Ok, go here:
http://www.4x4cyberstore.com/website/rpmchart.html
Figure out your tire height and then hit the highway and calculate backwards.
For 25.5 inch tires and a t-5, go 3.55's. For 25.5's and an AOD, go 3.73's
For 26.6 nich tires and a t-5, go 3.73's (hell, I'd go 4.10). For 26.6 inch tires and an AOD, dude.....go 4.30's and nothing less.
I ran a 3.73 and 26.6 tires and a t-5 and got 23-24 mpg with a carb. I got 22-23 with the same and an AOD. I'll let you guys know what aod , 26.6's and 4.56's get soon =D
For FMS gears, you can reuse your existing side shims. You only need to worry about the crush sleeve and pinion depth. This you can do trial and error with grease and looking at the contact pattern on the gears. Install, grease and turn. Observe, tighten if necessary, turn. Reassemble, go for a drive and let off the gas. If it makes noise, tighten the pinion nut and go for another drive. Repeat until there is no noise.
You WILL need an aluminum driveshaft for the higher gear ratios.
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91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior
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