99 & up 7.3L Power Stroke Engine and DrivetrainDiscussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.
When I am on the highway and I release my foot off the gas pedal, there is a jolt. The same holds true when I am changing gears and accelerating after it is engaged as if the driveshaft is catching up again. So I get under the truck and hold the output shaft from the transfer case to check my rear u-joints, and I have no play on those joints, but when I twist the driveshaft without holding the output shaft, I have about 3/4" of play. The play appears to be from the rear end of the transfer case. Is there some type of bearing in the transfer case where the shaft comes out and meets the rear driveshaft? I have read other posts on here with horror stories of the driveshaft falling off and FUBARing a lot of stuff back there. I appreciate your help, and hope that I have narrowed it down. Please help me confirm it!!! Part names and numbers would be greatly appreciated.
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2003 Ford F250 XLT SuperCab FX4 w/ Manual Hubs
185,000 miles on 7.3L Diesel w/ ZF6 Tranny
6" Lift on 35" BF's wrapped on Unique Bajas
AIS Intake; 4" Straight Exhaust
Last edited by abelsauceda; 05-27-2009 at 01:30 AM.
Thanks for the link, but do you know what may be causing that play in the output shaft? Is it a bearing? Is it something else in there? What part should I look for if I open it up? Do you know if there is a post or a write-up on taking apart the transfer case? Thanks!
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2003 Ford F250 XLT SuperCab FX4 w/ Manual Hubs
185,000 miles on 7.3L Diesel w/ ZF6 Tranny
6" Lift on 35" BF's wrapped on Unique Bajas
AIS Intake; 4" Straight Exhaust
That's exactly what I thought, but I just need to know what exactly to look for when I open up the transfer case... What is causing this play in my driveline? Does anyone know of a thread here with a write-up on a transfer case breakdown?
__________________
2003 Ford F250 XLT SuperCab FX4 w/ Manual Hubs
185,000 miles on 7.3L Diesel w/ ZF6 Tranny
6" Lift on 35" BF's wrapped on Unique Bajas
AIS Intake; 4" Straight Exhaust
When I am on the highway and I release my foot off the gas pedal, there is a jolt. The same holds true when I am changing gears and accelerating after it is engaged as if the driveshaft is catching up again. So I get under the truck and hold the output shaft from the transfer case to check my rear u-joints, and I have no play on those joints, but when I twist the driveshaft without holding the output shaft, I have about 3/4" of play. The play appears to be from the rear end of the transfer case. Is there some type of bearing in the transfer case where the shaft comes out and meets the rear driveshaft? I have read other posts on here with horror stories of the driveshaft falling off and FUBARing a lot of stuff back there. I appreciate your help, and hope that I have narrowed it down. Please help me confirm it!!! Part names and numbers would be greatly appreciated.
Take the driveshaft off and check the flange nut before you take it all apart.If the nut is loose you might get away with just replacing the flange because it is softer than the output shaft.
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2000 F350 srw pickup
3 in. leveling kit,35x12.5x16.5 BFG's,K&N air filter,4 in. exhaust from turbo back,Bully Dog boost,trans temp and exhaust temp gauges,Painless wiring inline module,Western Diesel four position chip(currently out being repaired),203 thermostat,Bully Dog shift kit.
I've got the same issue, but I can't tell if it's the transmission or transfer case. How did you determine it's the t-case and not a transmission problem?
__________________ 2002 F350 SRW 7.3PSD Crewcab LB 4x4, 6 speed manual, South Bend Clutch, 3.73LS, BFG All-Terrain T/A KO 295/75 R16 Tires, DiPricol gauges, Superchips 1705, AIS intake, MagnaFlow 4" exhaust, Power Slot Rotors with Hawk pads, 195K+ miles
Do you know if there is a write-up or exploded view of the transfer case so that I know exactly what the "flange nut" is? Thanks for your help!
The flange is the part that the driveshaft bolts to.If you unbolt the shaft you will see a big nut the holds the flange onto the output shaft.I have seen these nuts loosen and the flange start to wear on the spline of the shalf and become loose.If this happens the shaft is harder than the flange so you can usually get away with just replacing the flange and a new nut.
__________________
2000 F350 srw pickup
3 in. leveling kit,35x12.5x16.5 BFG's,K&N air filter,4 in. exhaust from turbo back,Bully Dog boost,trans temp and exhaust temp gauges,Painless wiring inline module,Western Diesel four position chip(currently out being repaired),203 thermostat,Bully Dog shift kit.
But I thought that the driveshaft was bolted on the rear end, and the other end where the splines are just slid into where that output shaft is... Am I not understanding?
__________________
2003 Ford F250 XLT SuperCab FX4 w/ Manual Hubs
185,000 miles on 7.3L Diesel w/ ZF6 Tranny
6" Lift on 35" BF's wrapped on Unique Bajas
AIS Intake; 4" Straight Exhaust
But I thought that the driveshaft was bolted on the rear end, and the other end where the splines are just slid into where that output shaft is... Am I not understanding?
You must not have slid under the truck and looked. Both outputs (front and rear) of the t-case are flanged, held to the output shafts with a nut. The driveshaft flanges bolt to them with 4 bolts each.
To answer your original question, there is a needle bearing just forward of the output flange. It's number 47 on the attached exploded view of your t-case.
I believe that the tail housing (#46) has to come off to replace that bearing.
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2002 F350 SRW 7.3PSD Crewcab LB 4x4, 6 speed manual, South Bend Clutch, 3.73LS, BFG All-Terrain T/A KO 295/75 R16 Tires, DiPricol gauges, Superchips 1705, AIS intake, MagnaFlow 4" exhaust, Power Slot Rotors with Hawk pads, 195K+ miles 
), AIS, 
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