California Heavy duty 4340 axle shaft swap causing ABS, traction control and cruise control warning lights...

[SoCalGladiator]

Hi all,

I put 37's on my Gladiator Rubicon and decided to re-gear to 4.88s. Best choice ever. While the shop was doing the re-gear, I bought
upgraded heavy duty Dana Spicer 4340 rear axle shafts since install would be free while doing the re-gear.

Upon picking up my Gladiator, I was told that my dash was now lit up like a Christmas tree with ABS, traction control, and cruise control
warning lights. The shop cleared the codes and they came right back. Cleared them again and test drove it for 10 miles. The ABS and TCS
lights went away but the adaptive cruise and cruise control lights were still on. When I tried turning on cruise or adaptive cruise control, I received
a "service cruise control" message on the dash.

I know that sometimes when changing sensors (like new tone rings on new axle shafts), the computer needs a few on/off cycles and some
time before everything syncs back up.

So I decided to drive it the 60 miles home from the shop. Stopping twice for errands to see if adding some miles and on/off cycles would help.

After the second stop, all lights were gone and cruise control function returned to normal.

I was wondering if anyone else had upgraded rear axle shafts and have had the same "break in" period errors like I did? She is running fine and all
is still working perfectly.

By the way, if you want 37's on upgraded/heavier rims on your Rubicon, 4.88s are the perfect gear ratio. It drove better than stock. Same RPM at 65 mph
and no more constantly downshifting to 7th and 6th gear on the freeway.

Thoughts, input?

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[brianinca]

QUIT SPENDING MY FUTURE MONEY! No, seriously, thanks for this, useful data for sure.

 

[Renegade]

I have a friend running those axles. He didn’t experience that. I would think it might be the gear swap rather than the axle shafts which caused that. Did your shop reprogram your Jeep for the new gears? If not, the computer is seeing different wheel speeds than it expects, which would probably cause all of that. (BTW- This is in the Marketplace forum)

 

[SoCalGladiator]

I have a friend running those axles. He didn’t experience that. I would think it might be the gear swap rather than the axle shafts which caused that. Did your shop reprogram your Jeep for the new gears? If not, the computer is seeing different wheel speeds than it expects, which would probably cause all of that. (BTW- This is in the Marketplace forum)

Yes, we programmed the gears with a supership

 

[gsxr310]

OP, who did the work?

 

[Renegade]

I installed a set of these axle shafts in my Jeep today with no issues.

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