Inner CV Joint Grease

[Fitz98]

I want to take my junk yard axle boots off and re-lube the CV axles for my 2004 Nisan Sentra and inspect before re-installing them.
@ Trav recommended Schaeffer 219 (with the red cap, not the yellow cap)
I am not seeing the red cap one on their website, or anywhere else for that matter.
It appears as if he has already invested a lot of time into researching this and seems to recommend the red cap 219 for most inner cv joint posts, but I can't find it.
I have also looked at GKN and they have outer boots and grease for my axles, but nothing for inner boots or grease for my axle.
I am probably overthinking this, but don't want to make more damage trying to do the right thing, but for peace of mind, I would love to re-lube and inspect, rather than just assume the joints are good because the boots are still good and not showing signs of wear or leaks.
Recommendations?

Also, looking to lube the U Joints on my 03 Suburban. Does this require anything special or just regular bearing grease?

 

[ripcord]

U joints are fine with common lithium complex grease. 3% moly is good for those.

For CV shafts I would leave them alone if the boots are in good shape. If you do want to regrease, buy a boot kit that comes with specific grease for your application. Inner and outer joints often use different grease, btw. Black, high moly grease is typical for the outers.

 

[Sequoiasoon]

If they move the same way, why would there be different greases for inner and outer joints? I'm thinking like old school U-joints with zerk fittings. What was in my gun was used.

I juts went through a lot of BS with CV axles on my sons car ('10 Forte). Kia discontinued them, non available. The aftermarkets don't have weighted damper and have their own vibration at highway speeds at least in his particular vehicle. We tried 2 different aftermarket brands with same issue.

I got used from car-part.com and asked shop to check joints, regrease, reboot. They said no boots available. They threw in what I bought with 87k on them. Car is smooth so I'm happy, hopefully it stays that way. His original had almost 200k on them when they went bad. The used one has 87k.

 

[Arc]

They don't need new grease unless the seal was broken.

 

[Kestas]

CV joints require a specific grease for the application. Off the shelf Grade 2 wheel bearing grease is not appropriate.

CV joint grease needs to contain a lot of antiwear additives. The CV joint experiences sliding motion, micromotion, and fretting, and needs a lube that protects under these conditions. It also needs to be resistant to heat for inner CV joints for FWD cars, where they operate close to a heat source.

The application is also sensitive to viscosity. It needs to maintain a fine balance. Too high a viscosity and the lube won't creep into the surfaces where lubricant is needed... too low a viscosity and it'll run out. And the lube needs to be shear stable because it can get sheared down rather quickly in application.

 

[martinq]

I keep stock of Red Line CV-2 grease just for this purpose. I'm sure the GKN greases are great but price and availability is not great.

https://www.redlineoil.com/cv-2-grease

https://www.redlineoil.com/Content/files/tech/cv-2_grease_prod_info.pdf