Gear swap from 3.73 to 4.11 question

[Heartbeat Hauler]

Hi guys, my brother has a '99 1500 4x4 and has upgraded the front & rear diffs from 3.73 to 4.11. The shop that did the upgrade used a Yukon ring & pinion, but reinstalled the original 3.73 ABS reluctor. The PCM was sent to PCMFORLESS so the computer would recognize the gear swap. Now, the problem is that the ABS light stays on all the time. I know over on the ImpalaSS forum when ever someone upgrades from 3.08 or 3.73s to 4.10s a new reluctor is required. Is this the same with the tricks? What do you guys think?
JP

P.S. On a 4x4 does the front diff have an ABS reluctor or is the sensor on the front wheels like a 2wd model?

[Heartbeat Hauler]

Well, I have since found out that the rear ABS reluctor is located on the output shaft of the transfer case, but still no idea if a new reluctor is required when swapping gears from 3.73 to 4.11.
JP

[Heartbeat Hauler]

Heeelllo lo lo lo. Anybody in here? in here in here in here. :D
JP