September 2002 Archives - Transmission Digest
The State of the Union on Standard Transmissions

In days gone by, cars were built with manually shifted transmissions as standard equipment, and automatic transmissions were an extra-cost option. This gave rise to the term “standard” as a reference to the stick-shift transmission. Along the way, automatics have steadily gained market share and now make up about 80% of the market in the United States. In Europe the opposite is true. Automatics are slowly gaining popularity, but just a fraction of the cars on the road are self-shifting.

Part II – More 4L30 E Problems (Lots More)

Problems and Fixes for the 4L30 E transmission.

September 2002 Issue

Issue Summary:

After rebuild, 4R44/55E and 5R55E units may exhibit delayed engagement when hot.

Some full-size GM four-wheel-drive trucks may experience a “Service 4WD” indicator light that remains on.

After replacement of the turbine-speed sensor, Ford/Mazda CD4Es may experience a persistent gear-ratio error.

In Daewoo Lanos, Nubira and Leganza, there may be a variety of drivability complaints after repairs.

Technicians may encounter difficulty removing torque-converter bolts in some GM units.

Using the factory-specified fluid is essential with ZF automatic transmissions.

Driveline vibration may occur under certain condi-tions in 2000-model GM trucks with a 4L60-E.

Replaced the What?

Sometimes a problem with a vehicle requires quite a bit of diagnostic head scratching, at the end of which you finally find what is causing the problem.

A Transfer-Case Identity Crisis

So in your ever-expanding list of causes for stacked upshifts in computer-controlled transmissions, even if it is a two-wheel-drive vehicle, investigate the possibility of a four-wheel-drive-low command being the culprit otherwise known as a transfer-case identity crisis.