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Guess it's all about what you want. I can easily see 37's and a 4:1 Tcase working ok offroad, but just can't fathom how 37's with an SD33 NA and 4.88's on the hwy would be acceptable unless you had a 2.5" exhaust and a better intake. Even then A pyrometer is going to be a must because with...

FYI, I just finished regearing my converted CJ10A back to 4.88's. (long story, but the short version is, the conversion process from a tug to a truck involved FSJ WT axles with 3.31's in them) Anyway, 37"-39" tires with the SD33NA and 4.88's might not be a very good combination on the...