fatbillybob

Honestly I have never felt different diffs so I have no datapoints of common ground of understanding. Are there "sounds" to a working diff? For example if I hear constant volume tire squeal through a corner that might be the tire at its grip limit. If I here more of a constant on/off chirping through the turn is that the tire not at the limit quite yet or the sounds of good differential action heard in the tires?

How do you know a bad differential? Can you hear it as noise in the rear end or do you feel it like can't get power down where you could in the past?

Solofast

Depends a bit on the setup, cars with more front roll stiffness will still put down power pretty well as the diff goes away, but you'll feel inside tire wheel spin (the proverbial "one wheeler peelers") as the diff goes soft.

Another thing that sometimes happens is you will feel the car "step" out on corner exit (fast corners) as the diff goes from sticking to slipping. What is happening here is that the tires wind up and the axle torque finally gets high enough to start the diff to slip. Once the plates are slipping the oil gets smeared between the surfaces and the slipping torque is lower than the static torque (where the oil was all squeezed out from between the plates). When that happens you lose the stability from the axle halves being tied together and the back of the car steps out.

The last thing is that a clutch type LSD provides a lot of stability under braking. As the diff goes bad and gets loose on some cars you can feel the car being a bit looser under braking and especially under heavy trail braking.

I used to have a lot of problems with my RX-7 with the LSD. On that car I could tell right away when it needed to be rebuilt. In the Corvettes (C4's and 5's) I've had they have lasted a lot longer and the car isn't as sensitive to the diff so it's a bit harder to tell when it needs to be rebuilt, but if you find the car is "loose" in any of the above instances or if you pick up the rear tire enough to spin on rear tire it's time to get it done.

And one last point about LSD's. They rely on having some friction and some additives or lubricants can make a diff start to slip in short order. Once they start to slip, they can get destroyed in no time at all. I had a Dana 44 rebuilt after 5 years of autocross usage in my C4 and I watched the guy rebuild it to be tight and last. Then he poured in some "super" lube that he recommended. In three weekends it was shot and slipping horribly. We put in new clutch packs and just used the factory lube and the factory friction modifier and it lasted for years.

redtopz

Ha, that's probably one of the only decals I didn't have on there.

Thanks Dan, good to hear you like it and I know you are fast with it too.

Chris Edwards

I see a lot of track cars chiming in about the OSG, any street cars using one?

RX-Ben

I drove my TT on the street (to/from events). There are no quirks or anything else when driving it on the street.

dbratten

Mine is a daily driver. I wouldn't have changed the OEM diff if I wasn't auto crossing and tracking the car. I've noticed no negatives to having the OSG on the street.