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To process order, I need to know the year make and model of vehicle.  What engine and transmission it has in it, as well as what modifications have been made to engine and with 1989+ ¾ or 1 ton vehicles and 1992+ ½ ton vehicles, I need the 4 letter code off the top of the original chip in that computer, typically located behind the glove box. 1985-1986 TPI vehicles have a 3 letter code that I need and late 1986-92 TPI I will need that 4 letter code. CUSTOM chips please fill out the custom tuning form and if you have done that previously then please resend right after payment as I get a LOT of email and hard to keep track of it. If you pay with a different name or email than you have previously contacted me with then I need a message stating that too so that we keep the confusion to a minimum. DISCOUNTS. I am going to offer a couple discounts which I will list on a different page and you will click on that DISCOUNTS to get to that page.