Ok guys, just wanted to chime in on this topic. Since day one, I've had the "bump" issue even though I am vigilant about greasing my drive lines. My issue was two fold, I get a slight bump when I come almost to a stop and when I release the brakes it "bumps." Another is after coming to a complete stop and then releasing the brakes I got the "bump." Almost like pressure building and then releasing but not quick enough, hence the bump. Obviously from the slip yokes.
I've ready numerous threads on what kind of grease to use...yada yada yada. Based on my research, I decided to use Mobile 1 Synthetic (red) as a coverall for the whole drive line. The bump was now intermittent. Fast forward to last night, I decided to follow the FSM and use moly grease on the slip yokes and continue to use Mobile one the u joints. Guess what..."bump" is 100% gone!!!
While pumping the grease into the rear slip yoke, I noticed something I've never seen before when I used the Mobile 1, the moly grease was now seeping through where the slip yoke and drive line meet allowing it to easily contract and expand. My theory is that the Mobile 1 grease caused a vacuum seal that would not let the slip yoke move as much. It's just a theory. However, I do know for certain that as of right now the annoying bump is gone. BTW, someone on the Tundra forum wrote that moly infused grease is specifically made for metal on metal contact, which makes sense for the slip yokes.
Ok guys, just wanted to chime in on this topic. Since day one, I've had the "bump" issue even though I am vigilant about greasing my drive lines. My issue was two fold, I get a slight bump when I come almost to a stop and when I release the brakes it "bumps." Another is after coming to a complete stop and then releasing the brakes I got the "bump." Almost like pressure building and then releasing but not quick enough, hence the bump. Obviously from the slip yokes.
I've ready numerous threads on what kind of grease to use...yada yada yada. Based on my research, I decided to use Mobile 1 Synthetic (red) as a coverall for the whole drive line. The bump was now intermittent. Fast forward to last night, I decided to follow the FSM and use moly grease on the slip yokes and continue to use Mobile one the u joints. Guess what..."bump" is 100% gone!!!
While pumping the grease into the rear slip yoke, I noticed something I've never seen before when I used the Mobile 1, the moly grease was now seeping through where the slip yoke and drive line meet allowing it to easily contract and expand. My theory is that the Mobile 1 grease caused a vacuum seal that would not let the slip yoke move as much. It's just a theory. However, I do know for certain that as of right now the annoying bump is gone. BTW, someone on the Tundra forum wrote that moly infused grease is specifically made for metal on metal contact, which makes sense for the slip yokes.
I will try this this weekend. I usually follow the service manual exactly but was too cheap to buy a second grease gun and lube. I hate that mobil 1 stuff though, it leaked a huge amount of red "juice" out of the grease gun all over my garage.
I will try this this weekend. I usually follow the service manual exactly but was too cheap to buy a second grease gun and lube. I hate that mobil 1 stuff though, it leaked a huge amount of red "juice" out of the grease gun all over my garage.
I know, the red liquid from my Mobile 1 grease gun is everywhere. I just bought a mini 3oz grease gun from Amazon for 16 bucks for my moly grease and it works great.
Here's two videos of how I fixed my sleeve yoke binding problem. Well, at least it's been fixed for around 900 miles so far. The thread I started is actually named wrong though. The correct term is "Sleeve Yoke". I just couldn't rename my thread without deleting it.
__________________ "My old man is a television repairman, he's got this ultimate set of tools. I can fix it!"
Ordered Moly lube yesterday and a second grease gun to make life easier.
I wish I'd been hotter on this early on in my truck owning carear!
I also had to replace a zerk fitting... supprisingly easy, I've had a nighmare with stud extractions in the last, but as these are... kinda my nature all greased up it came out really easily!
The best bit is on a lifted truck you don't even need to jack the thing up!
Ok guys, just wanted to chime in on this topic. Since day one, I've had the "bump" issue even though I am vigilant about greasing my drive lines. My issue was two fold, I get a slight bump when I come almost to a stop and when I release the brakes it "bumps." Another is after coming to a complete stop and then releasing the brakes I got the "bump." Almost like pressure building and then releasing but not quick enough, hence the bump. Obviously from the slip yokes.
I've ready numerous threads on what kind of grease to use...yada yada yada. Based on my research, I decided to use Mobile 1 Synthetic (red) as a coverall for the whole drive line. The bump was now intermittent. Fast forward to last night, I decided to follow the FSM and use moly grease on the slip yokes and continue to use Mobile one the u joints. Guess what..."bump" is 100% gone!!!
While pumping the grease into the rear slip yoke, I noticed something I've never seen before when I used the Mobile 1, the moly grease was now seeping through where the slip yoke and drive line meet allowing it to easily contract and expand. My theory is that the Mobile 1 grease caused a vacuum seal that would not let the slip yoke move as much. It's just a theory. However, I do know for certain that as of right now the annoying bump is gone. BTW, someone on the Tundra forum wrote that moly infused grease is specifically made for metal on metal contact, which makes sense for the slip yokes.
I took my sleeve yoke apart and greased it really well with moly grease and it didn't get rid of my sleeve yoke binding problem. When I cleaned it up and greased it with Ford XG-8 grease, the problem finally went away. Maybe my sleeve yoke is more worn than yours from improper or no greasing over it's life.
The Ford XG-8 was manufactured to directly address the slip yoke and sleeve yoke binding problems with their trucks. And since drive shafts are drive shafts, it works great for our trucks too.
I took my sleeve yoke apart and greased it really well with moly grease and it didn't get rid of my sleeve yoke binding problem. When I cleaned it up and greased it with Ford XG-8 grease, the problem finally went away. Maybe my sleeve yoke is more worn than yours from improper or no greasing over it's life.
The Ford XG-8 was manufactured to directly address the slip yoke and sleeve yoke binding problems with their trucks. And since drive shafts are drive shafts, it works great for our trucks too.
I know for a fact the dealer doesn't use different grease on the driveline. They use the same throughout. I watched the master tech do my 15' 4Runner.
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2015 T4R TRD Pro in super white, Morimoto 4300K HID kit, Auer Engineering / Toyota LED DRL/Fogs 2-in-1's, TRD drop in air filter, WeatherTech front and back liners.
2002 T4R SR5 4WD Onyx Black Sport Edition w/Leather. Gone but not forgotten.
Weird that as per the TSB, Toyota's most recent recommendation is to use MP grease on all joints except for the double cardan which is moly. Isn't a double cardan joint just two U-joints? How is it different in construction vs a U-joint to require (in theory) a different grease?
It seems the reason why Toyota initially specified two greases is because of the presence of sliding vs rolling forces. Rolling forces are better serviced by a (NLGI GC rated) MP grease and sliding forces by a (NLGI LB rated) moly grease. However, these days greases have become so good that most moly and MP greases are both GC and LB rated, so it might not really matter. All the old school guys saying moly greases ruined their U-joints were probably basing their experiences on ancient greases which did not perform the same in these two applications as compared to a modern grease.
I'm curious why Toyota would switch from a moly to a MP grease for the slip yoke when sliding forces are better serviced by a moly grease.
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