Grease for driveshaft slip yoke splines?

[headhunter38]

I am replacing the carrier bearing on my 1994 f350 crew cab with 2 piece drive shaft. I want to add some fresh grease to the splines. I have read before about Ford slip yokes needing special grease, specifically the motorcraft xg8 ptfe grease.
However the original grease looks and smells like moly grease. Also everything I have read pertains to powerstroke trucks not idis. I have also seen that the powerstroke driveshaft splines have one larger spline which may be the cause of the binding issues. The idi splines(at lease on mine) are all the same size and maybe dont have the binding problems as evidenced by my Google searches not resulting in anything specific to our trucks.
Am I over thinking this? If I hadn't previously read about this and been aware of it I would probably just be using moly grease lol.

 

[Clb]

Realize that the mfg often quotes "only use" my product....
Clean and of the same family would probably be fine.
I miss powersmoke the oil engineer we had.

 

[headhunter38]

Realize that the mfg often quotes "only use" my product....

Agreed. Most of what I have read has been forums though.

Clean and of the same family would probably be fine.

Ill probably be doing that.

 

[u2slow]

right or wrong, i typically use moly-slip. no disasters to report.

 

[Nero]

Grease is grease. I switched mine out for hi TAC red valvoline when I rebuilt my driveline 30k ago, and use is 90% of the time with camper or towing... Zero issues...

 

[Black dawg]

If the splines have the blue stuff on them most any grease will do. Stickier seems to be better.
Where that ford grease shines is un coated metal splines.

 

[DaveBen]

Please mark the position of the slip joint so you can put it back the same way it came out. If you get the driveshaft out of phase it will shake.

 

[u2slow]

Please mark the position of the slip joint so you can put it back the same way it came out. If you get the driveshaft out of phase it will shake.

I have always encountered a master spline, so it only goes back on at one particular clocked position. I can't say for sure they are all like that.

 

[DaveBen]

My 1992 F-350 was not Keyed and I put it together out of phase and it SHOOKED until I got it phased.

 

[headhunter38]

I have always encountered a master spline, so it only goes back on at one particular clocked position. I can't say for sure they are all like that.

They arent. Mine looks to be the original driveshaft and there isn't a master spline. It has a dana sticker on it though so maybe not. Not sure if the originals were dana shafts.

 

[u2slow]

Dana/spicer series ujoints mean dana/spicer shafts.

edit: to be clear, dana/spicer end yokes on the shaft that use 1330, 1350, 1410, etc ujoints.

 

[Willey 3]

Years back my 91 350 developed a driveline issue requiring a new yoke assembly. Using the usual red grease, something clunked into gear ( 5 speed) used the Ford PTFE and after a short time resolved it. It is basically Teflon. Quite different than grease. Comes in a small tube, not sll that pricey, and can be used in other applications.

 

[franklin2]

Grease is grease. I switched mine out for hi TAC red valvoline when I rebuilt my driveline 30k ago, and use is 90% of the time with camper or towing... Zero issues...

Be careful saying that. For example you have wheel bearing grease which is much thicker than chassis grease.
We were also where I work using a lubriplate white grease in a high speed bearing application. The bearings kept going out. That is when we noticed when we took them apart, there was a black paste in the bearing and then a oily substance in the rest of the bearing. Come to find out, the grease we were using was not rated for high speed and was separating. We changed to a better performance grease, no more bearing problems.

 

[Nero]

@franklin2 you are 100% correct. To clarify, I use valvoline red hi temp for my wheel bearings and u joints.