The Assembly Line Diagnostic Link

Warning! Don’t force anything into the ALDL connector! If you damage the connector then you can have problems when using ECM scanners and other tools that have the proper size terminals.

Note! It is possible that the ALDL may be installed with the Key up or down. The above picture is Key . . . → Read More: The Assembly Line Diagnostic Link

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4 Speed Automatic for your Fiero – 440-T4/4T60/4T60E

4 Speed Automatic for your Fiero – 440-T4/4T60/4T60E

The Turbo Hydra-Matic 440T4, later renamed Hydra-Matic 4T60, and the Hydra-Matic 4T60E are a popular swap for the Fiero. This is partly due to the fact that they are original equipment with many of the popular engine swap choices. They provide an additional gear (overdrive) . . . → Read More: 4 Speed Automatic for your Fiero – 440-T4/4T60/4T60E

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Torque Converter

Torque Converter Lockup.

Why is TC locking important?

The biggest reasons are fuel economy and heat control. The TC is the car’s single biggest heat generating device besides the engine. The transmission will run significantly hotter if the TC doesn’t lock. Before listening to people that tell you it doesn’t matter read this article . . . → Read More: Torque Converter

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The Ever Popular TH125

There are a bunch of things about the TH125c transmission that need to be kept in mind when working on it. This is a collection of the issues asked about in the forum. It’s by no means a complete list of things. It does however cover some obscure things needed by customizers.

Shift Problems

. . . → Read More: The Ever Popular TH125

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Lockup Solenoid

The Fiero TCC (Transmission Solenoid Lockup)

by Chuck Kichline

http://www.kichline.com/chuck/fiero/TCC.htm 7/10/2008

I found out that there wasn’t a lot of information on automatic transmissions for the Fiero on the web, and even worse, both the Haynes and Clymer manuals are weak on diagnosis and had NO information on repair.  It became very important to . . . → Read More: Lockup Solenoid

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