LS Swap 5.3 4I60e in 04 Jeep LJ.

UNSTUCK

But stuck more often.
Scan the GM computer. Your Jeep computer will have several codes causing a fail. Your inspection may require your VINs to match so you’d have to figure that out.
 

mdbs14

Active Member
Scan the GM computer. Your Jeep computer will have several codes causing a fail. Your inspection may require your VINs to match so you’d have to figure that out.
Yes, the vin scanned must match the registration. In MA emission test is not require if vehicle is 10+ years old, but I know they still connect to obd2, my guess is to get vin info
 

mdbs14

Active Member
These are the mini cats, one on each bank before the muffler.
View attachment 176865

Dakota digital makes a shift indicator. They are kind of pricey for what they are. I found the logic truth table for the 4L60E neutral safety switch and considered using a logic control chip to feed a simple digital readout but never got around to it.
Possible to see an image of the routing of the exhaust?
 

mdbs14

Active Member
Came across these cats out of a 2014 camero v6, will these work? $200
 

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UNSTUCK

But stuck more often.
With stuff like this you really just need to get under there and figure out how to make it work. How are we supposed to know if those cats will fit in the space between your transmission, frame rail, and belly pan? We’re not there. Everything that is unique to your jeep (and everything is) will effect your exhaust system, which is why I suggested earlier to have an exhaust guy build it.
 

mdbs14

Active Member
With stuff like this you really just need to get under there and figure out how to make it work. How are we supposed to know if those cats will fit in the space between your transmission, frame rail, and belly pan? We’re not there. Everything that is unique to your jeep (and everything is) will effect your exhaust system, which is why I suggested earlier to have an exhaust guy build it.
Appreciate the reply. I ask just in case someone on here had to deal with these cats at some point, or similar size. You never know until you ask, plus many have the same engine, trans, frame configuration etc, so it's not that unique. Exhaust shops want $2000+ to put one together, to me that's cash I can save, after all it just welding up some pipes. There are a few exhaust builder kits around with different bends.
 

mdbs14

Active Member
When I bough the jeep, it came with a new, not installed 2.5" tubing dynomax super turno muffler, and the rear tail pipe that is also 2.5".
Was thinking of using it, and building the exhaust system with 2.5" tubing all around so that I dont have to bend a new rear section.

What are the benefits of running 3" pipes after the Y pipe ?
 

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UNSTUCK

But stuck more often.
My entire exhaust is 2.5” and my motor is bigger than yours. I’m using probably a very similar muffler, but Magnaflow. So far I’m very happy with it. Very quiet and no drone.
 

mdbs14

Active Member
My entire exhaust is 2.5” and my motor is bigger than yours. I’m using probably a very similar muffler, but Magnaflow. So far I’m very happy with it. Very quiet and no drone.
Does it sound like a V8 at all? I like it quiet also but not too too quiet, a like a little exhaust note.
 

mdbs14

Active Member
Almost finished building the exhaust, 2.5" pipes all around, and go my rear driveshaft shortened. I went with no cats. I don't have the o2 sensors on. I need to get the o2 bungs, drill the holes and weld them in.

I got to more the truck for the fist time. I noticed a long delay moving in reverse. I would accelerate, and the response is just very slow. Moving in drive seems okay.

What could it be?
 

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85CUCVKRAWLER

Active Member
Location
Tooele
You should install your driveshaft and check clearance with your crossover tube. My rig is fairly low to the ground and my driveshaft rubs, had to put in a bumpstop to prevent full crushing.
 
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