaxle.
Taking the Guesswork Out of Parting
Note: This article, the second in a two-part series on proper parting procedures, takes a look at a better method.
A Primer on Proper Parting Procedures
When the first automatic transmissions were introduced in the late 1930s, the fluid coupling was routinely serviced as part of a transmission overhaul. The fluid coupling was bolted together, and servicing it didn’t require any skills that a regular mechanic wouldn’t have. When the fluid coupling evolved into the torque converter, it was still a bolt-together unit, and the only new challenge for the mechanic was to learn about stators.
740/1740 Codes and Chrysler Converter Flow
740/1740 codes tell you there is excessive slip at the TCC clutch. The engine and transmission output speeds are constantly being monitored. You can compare the difference in the two speed rates to determine transmission slip. If the RPM parameters for a slip in a given gear are met and TCC apply has not been commanded, you will see a gear-ratio code. But, if the RPM parameters for a slip in a given gear are met and TCC apply has been commanded, you will see a (TCC slip) 740 code.
Mercedes 722.3 Quickie Stator Repair
What happens is this: You’re assembling the 722.3 transmission and find that spalling has occurred on the bearing surface at the rear of the support (see Figure 1). The pitted area, caused by the spalling, was missed during disassembly and cleanup, and now it’s your problem.
The GM 298mm Converter
You’ll hear some convincing arguments about how the selective (conical) plastic thrust spacer is used to adjust the stack height on the GM 298mm torque converter. You also will hear some convincing arguments about how this same selective thrust spacer is used to adjust the clutch-release clearance on the GM 298mm converter. The truth is that both statements are correct. The selective (conical) plastic thrust spacer may be used to adjust both the stack height and clutch-release clearance on this converter. What is important is to be aware that changing the adjustment of one also changes the other. As long as you know the proper parameters and parameter limits of both measurements, you can adjust both successfully.
12-Valve Cummins Diesel/618 Transmission
A 1994 Dodge R2500 pickup was brought to a transmission shop. The customer complaint was no overdrive when cold and that as the vehicle got up to operating temperature the overdrive would engage but would go in and out with throttle opening.
A Case of Mistaken Identity, Part 2: Impossible?
It is important that you identify the problem immediately. Do not road-test the vehicle to check out the forward speeds if you are having a problem with reverse. The reduction band must be anchored to the case by the anchor stud to prevent rotation. If you try to drive the vehicle without the stud in place, the band will rotate, wedging itself between the drum and case. This will prevent the drum from rotating and will burn the clutches that try to apply for a given gear. If the clutches lose their service ability, then the transmission must be removed.
4L30-E: Slips in 2nd or Slips in 3rd
A 1995 BMW 325i equipped with a 4L30-E transmission came into a transmission shop. The customer was referred to the transmission shop by a technician at a general service facility because of a “check transmission” light and the torque-converter-slip code that he found during his inspection.
Subarus Have Their Own Set of Problems
The four-speed automatic Subaru is a first cousin to the RE4RO1A, RE4RO3A and JR403, but the Subaru version of this transmission has not been plagued by the converter-clutch problems that have afflicted other members of its family. The Subaru was the only one to offer an all-wheel-drive option, which has allowed it to have its own set of problems.
4T65-E’s and the Mysterious Code P0730
A 2001 Buick Century Custom came to a transmission shop with a complaint of jerky shifts. A road test of the vehicle showed that all shifts were harsh, and a scan check registered the generic gear-ratio-error code P0730. Since code P0730 does not illuminate the malfunction-indicator light, the harsh shift was the customer’s only clue that anything was wrong.
Miracles Do Happen
A 1995 Jeep Grand Cherokee was brought to a Cottman Transmission shop in Jennings, Mo. The customer‘s complaints were typical for this model transmission and correct for the mileage of the vehicle. A complete transmission and converter rebuild were sold and, because of the chronic cooler-line problems, a cooler-line update was sold for added security.
