Pastor, it's really a toss up as to which one to get... They all have their issues.. If i am remembering right, you can get the Allison with the duramax or the powerstroke and is do-able with the cummins with a conversion kit.

I have friends that have GM's and 4 of them had to have the injectors changed less than 100k miles. 2 friends with dodge's had to have the turbo's replaced less than 75k miles. And as for Ford, I only have a couple friends that have Ford's. One had a problem with the crankshaft position sensor went out less than 75k miles and the other one just bought his a month or two ago and hasn't had any problems yet.

These trucks are models from 2005-2009's.. They may have the problems fixed now.

If you decide to go with Dodge, you should give Weaver Motors a call in Kirbyville Tx. They have been having the cheapest prices around.