Have Transmission Questions? Ask a Mechanic for Answers ASAP
Hi, what vehicle are you looking to purchase? I'm assuming a Chrysler Jeep Dodge with a 3.7.
Ok, the 03 is a different body style. With the 4.0 straight 6, it has a 42RE transmission. In general the 4.0 is a very reliable engine especially if it was maintained. The transmission also is if it was maintained. The 05, 06 grand Cherokee's with a 3.7 v6 will have a NAG1 transmission. Those transmissions are built by Mercedes and have proven reliability in a lot of Mercedes and Chrysler Jeep Dodge vehicles. Both transmissions have their issues but in general hold up pretty well. If I was to say out of those 2, I'd go with the newer 05-10 body style. I'd have to rate the NAG1 trans better that the 42RE. Definitely have it checked out by a mechanic before you buy one. Some of the NAG1 transmissions don't have a trans dipstick so if you're going to check it out yourself, the dipstick is a "special tool" and you'd definitely want to check the fluid level and condition to see if it looks/smells burnt etc. Here is a link for a dipstick: http://www.amazon.com/Chrysler-Dodge-Jeep-Transmission-Dipstick/dp/B00NNXHNCO
Can I help you with anything else?