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just curious if mixing different types if chassis grease when lubing your ujoints matters very much. last time I lubed them with an all purpose grease that looks like vaseline but wanted to try some blue hi temp stuff we had at work this time. can I just pump the new stuff in the ujoints till I see the new color coming out or do you have to take them apart and clean them first?
 

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Man, if you have to take them apart and clean them every time you grease I'd be like screw this I'm buying a horse!!!
 

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Just keep pumping until you see the new stuff coming out. Thats also the best way to lube the u-joints so you remove all the dirt that may have built up.

Remember that you still need to be sure that both types of grease are NLGI-2 compatible.
 

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The main thing is that you greased them, I wouldnt be to concerned with grease compatibility, like someone else said, run new grease until you see old grease coming out.
 

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There is a Service Bulletin that requires about 2/3s of the lube points on the truck to be greased with "multi purpose" grease while the remaining joints including the double cardan joint get "molybdenum disulfide lithium base chassis grease, NLGI No. 2"

I looked at buying a second grease gun and two cartridges of grease. After I found the fancy stuff after stopping at several parts places I decided to just put the fancy stuff in all of the driveshaft lube points. Local parts guy said the stuff I bought would work great in any application.
 

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ByrdDog20 said:
There is a Service Bulletin that requires about 2/3s of the lube points on the truck to be greased with "multi purpose" grease while the remaining joints including the double cardan joint get "molybdenum disulfide lithium base chassis grease, NLGI No. 2"

I looked at buying a second grease gun and two cartridges of grease. After I found the fancy stuff after stopping at several parts places I decided to just put the fancy stuff in all of the driveshaft lube points. Local parts guy said the stuff I bought would work great in any application.
The fancy stuff you found is moly-based. Moly is an excellent wear inhibitor. It's even in amsoil motor oils. Using that instead of regular multi purpose is fine.
 

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Copied my post from the other thread:-

The important thing is not to mix greases of different bases. Some different bases can be mixed to differing extents, but others are incompatible. The base (eg lithium) is the type of wax used to make the grease not be a liquid. Probably easiest way is to just not switch greases around but always stick with the same. Two automotive types that can be mixed (but not preferred) are lithium and lithium-soap. Two that can't be mixed are lithium and aluminum high temperature.


Additional:- Molybdenum disulphide is is not part of the wax base, it is an added powder that smooshes to provide protection under "extreme pressure", hence it makes an EP grease.
 
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