Supposedly bofer, a coastable automatic is rare and our truck is not one. I was warned about this before. In other words, it's not safe nor wise to coast in neutral but I used to do it all the time as the RPM's drop significantly when coasting to a stop sign, big gas saver. I don't exactly buy it but I thought I'd throw it out there.

 

in the transfer case in an F-150. Either the front prop shaft is engaged, or it isn't. No mechanism to allow slip or the shafts to turn at different speeds, that's why you cannot run in 4hi or 4lo on dry pavement.

This is different from the old full-time 4wd trucks of 1973-1979 vintage, where the transfer case had a differential to allow the two axles to travel at different speeds, thus could was driving both axles all the time. Hell on gas mileage and front tires, though.

 

No kidding!! My dad had a '73 full time that my brother and I used to go to work framing houses. Had 70 gallons of gas tanks and Parnelli Jones baja tires on it. I think it was 90 miles round trip, Pasadena to Mission Viejo. That truck got 8 m.p.g.. Between the tires and gas, we didn't clear much at the end of the week!

 

my iwe on the driver side is bad. (I isolated it and it won't take any type of vacum). and my hub and iwe on the passenger side are shot. I asked in another post if anyone knew what ford changed in nov of 04. cause there are different part #.


second question. I used to put my front tires on a gravel pile , have my wife gas it alittle and look underneath. only one axle would rotate. so do we have a slip in the front differential???

 

The front diff is not limited slip. You would have a hard time making a turn if it was LS.

 

so it is a full floating slip

 

As far as I know it is just a plain open differential up front.

 

Yes ALL front F150 axles are open differential from the factory.....but i have a question.....i know it was stated that it would be hard to turn with an L.S. diff or locker up front....but wouldnt that only be the case if 4WD was engaged?

 

I'd say you'd have to be in 4wd to have the diff try to lock up, since I think it's the torque on the pinion that causes the diff to rotate, and, in the case of a LS, to lock up or at least spin less. But I'm not a mechanic, just my thoughts.

 

are there aftermarket limited slips for the front??

 

There is a Detroit True-Trac, it runs about $450 for the rear, not sure about the front. If you want the SVO Ford trac Lock, it's a Ford Differential, it's only $200 or so and you can put that on the front, but it has clutch packs that would wear out, I don't think the TrueTrac runs off clutchpacks so it should never lose its strength. Went wheeling today, have some video, maybe I'll post it if someones interested.

 

Getting back to the original question does anyone have pictures or a detailed assembly explaining how these thing work.

I am having problems with mines engaging so if I could see exactly how they work maybe I could figure out what is wrong with them.

Thanks

 

Post it.

 

I would be very surprised if you find any. I believe they are only sold as a unit. Non-rebuildable.