1986 K10. 290hp 350 with mild cam and headers. 700r4 trans. 4" lift 35" tires. Currently running Dana 44 front, Corp 14 rear, both 4.10 gears. Gutless wonder constantly hunts between 3rd & 4th on even the slightest inclines. Prolly due to about 2k rpm. Frustratingly anemic and 6-8mpg due to the constant shifting or need to take it out of OD just to run on the highway. Towing is an absurd struggle. Thought 4.10 would be the solution...took people's opinions and didn't research properly. All gearing charts show me that to get back to stock ratio I need to go 4.56. However if I want a big more snap than stock and better tow ability, go with 4.88s. I'm told that mpg will increase to 12-15mpg depending and totally change he habit and feel of running down the road. Also told that top speed will depend upon my motor build so 80mph + will be possible with the 4.88s.....thoughts?