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gtjeff

BGB lube?

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GregB
Someone probably used what they had. Like Greg C said, 80-90w Gear oil is the fluid I use. Do not over fill, the BGB takes a fixed amount of gear oil, before you flood the seals and make it more prone to leak. Later boxes had a dip stick, early ones you need to keep track of the amount you put in. Check a repair or owners manual for the exact amount. GregB

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MrSteele
Transmission fluid would likely be the last thing I would put in a gearbox. You would do better with HD30 oil than fluid. Best will be the multiweight 80/90 like what belongs there, as it will have more of a tendency to 'stick' to the gears during operation. If it is too thick for your liking, try lighter weight, or a good multiweight engine oil, such as 20w50. Just an opinion, though.

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JeffNemes
Simplicity specs for the BGB call for 90 gear oil prior to 1975 and Simplicity muti-purpose trans fluid thereafter starting with the 7000/7100 series that use a dip stick.

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