SAS with autotrac

[pauly383]

OK, I spent the last 2 hours reading everything I could find on internet. Well it seems the case does have a 2wd position and it locks out the front. Seems the reason people are changing out the transfercase is that the autotrac NON cv front shaft does not work well with lifts at speeds over 25 mph when in 4wd. Well at least I learned a lot about newer trucks today. /forums/images/graemlins/k5.gif

 

[rjfguitar]

[ QUOTE ]
OK, I spent the last 2 hours reading everything I could find on internet. Well it seems the case does have a 2wd position and it locks out the front. Seems the reason people are changing out the transfercase is that the autotrac NON cv front shaft does not work well with lifts at speeds over 25 mph when in 4wd. Well at least I learned a lot about newer trucks today. /forums/images/graemlins/k5.gif

[/ QUOTE ] That is what I was thinking the same thing and that is why Custom lift companies like Whiplash and Fullthrottle suspensions specialize in huge IFS lifts. They sell custom autotrac front shafts for like $450 or so.

I see no difference with having an IFS or D60 in the front, the T-case can't tell. /forums/images/graemlins/dunno.gif

 

[bluejeep]

Just had my dad check on his pushbutton 4wd '96 Chevy and he said the transfer case is a NP 243G.

I understand that there would be vibrations with the autotrac when used with a lift/solid axle, especially if the pinion angle wasn't set correctly. What I don't understand is why it wouldn't work if it WAS set up correctly (pinion at transfer case with CV, or pinion parallel to transfer case output with non-cv).

If used correctly, I don't see why it couldn't be a nice feature....ie. in winter with hubs locked in use autotrac when in inclement weather, otherwise use as a normal transfer case, 2hi, 4hi, 4lo. Kinda like the old IH Scouts that had the auto-manual hubs. If the transfer case itself is significantly weaker this is something to consider, but is there some other reason it should not be used??

 

[6.2Blazer]

My dad really liked the autotrac option in his '01 1500 and used it all of the time in the rain and snow. When he traded it in for an '02 2500HD he couldn't find one with the autotrac option on the lot anywhere, but he wishes he still had it. The autotrac option seems very common on the new 1500's, but very few 2500HD's seem to have it.....when I was shopping for my '03 2500HD only one out of about 20 of these trucks I found on various lots had the option, though almost every 1500 did have it.

 

[rjfguitar]

[ QUOTE ]

If used correctly, I don't see why it couldn't be a nice feature....ie. in winter with hubs locked in use autotrac when in inclement weather, otherwise use as a normal transfer case, 2hi, 4hi, 4lo. Kinda like the old IH Scouts that had the auto-manual hubs. If the transfer case itself is significantly weaker this is something to consider, but is there some other reason it should not be used??

[/ QUOTE ]
Same here. the t-case doesn't know the difference between a solid axle and IFS. There are no sensors up front that corrospond with the autotrac feature. It seems to me everything would work fine inlcuding the autotac feature. /forums/images/graemlins/dunno.gif