when our transfer case is in 4lo will auto trannys shift through gears??

 

It will. The transmission doesn't know which gear the transfer case is in. The transfer case in 4Lo just does a large gear reduction after the transmission..

 

thank you.my truck feels like its in 4lo and its not my tranny wont shift out of first and my transfer case is so stiff i pulled the **** off

 

Crawl under and check out the t-case linkage. Could be stuck. They have that issue sometimes. Lube it up good and try to free it from under the truck if you can.

 

i understand it can bind up but would it do that going down the road at 65-68 mph???

 

The shift points on the automatic are based on the VSS in the rear end, not the RPM. There is a switch on the transfer case linkage to tell the PCM that the transfer case is in low range. This moves the shift points down.

If the switch malfunctions, the shift points will be messed up.

 

The PCM may know (and alter the shift points), but the transmission doesn't. Not all 4WD vehicles do this. If the switch you refer to malfunctions, the PCM thinks the tcase is still in 2H or 4H, and the shift points remain the same, the transmission should still shift as the rpms build up. The shift points changing as you state are to prevent over-reving. The OP stated the transmission was not shifting.

ETA: OP's profile shows a 1997 F250...anyone know what year the VSS was implemented?

 

Transmission shifts are under control of the PCM. The E4OD won't do any form of shifting on it's own since there is component for it to tell RPM, in or out. This isn't a C6...

If the PCM is getting a valid VSS, it won't upshift to second until the speed is high enough.

 

Any truck with a 10.25 or 10.5 rear end should have one...