As the build saga continues... I have a chance to snag a set of axles out of an 88 'burb cheap - like 250 bucks. Got to drive the rig and nothing seems out of place - he's just doing a major (like 2 1/2 ton Rockwells) upgrade and wants to get rid of these axles. Only issue is the axles have 3.73 gear sets. I run 32's and am trying to dump my 3.08 gears. I don't plan to go any bigger tires on this rig as I tow with it and would like to keep it fairly civil. Here are the calculations I ran comparing the 3.08's to 3.73 and 4.11. These are based on a 700R4 OD Ratio of .7:1 3.08 with 33's 2100 rpm= 66 mph 3.73 with 33's 2100 rpm= 54.5 mph 4.11 with 33's 2100 rpm= 49.5 mph Or I can convert that to RPM@Speed 3.08 @ 65mph= 2070 RPM 3.73 @ 65mph= 2507 RPM 4.11 @ 65mph= 2762 RPM Highway crusing and towing would be a bigger consideration for me then grunt. If I'm running a trail I'll put her in 4 low and have at it. My only problem is that I don't know where the ideal crusing rpm is for a TBI 350. I seem to remember somthing about 2400 RPM but I'm not sure - input here would be very helpful!