i have a 95 2wd 3.9 and i just replaced the plugs and asked the guy at orielly for the 3923 that everyone talks about but he said they werent for my truck so i got the 3924s and i was wondering if they were better or worse or if there is a difference i know they are better than the 5224s that the guy from autozone scammedme out of thanks for the help

 

Well for stock style plugs the 3924 and 5224 is what you would want to use. The 3923 is one cold range lower than stock. These are not going to be listed for the truck because it is not stock style. By getting colder range plugs you can improve performance and it will decrease pining if you have it. There is lots of info out there. Here is a site with lots on it. http://www.pavementsucks.com/forums/...hp?topic=64498