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1978 small block , whats recomended fluid for the auto gearbox and can i fill it from the gauge neck instead of the box ,how many litres will the gearbox hold am in the Uk , thankyou .
The transmission has to be filled from the transmission dipstick tube/gauge neck, there is no other way.
Without knowing what is sold in the UK it is hard to recommend a specific brand. It has to meet Dexron III standard at the minimum.
Buy 5 quarts and start checking after you put in 4 quarts.