2003 Rubicon 4.0 automatic. The other night coming home from work my exhaust got really really loud. I didn't hit a bump or anything like that I was merging onto the interstate and had to rev the motor to about 3000 rpm's to get into traffic. That's when IT happened. There was no pop or metallic sound that I could tell. My ride home is about 60 miles 40 interstate 20 are decent to good 4 and 2 lane highways. About a mile from my home the road turns to crap as soon as I turned onto my road ( needed paving 10 years ago )that's when IT stopped. This was during thanksgiving break so I had it in the woods for a few days taking my kids hunting no loud exhaust thru the rpm range. Went to drive it to work today and as soon as I turned off the crappy road the sound came back. I had the exhaust fixed 3 months ago they had to press fit the new down pipe/converters as I have the 2 piece manifold design on my Heep. Everything seams to still be intact I can push or pull and the exhaust has no measurable play. I have had a cracked manifold before this sound is much much worse. The gauges have not changed I do not believe this is a internal engine problem. Please let me know what else to check I have another ride F150 but it has a drinking problem.
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