Quote:

Why bother? My friend goes low 8s with a D60.
I see a few misconceptions in your post.
First, availability of gears. By "soft" I am assuming you mean 9310 gears. The Dana 60 is a truck rear end which was adapted by ChryCo for its ultra-high performance cars. In trucks you can get ratios from 3.54 through at least 4.88 in "regular" steel.
Second, it's not like the 9310 gears are just going to roll over and die. Three factors you can control are type of lubricant, mileage and driving habits. I personally don't believe you are going to drive this car enough to wear out a set of 9310 gears.
Third, on to the selection of limited slips. If you can't find a limited slip differential for a Dana 60 you haven't been looking hard enough. Chrysler used both the four pinion PowrLock and the two pinion TracLock. I'm sure there is a Detroit Locker for one. There are others, too.

The 9.5" ring gear of the 60 isn't the same as the 10.5" ring gear of the D70. As heavy as the D60 is, the D70 outweighs it and it's physically larger as well.

Email www.Doctordiff.com and get his input.

R.



Well, yes Im sure the soft gears wont get eaten up instantly on the street, and being a hight output pro charged engine, I guess you would not want regular street grears as well because when you do get it down the sttrip they might shatter....but anyway...thats not the main question here....

Yes I know you can get limited slip diffs for Dana 60s....but that is not the concern here....

the thing is that the ring and pinion on the Dana 60 are dimensionally smaller than the ones on the Dana 70, thus making them weaker. Also the axles are smaller diameter. A Dana 70 would weigh more of course, but how much more??? 50lbs??? If its only 50lbs I dont think its a bad trade if it will take 2000 HP. Also, on a Dana 70 you can still get a Detroit Locker for it. The question here is, would the Detroit Locker become the weak link here? And how much can a Detroit Locker take? Remember this would be for a brute street pump gas car, where a spool (even though stronger for sure) isnt as streetable.

Also the Dana60 is not a 9,5" ring dimater...it is 9,75" and has a pinion diameter of 1,625".....the Dana 70 is a 10,5" ring gear and has a pinion diameter of 1,75"....so it is much stronger for sure.

The 9,5" I was reffering to was something like a Strange Engineering Ultra case with 9,5" gears and a fab housing. Downside is, soft gears and a spool would be my only choices here, not what you would call 100% streetable...and I wonder if it will take 2000 hp.