if you look at your dash from the outside, then you'll see a number stamped onto a little metal plate, this is called a VIN, or vehicle identification number, then find a VIN decoder online and you can find out what type of engine your truck came with from the factory.
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1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)
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