Slight slack in drivetrain - Ford Powerstroke Diesel Forum
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Old 04-23-2013, 09:24 AM
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Slight slack in drivetrain

2005 F350 KR CC SB 6.0. I've been noticing a little slop/slack/play when I press the go pedal from stops. It's not a ton of slack at this point, and there's no popping, clunking or vibrating at any speed but my truck has nearly 149,000 miles on it. Is it U joint time or is there another potential issue here?

It shifts great and my limited slip works as well as a Ford LS could/should with this many miles from what I've read. Not a huge issue at this point but I'd like to nip this in the bud before it becomes a more serious issue.

Thanks all.
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Old 04-23-2013, 12:03 PM
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Crawl under the truck and see if you can move the driveshaft back and forth by hand. If there is slack it could be your u joints if there's none maybe the tranny slipping a little may need to flush tranny and put new fluid in. I have an 06 f350 and my driveshaft is thought no play at all and I have 161,000 on it. So start with the easy an go from therr


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Old 04-25-2013, 02:55 AM
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Pull the drive shaft and grease the slip joint, simple fix.
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Old 05-30-2013, 04:18 PM
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Quote:
Originally Posted by jsm180 View Post
Pull the drive shaft and grease the slip joint, simple fix.
meant to get back to this sooner. sorry for the delay. Could you be more specific? I pretty well know my way around the engine now after replacing a piston and doing virtual rebuild as a result but the drive train is another story.

I climbed under the truck and I can move the drive shaft quite a bit at the carrier bearing but don't know if that's normal or not. What do you mean exactly by the slip joint? I'll look into it more on the forums but thought I'd ask here first.

There's no "rotational play" in the DS at this point though. Thanks guys
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Old 05-30-2013, 08:59 PM
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There is a splined slip joint in the back part of the driveshaft. Disconnect the shaft from the rear end and pull the rear part of the driveshaft out. (I would mark where it goes) grease the splines. (Not to much as it makes it hard to reinstall) reconnect the driveline and that may fix your problem.


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Old 05-31-2013, 04:22 AM
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Originally Posted by michaelbyoung View Post
There is a splined slip joint in the back part of the driveshaft. Disconnect the shaft from the rear end and pull the rear part of the driveshaft out. (I would mark where it goes) grease the splines. (Not to much as it makes it hard to reinstall) reconnect the driveline and that may fix your problem.


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Well I got it greased up last night. (note to self: set E-Brake or put in 4wd before disconnecting driveshaft from rear end)

It helped a little but not much. I think the culprit is the carrier bearing. I went to clean off some dirt with my finger and the rubber that the dirt was on came off with it.
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Old 05-31-2013, 04:16 PM
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My carrier bearing was bad on my last truck, and I changed it first, it helped a little but the slip joint was the worst. Hope changing your bearing gets it right. When I was having my issues I thought for sure it was my rear end, but those two things did the trick. Good as new after that.


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Old 06-03-2013, 04:33 PM
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Quote:
Originally Posted by michaelbyoung View Post
My carrier bearing was bad on my last truck, and I changed it first, it helped a little but the slip joint was the worst. Hope changing your bearing gets it right. When I was having my issues I thought for sure it was my rear end, but those two things did the trick. Good as new after that.


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mine ended up being the exact opposite. I greased the slip first and still had plenty of noticeable slack. Changed the carrier bearing last night and it's back to good. Actually acts like my truck wants to raise her front end now that the driveshaft isn't trying to arch!

Thanks for all the help guys!
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