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Re: Just had Rear Main Seal Replaced
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Final Update.....
I have had the truck back for two days. The truck seam to run better and a little better MPG. It has a noticeable improvement in get-up and go, and the average MPG, via computer, has improved from 16.5 to 17.8.
I hope it runs like this for the next 100,000 miles.
It took one day for the repair, in at 7am out at 5pm.
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I had a couple of pinion seals go. Some of the other posts above seem to be talking about fluids emitted from the engine/trans, not the rear. Staying on point here, I can tell you what it probably is. When you generate a lot of power going to the back, the angle of the drive shaft going into the differential is not maintained 100%. You might not be able to see the flex, but it is definitely there. Each time you romp on it, you effectively stretch the pinion seal a little. Over time, the result is a slow leak. Since I am running a lot more power, I had traction bars added and sway bars. See pics in link. That stiffens the rear which reduces the flex under load.
One interesting thing to note in your case is the increased mileage. Had it been that high earlier and slowly trickled down (which you'd expect if the pionion seal was loosening)? It may also be that the drive shaft was never 100% aligned; this would cause pinion seal damage even without a load, and would result in a leak over time. Then, when they replaced your pinion seal, they probably also got the alignment corrected and that reduced friction to the rear; net result: better mileage and acceleration.
RL
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