I just bought my first power wagon yesterday and am filled with questions , i drove my truck home 400 miles after buying it and was only able to do between 55 and 6o miles per hour. The truck is a stock 67 w2oo model with 4.88 gearing so i knew it was limited on speed. What i would like to do is change the differentials out with something more high way friendly speeds. I would apperiate all information and suggestions on this subject what years will work gear ratios and parts needed to make this conversion. Thank You in advance and may everyone have a blessed Easter. Rick Walker.:)