When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
3.5 is most common for auto trans, 3.2 for 5 speed. 3.5 and 3.9 can be found in the 4 cylinder trucks.
There really should be a tag but it is usually up at the top hiding under the brake line crossover....