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Installing JL axles onto a JK

39919 Views 49 Replies 19 Participants Last post by  thedirtman
Long story short, I ended up installing 2018 Sahara JL axles on my 2016 Sport JKU.

JL axles are a bit wider, given I've got adjustable control arms, track bars, the geometry is pretty much spot on. However I ran into a few issues:

- Rear JL axle shock mounting brackets needed to be angle-adjusted, since JL shocks are mounted onto the inside of the frame. Easy fix - cut ant weld the brackets back on.
- Rear diff drive shaft flange is slightly different, but Adams Driveshafts made me a set of driveshafts that work perfectly, I needed new ones anyway.

- Now is a more complex issue and I hope people can help me to figure it out. It seems that JL wheel speed sensors work differently, because I get almost double speed shown on the dashboard, i.e. 40mph instead of 20mph. I did count the number of tone ring teeth which seems to be 52, same as JK. I did program correct axle gear ratio, tire size, etc.

Wrong speed measurement is annoying, but what's more annoying is the fact that my traction control is playing up, it tends to kick in hard when I am making turns at slow speeds. The light flashes and brakes are kicking in. No error codes are shown that the wheel speed sensors are bad or malfunctioning.

So I am puzzled here. I do have a way to debug the hell out of my jeep, so any tips and help is much appreciated.
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Fixed images on the previous post.
Good morning!! I'm about to do the same axle swap and was curious about your end result with the wheel speed sensors.
Hey. Everything worked out just fine as described previously. I have been driving my JK with JL axles since then, zero issues whatsoever. No handling issues, no death wobble.

The only issue I have, which I have a solution for, just need some time to do it, is JL's OEM draglink and tie rod are very poor in terms of quality. It's very likely you you will run into this too.
Thanks for the quick reply!! Dd you end up using the JK wheel speed sensors in the JL axles, front and rear?
Yes, I did. The front fits right in, but the rear ones won't. You will have to make the holes larger, see previous messages in this thread for more details.
Thank you sir for the info and great right up!!
@NvN8v how did you make out? I still have the axles and am considering the install again. @vaijab would love to see pics of the shock mounts on the rear axle
Unfortunately, I'm recovering from back surgery and can't get out to start the swap yet. I've talked with a couple of people that have offroad shops that tell me aside from the rear shock mounts and the sensor issue, it's a pretty straight forward job. I'm going to cut the rear shock mounts off and reuse if possible. If not, I will fab a pair to fit. I'm also going to drill the rear speed sensor hole to fit the sensor from my '07 JK, Pretty straight forward with the axles out and waiting to be installed. I will also have a set of drivelines built for the swap. I will post pics and update as soon as I start the swap.
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