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Will a 200 transmission work on 1984 Chevrolet 305 4 bolt main?

A "200 transmission" is vague. You need to specify the *type* of 200 transmission (e.g., TH200-4R, Powerglide 2-speed). The 1984 Chevy 305 with a 4-bolt main is also not specific enough; the transmission's mating would depend on the specific details of the engine's bellhousing bolt pattern.

To determine compatibility:

1. Identify the specific transmission: Look for casting numbers on the transmission case. This will tell you exactly what type of transmission it is (e.g., TH200-4R, Powerglide, etc.).

2. Identify the engine's bellhousing bolt pattern: This usually involves counting the bolts on the engine's bellhousing. Different transmissions have different bolt patterns. A picture of your engine's bellhousing would be helpful.

3. Consult a parts catalog or online database: Once you know the specific transmission and engine bellhousing pattern, use a resource like a Chevrolet parts catalog (many are available online) or a site like Summit Racing or Jegs to verify compatibility. These resources can cross-reference transmission types to engine blocks and their corresponding bellhousings.

Without this specific information, it's impossible to say definitively if a 200 transmission will work.