Question Differentials just changed with Mobile 1.. input??

[brianjbeach85]

Guys i just changed the front and rear differentials with Mobile 1 fully synthetic with "LS" addative in them. front differential took about 3 quarts of 75w 90.. and rear took about 4-5 quarts of 75w 140. anyone have any input on if this was a good move? or bad.. i dont really "haul" much never more than a 15k load if that. just looking for LONGEVITY.. trying to make the truck solid from engine to drivetrain to body.. whole 9 so to speak lol. I am doing the transfer case tomorrow with mobile 1 synthetic ATF... anyone know allen key size for plugs on transfer case while i am at it??

 

[WD40]

I think you will be fine. Synthetic run a little cooler.
Good Luck with them.
Doug

 

[JLDickmon]

don't try to extend the interval with synthetics.. it's just counterproductive.
take the better protection they give you and be happy.

 

[JimmyDee]

The rear end calls for synthetic. Probably because it works very hard and produces a ton of heat. For the other parts that you are changing, it will make them last a lot longer.
Jim

 

[brianjbeach85]

all the fluids are fully synthetic so i will continue to change them at interval, just curious if anyone has any real world experience about longevity.. example would be having a 6.0L with like 350k on it and having no issues with differentials or transfer case while using synthetics u know?

Thanks for input guys.. and i got held up other day because i was missing the 3/8 allen.. friggin transfer case plugs gotta be different than differentials..*sigh* all done tho!

 

[Crumm]

I have been running Mobil 1 in my differentials for 14 years. I only have 80k miles so it will be a while before I know muck about longevity. I do know the truck rolls much better at -40 with the synthetic.