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Been lazy about updating on here.
5/12-5/13 I installed the 3.31 rear end. Everything went pretty well. Tore it apart on Saturday late afternoon/evening then finished it up Sunday morning. My scary looking brake lines reared their ugly head when I went to test drive by blowing out the rear line so my hand was forced to replace that. I also removed the front driveshaft since the front diff is still 3.73.
5/17 I got my programmer to correct the speedometer. It is a "power programmer" and it feels like it improved throttle response and transmission shifting immensely. I have a slight concern that has actually hurt mileage but its fine for the time being.
5/18 I installed a manual switch for my electric cooling fan. Mainly did this for A/C performance at low speeds/parked.
5/19 Unfortunately I had to replace one of the axles seals in the rear end. Guess that's what I get for being cheap/lazy and not replacing them while it was on the ground. Other side is not leaking so will leave it alone for now.
5/19-5/20 We took a trip to Michigan. Got about 50 miles from home and the truck totally shut down. Found that the ignition switch fuse had blown. I hastily cut the wires for my manual fan switch. My suspicion is that somehow it back fed through the ignition switch fuse and blew it. Will have to rethink my wiring when I get back to reinstalling.
I feel that the 3.31 rear is probably a little tall. But my plan to go to a smaller tire size will offset that. On the highway it is very sluggish to accelerate without kicking down a gear, which I expected but I feel it is too much.
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