Hey Scotty, I know how you feel about jeeps but I was gifted a 2007 Jeep Grand Cherokee with the 3.7L V6 with 157k miles not pretty but it drives well, temps are good even has ac. Is it worth putting money into the car or should I just sell it and try to get something else?
Clarification: Do you have a primary vehicle already?
With the price of gas getting higher and higher I'd try to sell it now as fast as I could plus with that mileage it will probably fall apart soon
Hi Thebeetle!
I own a 2005 Jeep Grand Cherokee. It has the 4.7 V8, which is essentially the 3.7 with two more cylinders. The engines look practically the same except for size. Mine has 186,000 miles on the clock. My Dad's had 337,596 at time of sale.
The issue with the 3.7 WKs is not the engine - its the transmission. A WK Grand Cherokee with either the 4.7 V8 or 5.7 V8 would be a pretty good idea to keep. The V8s have a 545RFE transmission that is extremely reliable when flushed every 30,000 miles. The 3.7 V6 has a NAG3 transmission, and that is a piece of junk from what I have seen and heard.
I'm a mechanic and have driven a few of these 3.7 WKs - they shifted terrible. The engines are pretty good, but the NAG3 tranny is just not going to hold up from what I've seen.
So, I'd recommend selling that '07 and either getting a WK with the 4.7 V8, if you are into Jeeps. Or a Toyota - that would be best! 
