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.
46-47RH/RE Cooler and Converter Flow
The image of a target is often used in education or training. The bulls-eye is the topic of most importance. It’s what you “Need to Know,” with each consecutive ring or “Nice to Know” reinforcing or providing that information.
December 2005 Issue
Issue Summary:
The RE4RO1A underwent significant changes in many of the internal parts beginning with the 2001 model year.
A Toyota/Lexus vehicle may exhibit shift-feel and drivability complaints after the transmission has been overhauled or replaced.
Failure of the E-clutch piston in ZF 5HP24 (A5S 440Z) transmissions can cause flared 1-2 and 2-3 shifts.
ZF Industries now offers a valve-body reconditioning kit for the ZF 5HP24.
Rebuilding the Unrebuildable?
Today’s torque-converter rebuilders face increasingly complex rebuilding jobs. Perhaps no other torque converter has put rebuilders to the test more than some of the ZF 5HP-style converters. These torque converters are manufactured with what is described as a “captive clutch” and would normally be considered a non-serviceable item.
Why Didn’t I Think of That?
Once in a great while something comes along that makes you slap yourself on the forehead (ala Homer Simpson) and wonder why you didn’t think of that. The Teslite (teslite.com) test lead is one of those items – a very simple tool that can find a bad connection or contact with a quick push of a button.
The Tremec T56 Six-Speed: Revolution and Evolution
Tremec, also known as Transmission Technology Corp., is a major producer of manual-transmission and drivetrain components. Tremec operates a world-class plant that is producing transmission products for many of the world’s major auto and truck manufacturers.
One for the ‘Arc-ives’
Finding the cause of an electrical problem on a Ford Expedition requires some detective work
A 2002 Ford Expedition equipped with a 4.6-liter V-8 and 4R70W transmission came into the shop with a host of solenoid electrical codes.
Leftover O-Rings
Have you ever wondered where those extra O-rings go that are left over in the kit bag after you’ve completed an overhaul on a transmission? Most rebuilders, including myself, will twist-tie them to a bellhousing bolt hole and say, “Must be some spare pieces for the R&R guy!”
The Future for Manual Transmissions
When I speak of manual- (standard) transmission work, the category actually will include more than transmissions. This umbrella includes other driveline services: all types of transfer cases, differentials, and associated parts such as drive shafts, U-joints, and tires. The mix of transmissions in the marketplace is about 20% manual and 80% automatic.
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.
November 2005 Issue
Issue Summary:
Beginning at the start of production for the 1999 model year, the planetary pinions on both carriers in THM 4L80-E transmissions were produced 10%thicker than those in previous models.
In a 1999 Chevy truck with a 6.5-liter diesel engine and 4L80-E transmission, the optical/fuel-temperature sensor was responsible for a complaint of 2-3/3-2 and 3-4/4-3 shift shuttles at cruising speed with 25%or greater throttle opening.
