Sorry if I missed it in your older threads but have you tried a lower ratio manual box out of a S10 or older car that came manual. I'm guessing that bolt pattern is the same on all boxes or that the frame can be drilled to accommodate. You'd probably have to reuse your old pitman arm since the suburban probably has different geometry than a smaller car but it may be manageable.
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-Mike
2007 Ford Focus ZX5 - 91k - SGII, pending upper and lower grill bocks - auto trans
1987 Monte Carlo SS - 5.3/4L80E swap - 13.67 @ 106
2007 Ford Focus Estate - 230k - 33mpg - Retired 4/2018
1995 Saturn SL2 - 256K miles - 44mpg - Retired 9/2014
Cost to Operate Spreadsheet for "The New Focus"
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