Nobody454 Posted October 8, 2016 Share Posted October 8, 2016 looking at a 2004 granite with a AMI-300 300 hp with a 8 speed mack trans. Can the hp be turned up some? 300 seems a little low for what I do, but not sure about turning it up Thanks for any input Quote Link to comment Share on other sites More sharing options...
storkmack Posted October 8, 2016 Share Posted October 8, 2016 I think I know the trucks you are talking about. Pretty sure they are old Harry Kuhn trucks. Believe you would have to swap cams, turbo, and timing? Those 8 spds are the 3 dirt gears 5 street gears type. The pricing and mileage are attractive, but I think it would take to much money To make them usable. Quote Link to comment Share on other sites More sharing options...
TeamsterGrrrl Posted October 8, 2016 Share Posted October 8, 2016 300 HP is plenty usable, especially at straight truck weights! Quote Link to comment Share on other sites More sharing options...
Nobody454 Posted October 8, 2016 Author Share Posted October 8, 2016 sure look like Kuhn trucks, but they seem to have maint records from day one...definitely plain jane trucks like Kuhn. 89000 miles and 4500 hrs on a 04 seems very low to me. our 07 granite has about 120k and 11000 hrs - by the time I put alum rims and whatever else in it, I might as well buy something else. But the price sure seems like a good deal for the miles! I think hauling 80000 with the 300 and a 8 spd would suck most of the time Quote Link to comment Share on other sites More sharing options...
storkmack Posted October 8, 2016 Share Posted October 8, 2016 Kuhn had about a dozen that got left at Northern Illinois Mack when HWK closed. We have 2 Mack Granites with the AMI 400 hp, and they couldn't pull a sick whore off a piss pot. The 427's are decent, but even that isn't saying much. Quote Link to comment Share on other sites More sharing options...
mackey58 Posted October 9, 2016 Share Posted October 9, 2016 Where are these trucka I'd tell my boss .l haul 72000 with a 300 and seven speed ain't an airplane but gets the job doneb.the granite 6 wheeler we have has an ai400 mack 10 sp with the 5 speed reverse. 4.64 rears it runs pretty good.the 427 with the 4.42 seems kinda lame in the last gear on the 13 sp.it's in an 04 granite Quote Link to comment Share on other sites More sharing options...
Mackpro Posted October 10, 2016 Share Posted October 10, 2016 On the AI engines you just need a turbo and inectors and download to go all the way to 460 HP. Your local Mack dealer can submitt a HP change request via Macks email system and tell you what part numbers you need and the cost of the download if any. We do it everyday here. On the AI engines, we have had Mack say they could not go to 460 due to some EPA issue for that year but were able to go to 427. Also on the AI engine , 4.42 gears are the hightest i'd ever go with . 4.64's work best tall 22.5rubber. You could have your dealer do the software updates (Step 12B)on the 300 and see if it helps if it hasnt beed done yet. Quote Link to comment Share on other sites More sharing options...
TeamsterGrrrl Posted October 10, 2016 Share Posted October 10, 2016 The highest rating that would be compatible with the wide ratio transmission is 370HP. Quote Link to comment Share on other sites More sharing options...
Nobody454 Posted October 10, 2016 Author Share Posted October 10, 2016 thanks for the info! Quote Link to comment Share on other sites More sharing options...
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