can i use the same t case "under dash big knob lever shifter thingy"...or is the 79's different??
if they have a floor shifter for the t case do i have to use it that way or will it bolt up to my t case shifter?
also...if i swap the 4 speed but keep my 4.11 gears, will it make highway driving easier on it or is the rpm-cruise speed going to be about the same as with my 3 speed? its at about 2500 rpm's at about 60 or 65.....i think.
id like to keep my gears if i could.
Yes the 4spd has the same final gearing as the 3spd. You will gain no top speed with the change. The 4spd is much better than the 3spd. You get an extra gear, which makes the ratios closer and offer a smoother transition. The 4speed also has a lower 1st gear than the 3spd. and first gear is snycronized!