I have a 97 F150 ext cab Lariat 4x4...I have the turn **** on the dash for the 4 wheel drive. Is it safe to flip in 4x4 on the fly? or do I have to be stopped? My dad says its not safe, and some other people say its fine...

 

Read and follow the instructons in the owners manual as this is how Ford recommends shifting the transfer case.

 

All the 4x4 F150s I have owned since 83 are shift on the fly (as long as hubs are engaged, which you don't have to worry about). Also that is for 4hi, not 4lo. 4lo requires stopped, foot on brake, and in neutral. Speed limit on shift on fly is usually 50-55.

If you don't have a manual, you can download one from www.motorcraftservice.com, in the owners section.

 

Here's a more direct link to dl a Ford owner's manual.

 

alright thanks guys. I downloaded that owners manual, and it says its fine up to 55 mph and as long as the tires aren't spinning...thanks ya'll for the information.