Wayne Colonna, Author at Transmission Digest - Page 6 of 29
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Fixing 4L60-E 1-2 shift issues

The complaint A 1993 Chevrolet 1500 with the 5.0-liter engine and 4L60E transmission has a complaint of second gear starts. The truck seemed to start off in first gear on an initial cold start but would stay in second gear at a stop or even when shifted out of Drive to Park or Reverse and

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A misleading code: Finding the right solution to the right problem

In having the privilege of presenting at Worldpac’s Supplier and Training Expo in Orlando Florida earlier this year, I met a couple of instructors from the Daytona State College who attended my seminar: Beau Bosman and Casey Knecht. During my presentation, I covered an issue with an Allison 1000/2000 that had the converter clutch cycling

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Transmission programming modules: When to reprogram and when to replace

Programming modules have been an essential aspect of the complete repair and service experience (Figure 1) within the automotive industry for quite some time now. Not providing this service shortchanges both the shop and the customer; yes, the repair has been performed, but the vehicle is still not working as well as it could be.

Technically Speaking June
10R80 gear ratio errors after rebuild

A 2018 F-150 Raptor using a 3.5L EcoBoost in front of a 10R80 transmission developed a noise at the rear of the transmission. The shop eventually diagnosed this as a rear case needle bearing failure. When road tested after repairs, the computer detected gear ratio errors immediately. This took the shop through a time-consuming process before

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A Chevy Volt making noise

There is a Preliminary Information (PI) paper published by GM regarding a concern with 2011 to 2013 Chevy Volt using a 4ET50 transmission. The PI paper explains that some customers may comment on a whistle, scrape or whine type noise while driving that may be more noticeable during regenerative braking. Technicians may find this noise

The ins and outs of the Hydraulic Selectable One-Way Clutch

A Hydraulic Selectable One-Way Clutch (SOWC) is used in GM’s 9T50 (figure 1, above) and Ford’s 8F35 transmission (figure 2, below). Its function and design are quite clever. The center plate inside this selectable one-way clutch lugs to the Overdrive Carrier. On the top side of this center plate are spring-loaded struts. Integral to the

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TF80SC Gen 1 2-3 flared shift

The complaint A 2005 Volvo XC90 equipped with the TF80SC Gen 1 transmission has a complaint of a 2-3 flared shift. During the overhaul process a brand-new valve body from the dealer was installed, only to find on the initial road test that a 2-3 flared shift still existed. The adaption procedures were performed but

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Mazda FW6A-EL stored pressure switch codes

The complaint A Mazda with the “Sky Active” FW6A-EL transmission has its Check Engine and A/T Warning lights illuminated, with the following trouble codes stored in TCM memory: P0842 “Oil Pressure Switch #1 (pressure switch B) Stuck On.” P0847 “Oil Pressure Switch #2 (pressure switch A) Stuck On.” P0872 “Oil Pressure Switch #3 (pressure switch

Honda Ridgeline bind up in reverse, forward in neutral

The complaint A 2006 Honda Ridgeline equipped with the BJFA Transmission has a complaint of a bind up in reverse and moves forward in neutral after overhaul. The truck would roll freely with the engine off and the transmission in neutral. Since this complaint occurred after overhaul, the technician thought that a clutch was mechanically

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No forced throttle downshifts

Twenty-five years ago, Chrysler introduced a 0.187-in. (4.77mm) steel, #10 check ball (figure 1, above) in the 42RE valve body which continued to be used throughout the entire RE series of transmissions (42, 44, 46, 47 and 48RE) as they were launched. This small check ball is quite active, having several functions during the course

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Shift adaptation issues: Potential causes of a 2-3 shift bump

For shift adaptations to perform adequately, all required inputs must be functional. Of course, the solenoids and transmission components must also be functional. The type of inputs required for shift adaptations to function as designed will have some variations based on year, make and model.  For example, when Chrysler pioneered their 41TE clutch to clutch

Fixing JF011E primary pulley pressure sensor issues

A 2.4L Dodge Caliper using a JF011E CVT2 transmission developed a problem with the Primary Pulley Pressure sensor. A low circuit error code P0842 was pulled from the TCM. The sensor ground and 5-volt wiring circuits were checked and verified as good. The signal wire was then inspected and was also verified as good. There