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What kind of transmission fluid do you use for your 1974 Pontiac lemans with 350 big block?

A 1974 Pontiac LeMans with a 350 big block likely used Type A ATF (Automatic Transmission Fluid) if it has an automatic transmission. However, it's crucial to check your owner's manual to be absolutely certain. The specific type of ATF may vary slightly depending on the exact transmission installed (e.g., TH350, TH400).

Important Considerations:

* Condition of the transmission: If the transmission is old and hasn't been serviced in a while, you may need to flush it and use a fluid designed for older transmissions or a fluid with added conditioners. Simply using the correct type of fluid might not be enough to revive a neglected transmission.

* Modern ATF vs. Older Formulations: While Type A ATF is the historical standard, some modern ATF fluids might be compatible (check the fluid's compatibility chart). However, using a modern fluid *without* checking is risky, as it could damage seals. Sticking with a Type A ATF formulated for older transmissions is generally the safer bet.

* Additives: You might consider using a transmission fluid additive designed for older transmissions to help improve performance and extend the life of the transmission.

In short: Find your owner's manual. That's the definitive answer. If you don't have it, contacting a Pontiac specialist or a reputable transmission shop is your best bet to get the right fluid recommendation for your specific vehicle. Using the wrong fluid can seriously damage your transmission.

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