So if you guys recall, I'm thinking the clutches are going bad in my rear axle...(still have not confirmed that yet BTW)

https://www.f150online.com/forums/ot...-symptoms.html

Well, I'm the type that'll usually take a situation such as this and use it as an excuse to upgrade. So I started shopping all the various differential options out there and as it turns out, I'm not finding a lot of great options for the 'ol 9.75 axle

Eaton doesn't make the E-Locker for this and Auburn doesn't make the ECTED for it, nor it's heavy duty LS; surprisingly limitied...no pun inteded,

So if some of these super cool options truly aren't available, I'm guessing you're just as well off throwing new clutches in the current differential instead of buying a new LS, yea?? I'm guessing there can't be a significant performance increase from a standard LS replacement from Auburn vs new clutches.

What do you guys think?? At least if I do a clutch pack change, that'll be a pretty straight forward job that won't require any 'adjustments' to the current set-up; just R & R the parts and be done! Changing the diff would most likely require a new set-up be done on everything.

My driving habits don't really justify a real locker anyways, but still.

 

I guess the Detroit Tru Trac is available...guess I'll do some homework on that one.

 

That's what I have right now, since about March of this year. No complaints...

 

I believe if you use a Tru Trac, you can't use Amsoil any more, IIRC they specify dino 80W90.

 

Arb has an air locker

 

That just means its cheaper to replace

I'm looking at the Tru-Trac next year. My rear end is doing the shudder/shimmy/shake on tight turns.

Ford diagnosed it as the clutch packs going out

Try adding some LSD additive first though, see if that helps

 

Well...that diff is out Next!

Heck...where do you even find non-synthetic gear oil these days?

 

i would go with the tru-trac.

 

I've been running a TrueTrac in my '08 Screw for the last three years and it has been great.

HYPO

 

Everywhere. 80W90 dino is easy to find and it's comparatively cheap.

 

Man George, you know that'll be tough for me...a mod that actually prevents me from using Amsoil, LOL

 

I feel your pain on the Amsoil issue, I have got the Tru-Trac in my 07 for the past 2 years and using LUCAS 85W-140 Gear Oil (Dino)...No issues...I think you would be pleased with the Eaton unit Galaxy.

 

Yea, thanks guys. Been trying to do some reading on that unit and it seems like the best way to go. I think on the older trucks, not having a LS is more of an issue than it is on the new trucks with the simulated LS from the braking at what-not. I just don't think my driving style would benefit any from a locker and left dealing with an open diff the remainder of the time.

I've got an email into Eaton about gear oil for that unit...see what they come back with.

From a practical standpoint though, with that unit not having clutches, I for the life of me can't really see 1) why conventional/mineral based oil is recommended over synthetic and 2) how it could degrade performance or what on earth it would possibly hurt to run full synthetic.

 

Hmm - I just read the manual and it now says that you use the axle (vehicle) manufacturer's recommendations for conventional differentials. That implies 75W140 synthetic. However, that also means NO friction modifier.

 

^ i'm not sure what the difference between dino and synthetic oil would be, but not adding F.M. makes sense, since there aren't any clutches needing friction to engage..