I have a 96’ F-250 with the Dana 50 TIB suspension, 351, E4OD, Manual Hubs, and T-case.

It recently snowed here and I needed to use my 4x4 to get out of the ski parking lot. I lock my hubs and put my manual transfer case into 4x4 high. I got out just fine, and when I got on to the highway switched the transfer case to 4x2. Then latter on the road I, when I got up to 60 mph I started to hear a loud clunking sound. I pulled over, unlocked my hubs and started on my way again. I shifted the transfer case in to 4x4 wile moving as a test, no noise.

Does this mean I need to replace my hubs?
Was it because the hubs were in while driving in 4x2?
Is there some tests I could do to the truck while on Jack stands to make sure it's one/both of the hubs?

Any info would be great.

Lou Smith

 

i would try putting it in 4 low if the front driveshat doesnt turn then you might have broken the chain in your t-case.

 

I put it 4 high, it got me out of a foot of snow...

 

Might check the front axle u-joints also.

 

Hi Lou,

TSB 97-13-22 talks about your problem.

This is what it says...... (Reader's Digest version)


LIGHT TRUCK: 1987-96 BRONCO, F-150, F-250 LD
1987-97 F-250 HD


This TSB article is republished in its entirety to include 1996 and 1997 model year vehicles.

ISSUE:
A driveline vibration or noise may occur when driving a 4X4 truck at highway speeds in a 4X2 mode with the front drive hubs locked. This can occur if the driveline angle is incorrect.

ACTION:
Replace the front driveshaft with one that has a double cardan joint at the transfer case and a compatible companion flange for the transfer case. Refer to the following Service Procedure for details.

PART NUMBER PART NAME
F1TZ-4A376-A Driveshaft Assembly - All M5OD Transmissions - ZF Transmissions With 4.9L Or 5.8L Engines
F1TZ-4A376-C Driveshaft Assembly - All C6 And T18 Transmissions - ZF Transmissions With 7.3L(D) Or 7.5L Engines
F1TZ-4A376-D Driveshaft Assembly - AOD Transmissions
F1TZ-4A376-B Driveshaft Assembly - E4OD Transmission - All Engines
E7TZ-7B214-C Front Output Yoke - 1356 Transfer Case
E1TZ-7B214-D Front Output Yoke - 1345 Transfer Case
F5TZ-7B214-B Front Output Yoke - 4407 Transfer Case
E1TZ-7C016-A Front Dust Slinger - 1345 Transfer Case
45338-S2 Nut - 5/16"-18 (Hex With Captive Conical Washer) (4 Req'd.)
385883-S100 Bolt - 5/16"-24x1.25 (Double Cardan Driveshaft) (4 Req'd.)
D3AZ-4529-C U-Bolt - Universal Joint (Driveshaft-To-Axle) (2 Req'd.)

 

transfer is fine , if you broke the chain the truck woud'nt move sounds like a u jount in a stock truck i woud not worry about driveline angles