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Discussion Starter · #1 ·
I inherited a 99 F450 with a dead IDM, pn F7TF-12B599-AB, which apparently is a 1994 1/2 through 1999 unit. A reman outfit is offering a unit to replace all early styles, are all the various pn's for all those years interchangeable? What's the difference? Is it worth trying to get a reman unit with any modifications if I want to up power for heavy towing? No one seems to have a answer and, advice would be appreciated! Also I would love to find a transfer case and front x for this truck, what case and x was offered orginally? Thanks, davidjon
 

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they can interchange i have a 02 idm in my 97
 

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Shaking the Bush Boss
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The only other mod concerning the IDM is changing a resistor inside so it changes the voltage to 140. Search IDM mod. If you dont have a steady hand and little experience soildering...find someone who is willing to do the mod...The IDM inereds dont like heat! I burnt mine up, thats how I wound up with a 02 IDM.
 
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