Hi there,
I still have problems finding a suitable 4wd T42 TCM tun file for my 2007 LMG (E38)4L60E (T42) drive train.
Today I tried some different T42 .tun files. Now it is even more strange to me.
I have three different tun files. One 2wd (OS 24235341 cal 24234634)
and two 4wd (1st OS 24235341 cal 24233141 2nd OS 24239036 cal 24237445) ones.
One 2wd and one 4wd even have the same OS. I compared them with EFIlive and they are 100% the same. Isn't that strange?
The other 4wd ( 2007 Silverado) has a slightly newer OS.
First I corrected the speedo seetings ( now possible with the new EFIlive update) in all tun files and then I tried a full flash with the first 4wd file. No success, no part throttle shifts, no downshifts. Then I tried the second 4wd tun file with the newer OS.. full flash.. and the same as before, a strange acting tranny.
Last thing was going back to the 2wd tun file ( this is actual the one my T42 came with..) and with that tun file the tranny shifts as it should.
For me it seems, as soon as I load a 4wd tun file something goes wrong??
Could there be some mixed up wiring ?? I don't remember a TCM connection which has something to do with the transfercase ? The only signal is the 4wd low signal to the ECM and that is wired correct.
So far I can use the 2wd tun file, I have 2hi and 4hi but 4low doesn't work, the tranny doesn't shift at all, except when the rpm reaches the limit.
Any ideas?
Harald