Bypass Electronic Transmission Controls

HOW-TO bypass the auto transmission controls in the 3800 PCM

I have gotten a couple of questions on how I was able to bypass the auto trans controls on a stock 3800 PCM in order to prevent early rev limiters and other drivability issues it had when I was not using an electronic automatic . . . → Read More: Bypass Electronic Transmission Controls

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AOD Conversion

The TH440-T4 (4T60, RPO code ME9) is the only GM Automatic Over Drive transmission that will easily drop into otherwise stock Fiero. I’ve been interested in this conversion myself for a long time. I’ve pulled together some of the more pertinent data into this article for those considering the swap. Maybe I’ll get around . . . → Read More: AOD Conversion

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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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Changing The Tranny Output Seal

Having had problems with shifting and popping out of gear, I found reference to a possible solution, namely synchromesh. Specially formulated for GM manual gearboxes, the glowing reviews of smoother shifts and no embarrassing popping into neutral persuaded me to try it (3 qts. at $4.99 each at Autozone). And it seems to work . . . → Read More: Changing The Tranny Output Seal

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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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Fiero TH440/4T60 Automatic Transmission Conversion

Fiero TH440/4T60 Automatic Transmission Conversion

by Karl Hamilton

I became a Fiero owner a little over two years ago when I purchased a black 88 formula with a 2.8L engine and 3 speed automatic transmission. It has been the most fun to drive of any car I have ever owned. When . . . → Read More: Fiero TH440/4T60 Automatic Transmission Conversion

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