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05-05-2008, 05:42 PM
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Registered User
Join Date: Mar 2007
Location: Orlando, FL
Posts: 21
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Gear ratio for LS swap??
Ok....Here we go! I'm sending my PCM to Speartech for the reprogram. I'll be
running a 6.0l LQ4/4L80E in my '72 short bed with 275/60-15 tires, 28" diameter. This will be a driver, so economy is at the top of the list, but I don't want it to be a dog either. The new truck/vans with this combo (3/4 and 1 ton) run a 3.73 standard. I was thinking 3.08. What do y'all think?? Thanks in advance for your input 
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