Fabtech's Front Diff Mounting System
 

Since I've installed the lift, I've noticed under load in 4wd that the front diff rises a matter of INCHES easily visible. What is the reason for this?

The reason I ask; this weekend I was out snowboarding and a darn blizzard was making it hard on me and my bald mud grapplers so I had to put it in 4wd. Upon doing so I got a repeated clank in the front. I got out and had a friend drive to identify the issue. It appears that the base of the front diff is tilted toward the FRONT OF THE TRUCK. It looks like this is causing unsatisfactory angles for the front driveline and causing it to bind up. I am surprised it did not brake. It was a less than funny situation trying to make that trip in 2wd on bald tires.

I sent an email to the engineer team at Fabtech, hope I receive a reply.

Anyone know the correct orientation of the front diff, it's always seemed to tilt but from what I remember it tilted the opposite way to IMPROVE the angle of the front driveline.

my question is why is the front diff even able to move? i know that mine cannot move, 2 mounts on the top and then 1 point attaches to the subframe. it isn't loose is it? sounds weird?

sounds like something is broken to me...i have seen the very top diff mount brake out of the frame on a few 04s infact there is a TSB on it.

TSB
06-11-12 4X4 FRONT DIFFERENTIAL BRACKET REPAIR

Publication Date: June 2, 2006

FORD: 2004-2006 F-150
LINCOLN: 2006 Mark LT


ISSUE:
Some 2004-2006 F-150, 2006 Mark LT 4X4 vehicles may exhibit a concern of the left hand front differential mounting bracket separating from the frame rail.

ACTION:
Follow the Service Procedure to correct the condition.

SERVICE PROCEDURE

To service, install left front differential mounting bracket. Refer to the instruction sheet included with the Front Differential Bracket Kit.

NOTE: THIS TSB DOES NOT APPLY TO 2004 F-150 HERITAGE VEHICLES.



PART NUMBER PART NAME
4L3Z-5097-KB Front Differential Bracket Kit



WARRANTY STATUS:
Eligible Under Provisions Of New Vehicle Limited Warranty Coverage

OPERATION DESCRIPTION TIME
MT061112 Claim Labour As Actual Time Actual Time

DEALER CODING
BASIC PART NO. CONDITION CODE
5005 01

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Copyright © 2006 Ford Motor Company

yeah something sounds broken

Did you go look and see if something is broke?