just go with a take out 3.42 rearend, 99-02s will have a torsen diff from the factory (unless it was an slp ss) which is way better than the 98 and older auburn pos. i doubt youll want a 3600 in an LT1 that only has bolt ons (unless your tony) a 3000 max would most likely suite you well, especially since youre concerned about mpg.
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1999 Z28 T-Top M6 - LS6, Bolt Ons, Suspension, MWC Narrowed 9" - 415rwhp 385rwtq 10.847 @ 125.17
1989 IROC-Z H/T M5
2006 F350 SCSB 4x4 6.0L Diesel - Studs, EGR Delete, Powermax Turbo, Extreme Tuning & Exhaust - 13.23 @ 101
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