480LE Issues?

Greetings,
I'm about to buy a 91 suburban diesel with a 480LE in it.
I know TH350s, but not 480LEs. I'd be interested in hearing about known problems, reliability, suggested upgrades,
etc., for this beast.
I will be doing light to medium towing with this thing, but not more than about 5000 lbs.
TIA for any suggestion/hints/pointers, etc.,
--Duncan
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it's an electronically controled 400 with an overdrive hung on the front
big cooler, regular fluid and filter changes

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