So this post may end up being a little wordy but I have a problem with truck "jerking" slightly when coming to a stop and under initial acceleration. It is not audible and doesn't occur every time I stop and go but when it does happen It's noticeable. Truck is a 00 250SD SC 2WD 6.8 v10 4R100 with 50,000 miles. I have checked u joints, driveshaft slip yoke, shaft bearing, brake slides, overall backlash, ring gear backlash and all appears to be ok. I put truck on lift and did what I could to duplicate suspension movement on takeoff and stops and didn't find anything binding or otherwise out of order which makes me lean towards problem with transmission or torque converter. Hard to describe but when it does act up truck feels like it has a full lockup or a car with a shift kit. Truck doesn't jerk into other gears or shift hard, just upon takeoff and stop and only every other stop or so. Looking for any input or advice from any members who may be experiencing this problem or have had a 4r100 fail and what their symptoms were prior to failure or if I'm even on the right track in leaning towards TC or trans. Thanks in advance for any input.

 

How did you check the slip joint? 99% of the time that's the problem.

 

I found that you have to take the slip joint apart to see if needs to be lubed. I had the same problem until I took it apart and lubed it.

Denny

 

x3 on the slip yoke

even if it feels fine by checking it with your hands, you should take it apart and grease it up. Ford uses a nickel coating on the splines and over time it wears off and starts making noise

 

For slip yoke all I did was visually inspect boot for rips/tears today. I don't have keystone clamp pliers or clamps to replace boot after I cut them off and have to have truck back together for work Monday. Do you know of any alternative to the factory clamps that a local parts store may carry? Also would you recommend re-installing the same boot? Mark I've read several of your posts concerning the 4r100 and was actually hoping my post would get your attention, appreciate the response. If I can find an acceptable alternative to clamp boot back on I will lube yoke tomorrow instead of waiting until the end of the week for a boot and clamps from dealership.

 

Tylus, RVpuller ,appreciate the reply.Did you guys use oem clamps on boot when you put it back together??If not ,what worked for you?

 

wire
hose clamps
one time I had some left-over Ford clamps from another project

just make sure the rubber is sealed tight and you leave slack so the slip joint can extend fully and not pull the rubber loose

 

I plan on lubing yoke and getting it back together tomorrow I will let you know results and thanks again for the input.

 

I'd recommend the ford grease (sorry, away from home and cant recall the name, its blue, 4 letters..), it seems to work better than standard wheel bearing grease or similar. Being careful, i was able to save and reuse the boot and clamp without any special tools, pia, but can be done.

 

Here is a write up I did last year...."Fixed it! I can’t believe grease made the difference. Got the 8oz tube specifically for this problem...driveline thunk from Ford. Cleaned off the freshly applied Mobil 1 red grease in the parts cleaner. Dried, inspected splines and gooped the entire 8oz of Teflon grease in the slip-joint. Re-used the Oetiker clamp. 200 miles later and like SuperDutyScaler said "silky smooth quietness". So thanks all!
(yes you can reuse the clamps. To get them apart bend the little tab vertical with a small flat blade and unwrap the clamp. Put the short end in a vice and pull apart or spread open the "Hat" made by the crimp tool slightly & gently using small vice grips. You don’t need much. Upon reinstallation wrap the clamp back around the boot insert the tab you bent and tap it back down with a small ballpeen. Be sure the other 2 or 3 humps ahead of the tab engage in their respective slots. Then recrimp, gently. I have the Oetiker tool so that made the recrimp easy). I couldn’t find the proper size (56mm) clamp in small quantities. Everyone wants to sell you a bag of 100 for $50. Ford wants $50 for their boot kit with 2 new clamps. So I saved a few bucks but more importantly the annoying clunk thunk on starts is gone...hopefully for the life of the truck!"
The part number is XG-8. Teflon (PTFE) grease. $8/8oz tube, one tube does the job, use all of it.

 

No more driveline clunk Not only did I get rid of driveline clunk, thanks to forum members I saved myself $42 by reusing boot and clamps. Also I didn't have to wait until next weekend to get job done on account of waiting on parts. As always I appreciate the input from all, this is not the first time that I have received time/money saving advice from members (i'm sure it won't be the last either!)

 

i used valvoline heavy duty crimson truck grease and hose clamps. been good for 2000 miles

 

Isn't the rec'd Ford grease basically a synthetic with PTFE thickener like Superlube ot Triflow grease? I used the later and it has worked well for me all winter. If I were to use anything else I'd at least look for something with moly, perferably a waterproof grease with aluminum complex thickener.