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Hey Friends.
I have 4-11 gears on the rear end of my 56 and I am looking to replace it with a highway friendly rear end. my rear end measures 59.5 from where the wheels bolt on. what GM rear ends are easy bolt ons? I have a 327 appx 300 hp with a TH350 tranny . What ggear ratio is the best for highway driving. Thanx DH
DH, everything is a trade-off. Numerically high gears like your 4.11 will give the best acceleration, but suck at mileage. Lower numerical gears in the high 2's, low 3's (2.73, 3.00 for instance) will give the best mileage, but they suck at acceleration. Most guys will try to achieve a happy medium, around 3.50 to 3.70 if they have a dual purpose car or truck with no overdrive.
Here is a chart that may help, showing some diff widths....
http://www.teufert.net/other/rear%20...dimensions.htm