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Merchant Auto is a great site to order parts, filters, fluids, etc from.

Amazon & Diesel filters online has the cheapest price (that I know of) on AC Delco fuel filters.

Allison Transynd fluid is almost always cheaper online then from a near by Allison dealer.

Wally World (Walmart) has Rotella, Mobil, & Delo engine oil for cheap.

The trans spin on filter from a Allison dealer are $8-$10. Go on Allisons website to search for a near by dealer in your area.
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