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What kind of fluid should be used in a chev 4wd 34 ton manual 5 spd tranny?

A 1934 Chevrolet 4x4 3/4 ton truck with a 5-speed manual transmission is extremely rare, if it even exists. Chevrolet didn't produce 3/4-ton 4x4 trucks with 5-speed manuals in 1934. The technology simply wasn't there.

Therefore, specifying the correct fluid is impossible without more information. To get the correct answer, you need to:

1. Verify the year and model of your truck: Double-check the year, as even the model is highly suspect.

2. Identify the transmission manufacturer: The transmission likely wasn't made by Chevrolet. A tag or casting mark on the transmission itself may identify the manufacturer.

3. Find a transmission manual: Once you know the manufacturer and model of the transmission, you can search online or consult a manual for the specific recommended fluid.

Without accurate identification, any fluid recommendation would be pure speculation and could seriously damage your transmission. If you're working on a restoration or have found a very unusual truck, consulting a specialist in vintage Chevrolet trucks or transmissions is highly recommended.