GM 5L40-E, 5L50-E
A low vacuum reading indicates wear. For speci!c vacuum test parameters, refer to additional information available at www.sonnax.com.
TASC Force Tips: ZF6HP19/26/32
In-depth instructions for checking the serviceability of valve bodies.
Properly Diagnose a 722.6 Shudder in Vehicles with MDS System Engines
A 2007 Dodge Charger equipped with a 5.7L V8 engine and 722.6 transmission was brought to a transmission shop. At the time of the visit, the vehicle had more than 88,000 miles on the odometer. The customer told the service writer that the vehicle had previously been to four different repair shops in a failed attempt to eliminate a downshift shudder and cold-stall condition. A technician road-tested the vehicle and described the condition as a vibration when coming to a stop and — since it was February in the Northeast — the cold-stall condition also was quickly verified.
‘Tween’: How to Identify ZF6HP Series Valve Body that Bridges 1st & 2nd Generation Designs
Take a ride on the memory train back to middle school. For many, this arouses feelings of a socially awkward time due to things like orthodontic braces and physical changes driven by hormones and runaway metabolism. Left behind were the childish days of elementary school, yet the yellow bus ride in the morning and afternoon signified that you hadn’t yet reached those glorious teenage years, high school and wheels of your own. By today’s popular definition, you were a “tween.”
All in the Family
You may have noticed some similarities over the years in regard to a family of Chrysler transmissions that began with the Ultradrive 4-speed automatic in 1989. In its day it was fairly innovative, featuring clutch-to-clutch operation (no bands) and adaptive shift technology. Over time, the basic structure has developed into a variety of different models, some with 5- and 6-speed variations.
Beyond the Pressure Regulator: Keeping Cool While Investigating Mystery Honda Overheat
Most transmission technicians are aware of the notorious loss of proper converter feed that plagues various Honda transaxles. For those who are less familiar, converter charge oil is cut because there is not enough pump output to keep the pressure regulator valve in the regulating position, allowing the TCC to drag and eventually disintegrating the lining. Many technicians have already learned the importance of installing a modified pressure regulator valve during overhaul that ensures converter charge pressure is available at all times, regardless of pressure regulator valve position.
Six Ways from Sunday: Diagnosing ZF6 & Ford 6R60/80 TC-Related Drivability Concerns
Recently, TV picture troubles caused us to summon a repair technician to our home. The technician (we’ll call him Tech No. 1) snapped on his tool belt and started disassembling components as soon as he arrived. He checked over the satellite dish, then he continued the assault on the house by removing rows of ceiling tile for an in-depth inspection. After hand-checking all the connections, an hour into his service call, he condemned the satellite receiver. A couple days later the suspect receiver was replaced, but the intermittent screen-digitization problem remained.
Too Close For Comfort: Pinpointing 4L60E Gear Train Assembly Problems
Let’s take a look at a common 4L60/65/70E scenario. During assembly of the transmission, the technician has difficulty installing the output shaft snap ring (Figure 1), or while checking the input shaft endplay finds that it is too tight or too loose (spec is 0.005″ to 0 .035″). The technician tears the unit back down to inspect for an (assumed) assembly problem, but cannot seem to figure out why the stack-up is not working.
Diagnosing A750E/F 2-3 Flare After Overhaul
Diagnosing shift quality concerns can be difficult, especially after rebuilding the transmission. You have just invested parts, your time and expertise into repairing the transmission. You are emotionally invested, which sometimes makes it hard to think clearly. This can be the case when you have a Toyota/Lexus A750E or A750F that has a 2-3 flare after overhaul.
Playing with Transmissions
Tech-support hotlines have been burning up for years with phone calls concerning rapid gear-train failure in GM TH400 transmissions after routine rebuild or repair. It’s time to address the issues that cause this and reverse widespread confusion surrounding gear-train setup on this and similar units. Today we will clear up the mystery in setting proper endplay for this transmission. If tolerances are not set correctly, costly comebacks can result.
Understanding these basic checks on the 400 will give you back-ground knowledge in setting build procedures that will be used with similar gear sets, such as 4L80-E.
Lay It on the Line: Guard against comebacks with easy driveline inspection techniques
In the transmission business, overlooked driveline problems are a cause of comebacks that are not related to your build but can still hurt a shop’s reputation. Making some basic checks of the vehicle while it’s still in the shop can get ahead of many driveline-related issues and help reduce comebacks.
Dodge 48RE Hydraulic Features Revealed
Dodge 48RE Hydraulic Features Revealed
TASC Force Tips
Author: Jim Dial
Units: 48RE vs. 46/47RE valve bodies
Issue: Differences in pressure curve & TCC clamping
