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I'm not sure what you mean by what size, but if you are talking about how many speeds, I believe the early 1988 Broncos came with a 3-speed transmission and the later 1988s came with a 3-speed with overdrive. Most of the information I've found online shows that the 1988 came with the 3-speed, but I own a 1988 (it was built towards the end of 1988) and it has the 3-speed with overdrive.

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18y ago

What else can I help you with?