Could it be a lack of friction modifier?

EMD_DRIVER · May 22, 2010

My 97 seriously hates to start moving, if I'm turning at the same time. It does it turning left or right. More so, when turning right. Best way I can describe it, is that it feels like gears binding up. It has the 4.10LS rear in it and the PO had the rear diff cover replaced at a dealer. He didn't say why they replaced the cover, but I figure it wasn't because it was an ugly color.

The PO always had work done at the dealer and lots of parts still have the Ford part stickers on them. Could the dealer have missed putting friction modifier in the diff?

trackspeeder · May 22, 2010

Quite possible. Maybe not enough of the smelly crap was added. To little makes them bind up and chatter. To much makes the LS useless. Add a shot and test drive. But don't add to much.

lotzagoodstuff · May 22, 2010

How much is really involved in pulling the cover and changing it? If there's anything really wrong in there, you might see it when you pull the cover.

Just my .02 worth.

trackspeeder · May 22, 2010

lotzagoodstuff said:
How much is really involved in pulling the cover and changing it? If there's anything really wrong in there, you might see it when you pull the cover.

Just my .02 worth.

Not a big deal. Just a bunch of bolts and some smelly oil.

EMD_DRIVER · May 22, 2010

trackspeeder said:
Not a big deal. Just a bunch of bolts and some smelly oil.

Kinda like inside the long hood of a locomotive.... Especially if it's an Alco or a GE!!! ;Poke

EMD_DRIVER · May 22, 2010

lotzagoodstuff said:
How much is really involved in pulling the cover and changing it? If there's anything really wrong in there, you might see it when you pull the cover.

Just my .02 worth.

I don't have a problem doing that, but I could easily miss a problem. I've never worked on a diff before.. :dunno

trackspeeder · May 23, 2010

EMD_DRIVER said:
Kinda like inside the long hood of a locomotive.... Especially if it's an Alco or a GE!!!

Hey... Stop making fun of the real locomotives. ;p Remember EMD, Every Model Drips. :rotflmao

zpd307 · May 26, 2010

i wouldnt think the friction modifyer would have anything to do with your problem. it is only there to create slip in the diff when turning. i would think bearings, in the carrier or axles..... :dunno

you could pull the cover and see if there are chunks of anything in the oil.

trackspeeder · May 26, 2010

zpd307 said:
i wouldnt think the friction modifyer would have anything to do with your problem. it is only there to create slip in the diff when turning. i would think bearings, in the carrier or axles..... you could pull the cover and see if there are chunks of anything in the oil.

Lack of the additive will make the dif bind and chatter.

EMD_DRIVER · Jun 27, 2010

trackspeeder said:
Lack of the additive will make the dif bind and chatter.

I put in one bottle of friction modifier and haven't noticed any kind of improvement at all. I'll take the truck to work tomorrow and see if putting another 75 miles on it helps...

If not, I'll go exploring for chunks in the differential lube....

zpd307 · Jun 27, 2010

maybe you should pull your axles and check the condition of your axle bearings.

Could it be a lack of friction modifier?

EMD_DRIVER

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trackspeeder

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lotzagoodstuff

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trackspeeder

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EMD_DRIVER

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trackspeeder

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trackspeeder

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