Marc's Build

Hey guys - been a while since I've done any work on the rig. After I put my 33's on, I haven't been getting a ton of power on the highway and I can only go about 60mph full speed. Also been getting much worse gas mileage than before, which was to be expected... I would think this means I need to re-gear. Any other thoughts? Do you know any good shops that have done this before, preferably on the south shore (i'm in Canton). If so, any price estimate? Thanks

Is is 6 cylinder i see on fender, Automatic/manual? Current Gear ratio? #s
Sounds like you need to re gear.

Mark wrote:Is is 6 cylinder i see on fender, Automatic/manual? Current Gear ratio? #s
Sounds like you need to re gear.

Probably should have included more detail... yeah, it's a 6 cylinder 4.0L manual. Not positive on the gear ratio but I would think it's the 3.07. Basically everything about the Jeep was stock when I bought it and now it has the 4" RC lift.

Usually most the manual trans 6 cyl TJs have 3.55 or 3.73s
A lot of the Automatics came with 3.07s.

I recently swapped my girl's tj from auto to manual, it has 3.07s with 31s and it's a slug in 5th gear on the highway.
My TJ has 373s manual trans with 33s and is a slug also in 5th gear on highway.

Are you sure that ratio is 307 ?,, is either front or rear tag still on diff covers?

Mark wrote:Usually most the manual trans 6 cyl TJs have 3.55 or 3.73s
A lot of the Automatics came with 3.07s.

I recently swapped my girl's tj from auto to manual, it has 3.07s with 31s and it's a slug in 5th gear on the highway.
My TJ has 373s manual trans with 33s and is a slug also in 5th gear on highway.

Are you sure that ratio is 307 ?,, is either front or rear tag still on diff covers?

Hey Mark - Sorry, I absolutely forgot to respond to this thread a long time ago. I actually have 3.55's so sorry I was mistaken before. D30 in the front w/ 3.55 and D35 in the rear w/ 3.55. I definitely need to re-gear in the near future, and spoke with Ryan about going to car-part.com and try to find used axles that have already been geared. I don't think there is a point in regearing a D30 or D35, so I'll either get new axles or wait until I can find something used.

Jeep failed inspection this week. Apparently there is a hole in my tail pipe (which is completely rotted through so not exactly a big shock). With that being said, I think this is probably the best time to upgrade the overall exhaust system. I'm looking for something that makes the Jeep SOUND a little bigger without being obnoxious. I'm torn between:

Dynomax #17345
http://www.quadratec.com/products/17605_5001_07.htm and

Banks
http://www.quadratec.com/products/17603_601X_07_PG.htm

I've heard great things about both (and most magnaflows) and figure the Dynomax will be a little quieter. The Banks seems to be a little louder/better quality without being overly aggressive.

Do any of you have experience with either? How is the install? I've researched this for hours and have found entirely different responses (as with anything, I guess) depending on the rust, etc. Seems like something fairly straightforward and should be completely bolt on with no cutting but I know a lot of people haven't had that experience.

I'm pretty sure I have the Dynomax one. It's nothing crazy. A little louder than stock, probably, but without any unreasonable droning or the like.

As with any exhaust work, hope for the best, expect the worst. If you have a body lift it will be easier.

I will be running Magnaflow in the near future.

I had a Dynomax non stainless muffler, it was my first exhaust i had installed on my jeep and it didn't last long, the muffler rotted out quickly.
Now i have the complete Magnaflow stainless system from the manifold to tail pipe,  it went right on w/o any modifications at all.
It also came with the catalytic converter .

Whichever one you get just make sure its stainless. either 409 or 305. Note that one of these two while being stainless will get surface rust/spots, you should look for the one having higher chromium or chrominium (not sure of the exact wording)

Since you asked the other day, I've got a Magnaflow cat-back and muffler, with an immediate turn-down after the muffler. Pipe doesn't go over the axle which allows it to compress while flexing without damaging the pipe. Decently loud, good tone, no drone... all for under $200. If your cat is good, go with the smallest muffler you can and put a turndown!

Awesome. Thanks for the advice. I had originally thought the Dynomax was stainless but in looking again, it's not. I think T304 is the higher quality. Something like 20 or 25% chromium if I remember correctly. I'm going to try to order something this weekend so I'll keep you guys posted.