I can get an obsolete/discontinued eaton posi for my 2011 F150 9.75 rear end for a killer price (before install!) but they no longer offer parts such as clutch kits for this model. I have only played with Ford trac-lok's in 8.8's prior to this and those really don't hold up well. Even with the cobra carbon fiber clutches, my Mustang is getting decently loose at 40,000 miles.

Would you cnosider putting an Eaton posi in knowing that a clutch rebuild would be near impossible due to lack of parts? How long would you expect it to last under "normal" on-road driving conditions... with maybe some light playing (such as 2-track and hunting/camping access) thrown in occasionally?

 

Me personally would never put a already discontinued model in. If you think the deal is good enough go for it. In a daily driver it should last a long time. Just remember once it's toast you'll have to swap in another. Limited slips only do so much. They don't like burnouts and anything else extreme, it eats up the clutches.

 

You can rebuild the Ford TL with the alternate clutch/steel stacking. I could not find my old notes when someone asked a similar question recently, but the trick is to replace one of the steel plates with one of the old clutch plates when you repack them. There is one of the old clutch plates that has only half of one of its surfaces worn due to how it was put against the side gear. You would restack the plates in with clutch and steel alternated, vs the stock order which had two steels next to each other, which did not contribute to traction.

The thing that burns out those clutches the fastest is when they're forced together and forced to turn at different speeds, like going around corners under heavy power. That's also the cause of power oversteer, so it's best to avoid that for a couple of reasons.

 

Yeah, I've rebuilt a couple t-lok's. Last time on the stang I was using a carbon fiber clutch kit so I didn't have extras to do the alternate method but I've used it in the past and it works great.

I wish my truck had a t-lok. They don't last forever but they are easy to maintain. As it is, I'm pretty 50/50 on the eaton posi. Would be nice to save the cash over a Trutrac but I don't want to be in a spot 50k down the road cursing because its a one wheel wonder again with no way to rebuild it either.