March 2019 Archives - Transmission Digest
Not All Customers Are Good Customers

In defining a good (or bad) customer, you need to determine the factors that matter to your company. It is important to consider and evaluate the specific factors that impact your business, and how it should view its customers.

Hydraulics Fundamentals: Secondary Regulators

Jim Dial discusses the importance of understanding hydraulics when working with transmissions.

Helping or Hurting

When you cut open a rebuilt converter, you never know what you will find. There are always similarities in the converters because most rebuilders follow the same basic format. It is the differences in the rebuilt converters that make them stand out.

Tools for the Excellent Manager: Shopping for Insurance

If you want to have some fun or wind up with a splitting headache, shop around for insurance. If you think new-car salespeople confuse and frustrate you, you haven’t seen any kind of razzle-dazzle ‘till you shop for insurance. Whether it be for business, homeowners or automotive the game is afoot as soon as you go onto any website and ask for an insurance quote of any kind.

Two Unique Situations, Two Happy Customers

All of our initial diagnostic evaluations include a battery and charging system test. I’ll bet you can guess the outcome of this one; the battery failed, but the alternator had passed. At this point we informed the customer that some electrical testing was going to be necessary in order for us to find out what was causing the problem. The customer agreed to that and we then proceeded with the job.

Another Heart Break

A 2014 Nissan Versa arrives at a shop on a flatbed with a customer complaint of a loss of engine power. The reason it was brought to a transmission shop is the type of engine power loss it had. In park or neutral, the engine can rev up to 2500 rpm easily. Even in drive with the brakes applied, you can reach stall speed torque with no power loss issues at all. But, the moment the brake is released to launch forward, as soon as it starts to roll there is an immediate loss of engine power.

CVT 7 Troubles

The CVT 7 used in Mitsubishi and Nissan vehicles (Figure 1) is unique in that between the pulley assembly and the differential is a planetary gear set controlled by a reverse brake, a low brake and a high clutch.

March 2019 Issue

In This Issue
GM 4T65E: Front Seal “Walk Out”
GM 6T40 Series Transmissions: No Third, Fifth or Reverse Gears
GM 6L80/90: No Fourth, Fifth or Sixth Gears
GM 6L80/90: Clutch Clearance Specifications

Ford Motor Company and the Hat Trick

Transmissions are complex and co-dependent mechanisms. Their architecture may reflect early design or the collaboration between competing OE manufacturers, but there always seem to be differences. Charging into this complexity is Ford Motor Company, with the concept of creating a new front-wheel drive design and doing it in partnership with General Motors Propulsion. This is not the first time for these two companies, but it may be their most complicated partnership yet.