If you're going to have the job done, they'll probably need to drain and refill it. Like Sperry said, the front and center diff share fluid with the transmission. The dipstick beind the intercooler is to check that fluid level. In a pinch, any 75W-90 gear oil would work, but check the other thread from today on gear oils. I'd say just get OEM but I don't think Lithia even carries it. They told me they put Penzoil in all their manual transmissions. Summit Racing has the Redline Lighweight Shockproof. I'd grab 4 quarts of that and just have Allison fix the leak and fill with the Shockproof LW if they aren't gouging you. You'll have to post up what actual seal is leaking before anyone can tell you if they're gouging you though.
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