February 2008 Archives - Transmission Digest
Adapting to the AW55-50SN Valve Body

Some things are less intimidating if you’re not the first to do it. That statement applies to both crossing a frozen lake and working on a problematic AW55-50SN. On the lake, heavy snow cover can prevent you from telling whether the ice is sufficient for support, and what you can’t see may end in a sink-or-swim experience. On the 55-50SN valve body, a clean core does not mean the valve body is functioning correctly.

It’s All in the Details

If you want to rebuild a torque converter and do a good job, you need to pay attention to many details. Unfortunately, in today’s business environment that critical attention to detail is often sacrificed in the race to just get the job done and get it done quickly. If you were fortunate enough to have a good mentor when you were learning about torque converters, you learned that there’s a right way and a wrong way to perform most tasks. In some cases there’s a right way and several wrong ways to do the same job.

Tremec’s New 6060 Six-Speed

The T56 six-speed transmission has been around for many years now. Originally designed by BorgWarner for the GM F-bodies (Camaro/Firebird), the design has been refined since Tremec bought the BorgWarner manual-transmission business. The T56 is now the six-speed of choice for the Ford Mustang, Chevrolet C5 and C6 Corvettes, Pontiac GTO, Cadillac CTS-V, Dodge Viper and Sidewinder, and Aston Martin Vanquish.


The 6T75 has been on the road for a little more than a year now, and we’re beginning to see some problems with this unit. The first problem we ran into was at a Miami shop that was doing factory-warranty work for a local GMC dealer. The problem vehicle was a 2007 GMC Acadia, and there were some problems with the two-wire Hall-effect speed sensors.

Eight Qualities Every Leader Must Possess

Recent statistical surveys show that only 10% of employees look forward to going to work, and most point to a lack of leadership as the reason for their discontent. Many, at management level and below, don’t believe they are given the proper direction, motivation or attainable goals to make the daily contribution to their employers worth the time and effort they are asked to put in. In other words, they are uninspired by their so-called leaders.

Out of Sight, Out of Mind; What a Waste of Time

In the world of transmission diagnostics, from time to time there is a scenario in which the diagnostics performed ends up being a waste of time. In some situations it can be partially attributed to the “out of sight, out of mind” syndrome, as is the case with a 4L30-E transmission in Isuzu Trooper and Rodeo vehicles. The problem occurs mostly after the transmission has been re-installed.

February 2008 Issue

In This Issue
Toyota A340 Series Transmissions: Checkball locations in 2000 & later models