hello guys new here i just bought a 2000 quad cab with a 3.9 automatic for 300 dollars has a rod knocking was going to do a 360 swap but the truck is too nice and id really like to have somethin that gets more than 6 mpg so i was goin to jus throw another 3.9 in does anyone know what years will work
thanks in advance for any info

 

3.9 vs 5.2 mpg is pretty much the same. The 5.9 might be a mpg less depending on your setup. Some of the 5.9 rt guys here are getting better mpg than I am but they are 2wd.

 

do a v8 as long as you are going to do an engine swap, pointless to swap a v6, 5.2 is your best bet IMO. but maybe somebody else can answer this, would a 5.2? i know 2000 was the transition year and thats when the 4.7 was available, so maybe somebody can clarify?