need to know what weight gear oil

[mmbalala]

i just got an 05 fx4 but it didnt come with an owners manual i want to service my front and rear differentials but im not sure what weight of fluid to put in. also this truck seams to run about half way on the temp gauge is that normal for the 05 im used to my 01 running closer to the bottom quarter. not to mention this truck doesnt like to move till its warmed up all the way. my 01 didnt seem to care.

[topdwg]

As for the gauge that is where mine is, about half way, as for not wanting to move until warmed up, once again the same. Front and rear gear oil I run, REAR: 75W-140 and FRONT: 75W-110

Originally Posted by topdwg

As for the gauge that is where mine is, about half way, as for not wanting to move until warmed up, once again the same. Front and rear gear oil I run, REAR: 75W-140 and FRONT: 75W-110

Right on, Besure to put friction modifier in the rear. Temp guage is normal and if its sluggish on cold start get a reprogram. It should run like a raped ape cold.

[mmbalala]

thanks for the info on the fluid,theres got to be a reason this engine is so sluggish when cold. i love the extra power the 6.0 has over my old truck with the 7.3 but this 6.0 sure has some strange qwerks about it. maybe it is a program problem i know they made an adjustment in the computer to compensate for the 35" tires on the speedometer maybe they screwed up something in the program when they did that. once its warmed up it will pull anything i throw at.

[BlackPearlF250]

Originally Posted by mmbalala

thanks for the info on the fluid,theres got to be a reason this engine is so sluggish when cold. i love the extra power the 6.0 has over my old truck with the 7.3 but this 6.0 sure has some strange qwerks about it. maybe it is a program problem i know they made an adjustment in the computer to compensate for the 35" tires on the speedometer maybe they screwed up something in the program when they did that. once its warmed up it will pull anything i throw at.

its a safety feature so you dont screw your truck up when its not at operating temperature..