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Well, the 200mm 3.55 or whatever it is, is the tallest that will fit in the stock pumpkin. It’s what I have, but I have an AR5. It makes for pretty good cruising rpms. Any taller gearing and you have to go to a GS300/SC430/etc 220mm diff, offset axles, and custom mounting. M85 is 3.73, so going down to the 3.55 isn’t a huge difference, but is noticeable.

You may have already seen this site but check out Is elite. There’s some good charts and data on the transmissions and diff ratios.
 
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