• You must be VERY CAREFUL of the physical ratio
before programming. Many people are told they
have one ratio, or forget what ratio they have,
or are told in is some ratio, when these people
program that incorrect ratio – some vehicles (with
A580 transmissions) will not shift at all. They will
start and remain in second gear, this is called
“Limp In” mode.
• “Limp In” can be diagnosed by trying to use the
“auto stick” function, if the vehicle while driving
does not allow you to select a specic gear, there
is a good change this is Limp In. There are many
other causes besides incorrectly programmed
ratio. A dealer scan tool will read the diagnostic
codes and this will explain to how x.
Transfer Case Programming Mode
Description: This mode allows the user to modify the
setting for the vehicle’s low range ratio. On vehicles with
A580 transmissions – it is imperative to correct function
that the vehicle’s computers match the actual ratio in the
T-Case when in 4WD-Low.
Notes:
• The programmed ratio must match the vehicle’s
actual transfer case ratio. The general rule for
factory vehicles Rubicons have 4:1, and non-
Rubicons have 2.72:1. If your vehicle shifts
properly in 4Low, the correct setting is already
programmed. You must change the transfer-case
to use this setting.
• A common option is to use Advanced Adapter’s
“ATLAS” T-case. It is imperative that only a t-case
with a single low range ratio be used in 2012+
automatic vehicles. A vehicle with the A580
transmission will not work with a dual low speed
case.
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