Front Drive Shaft Installation

[IvDogg]

Hi all,

I recently picked up a 99' XLT 4x4.

I got it with the front drive shaft removed, the previous owner said he removed it to get better fuel economy.

1. Anybody have any quantifiable data on how much fuel is saved by removing the front drive shaft if any?

2. I would like to put it back in to regain 4x4 capability, what would be the best way to text the 4x4 shift system before I put it on if any? Or can I only test it with the drive shaft installed?

3. Anybody have any good references or 'how to's' for installing the front drive shaft? Is it fairly easy?

Thanks.

 

[mindgame]

If possible have the front shaft balanced first from a local shaft/spring shop that can do this prior to reinstallation.

Since the previous owner probably didn't place index marks on the shaft and couplers. I would just install it and listen/feel for vibrations as you drive and slowly increase the speed.

 

[IvDogg]

mindgame, thanks for the tip, but I if it's not that cheap I'm just gonna test it the hard way like you said.

Does anyone know how I can test my 4x4 controls before putting on the front drive shaft? I'd hate to install it just to find out the previous owner took it out 'cause something else was wrong with the 4x4 system...

If I turn my switch to 4x4HI without the drive shift to test if the system works will I damage anything? Should the notification come on in the instrument panel?

Thanks!

 

[bedrck46]

If possible try to contact the previous owner and ask him to be honest (which he may have been) and ask if there was any problems with the 4X4 system Its kind of too late but tell him you are planning to re-install the front shaft and just want to make sure before you do. Also let him know that you want to know so you can fix any problem that may have existed. Although you may be upset if you now find there were problems but don't act that way.

Then place the vehicle on blocks and re-install the shaft and slowly run it through A4wd 4H and 4L. You may want to check or change fluids also.

You should get the light to work on the dash If not then there could be an electrical problem or a problem with the shift motor

 

[bedrck46]

The following was copied from the service manual

Removal

1. WARNING: The electrical power to the air suspension system must be shut off prior to hoisting, jacking or towing an air suspension vehicle. This can be accomplished by turning off the air suspension switch located in the RH kick panel area. Failure to do so can result in unexpected inflation or deflation of the air springs, which can result in shifting of the vehicle during these operations.

With the transmission in neutral, raise and support the vehicle.

2.Remove the front driveshaft shield.
Remove the front driveshaft shield nuts.
Remove the front driveshaft shield.

3.Index mark the front driveshaft (4602) and the pinion flange.
Repeat it on the transfer case pinion flange to front driveshaft flange yoke (4866

4.Remove the front driveshaft.
Remove the four driveshaft slip yoke to transfer case bolts.
Carefully remove the front driveshaft.

5.Separate the front driveshaft from the transfer case.
Remove the driveshaft flange yoke to front drive axle pinion flange bolts.
Carefully remove the front driveshaft.

Installation

1.Follow the removal procedure in reverse order.

 

[mindgame]

mindgame, thanks for the tip, but I if it's not that cheap I'm just gonna test it the hard way like you said.

Does anyone know how I can test my 4x4 controls before putting on the front drive shaft? I'd hate to install it just to find out the previous owner took it out 'cause something else was wrong with the 4x4 system...

If I turn my switch to 4x4HI without the drive shift to test if the system works will I damage anything? Should the notification come on in the instrument panel?

Thanks!

You can shift it without the Front shaft.. I've done it many times Just keep the truck in park or neutral (with brakes on)..

 

[Expyguru]

Hope you have better luck bought mine with the front drive shaft out said the same thing. put it in and tranfer case chain was bad. The good thing is there easy to rebuild.

 

[skeeter9]

Hi, the truck is designed for AWD. Removing the front shaft may not have improved anything. Try going to the junk yard and pick up the front shaft. Should not cost much. Change the transfer case fluid at the same time as the shaft install. Check owners manual on fluid type, normally 2 quarts. This is the cheapest way out; hopefully no damage to transfer case.

 

[tonydiv]

If you're getting a junkyard driveshaft, it may not be a bad idea to take it to a driveshaft shop and have it checked for straightness, balance and the condition of the joints.

When that driveshaft goes in, you want to be sure that it is a 'known good' part. That way if there's a problem with the system, it's easier to diagnose.

 

[IvDogg]

Hi all, thanks for the feedback, I'll let you know how it goes, I spent this past weekend changing the oil pickup tube on my A4 (PITA!!! Had to hoist the engine and drop the sub frame in order to drop the oil pan!)...

Anyways, I have the original drive shaft (came with the car), and it looks like it's in pretty good shape... I have a few more things to do before I put the drive shaft back in... Ball joints squeak really loud, and the previous owner replaced the front tires with some used ones that are slightly smaller .

 

[mindgame]

Anyways, I have the original drive shaft (came with the car), and it looks like it's in pretty good shape...

Dude take the front shaft to Hawaii Spring Supply (Kalihi) for balancing before installing to make sure all is good.

 

[IvDogg]

Mindgame,

You got a ballpark amount for how much this should cost?

 

[mindgame]

Mindgame,

You got a ballpark amount for how much this should cost?

Sorry
Give them a call, they can give you an estimate..

 

[Snowboarder7710]

when i installed the lift kit for my f150, i had the front drive shaft balanced since it had to be reclocked , it cost me 30 bucks for the rebalance at a local drive line shop. shouldnt be much different from that.

 

[IvDogg]

So I finally got under there the other day to verify the front drive shaft install... Anyone know where I can buy bolts to get the drive shaft back on?

The drive-shaft is already bolted to the u joints on both ends, looking for the u joint to trans-axle and u joint to front diff.

Thanks.

 

[mindgame]

Anyone know where I can buy bolts to get the drive shaft back on?

Thanks.

I went to Honolulu Ford, and they sold me the correct 12 point bolt that was required long ago when I lost one because I forgot to put loctite..

 

[IvDogg]

I just ordered the bolts from a local Ford Dealership. For everyone's reference, part# N800594-S100 $3.32/ea.

 

[IvDogg]

Just updating, so I installed the drive shaft, 4 HI and Low work great, but...

When running in AWD on sharp turns I get that rough skidding feel as if it were in 4x4 HI or Low...

I read on another post somewhere that the wheel speed sensors may be faulty; since it can't detect the wheel speed AWD operates like 4x4 HI. My ABS warning light comes on after driving a few feet; that should be consistent with a bad speed sensor right?

If so, how do I find out which wheel?

 

[Chuy]

Hey just signed up to the forum, Thanks for all the info. I'm trying to reinstall the front driveshaft on my 98 expedition and this really helped. Just for anyone that may be going through the same thing just wanted to post some info:

I found the bolts at O'Reilly it's the Dorman HELP! brand part # 80992.

 

[hwy73]

You said the previous owner replaced the front tires with smaller ones. This could be causing the issue with the A4WD. The front wheels and back wheels are turning at different speeds. This is what causes the A4WD to engage.