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Lennart 05-16-2006, 10:12 AM When looking at several tables (e.g. D5002) in the Allison tuning I see a Pattern C called "4WD lo"...since the shift speed is rather close to the normal or T/H I assume it does NOT mean you are running in 4WD LOW.... Please help me understand this one... Lennart 05-17-2006, 01:15 PM Anyone? lakingslayer 05-17-2006, 05:22 PM That table is used when running in 4LO. a78turbo 05-17-2006, 06:03 PM Trans will see same speeds, just reduced in the transfer case. Input and output of the trans speed sensors will read the same in high or low. Brayden 05-23-2006, 05:21 PM Trans output speed sensor is on the back of the T-case.. So it sees the reduced speed. If the output speed sensor were on the adapter housing then your statement would be correct. YellaCat 05-23-2006, 05:40 PM I would say the ali never sees Patern C or there is an error somewhere. Any chance there is another speed sensor before the tc? Brayden 05-24-2006, 09:38 AM No.. There are three.. Input, which picks up engine speed at the torque converter. Turbine which picks up turbine speed. And then ouput which picks up output shaft speed. Lennart 05-24-2006, 10:50 AM Does that mean if I had a switch parallel to the 4low activator I could run a 3rd programming option without actually being in 4low? Brayden 05-25-2006, 09:39 AM No.. because it would be expecting to see the 2.72:1 reduction occurring.. But since you fooled it, it wouldn't have shifted, and still have a 1:1 ratio and then you're PCM would think there is something wrong with the T-case actuator.. Because it never made the range change. :D Most of these systems are closed loop and hard to fool. | ||