Odd Differential Issue... and a SCORE!
When I bought my car two and a half years ago, it came with a posi carrier and a good 3.08 ring and pinion in a box (used). A few months ago, I bought carrier bearings and shims to do the changeover. I then decided that since changing my wheels and tires had slowed my speedo down by 10%, I would just change over to the 3.08's and "correct" the speedo.
Since I would have had to borrow the tools to set the pinion depth, I decided to take it to a buddy who said he would do the whole thing for $150 (we go WAAAY back). Yesterday he called and said that there was a problem with the ring and pinion and that he couldn't get it set right (had to use WAAAY too many shims on the ring side of the carrier). After talking about it, we decided to stay with the 2.93's and just install the posi carrier. I went over yesterday afternoon and helped button it up and it works GREAT! Quiet as a church mouse and I no longer am a one-legger!
While I was there, he had another buddy show up who has a sweet, 10.2 sec., 421 SD, '63 Tempest, drag car. The buddy was all over me to trade my car for the Tempest, but I wasn't tempted in the slightest.
Now, the SCORE... The guy with the Tempest, said he had a posi carrier somewhere in the shop and that if I wanted it, I could have it for $50. I told him I was interested depending on which one it was. Well, he found it and it turned out to be a 3.36 and higher (numerically). Needless to say, I jumped on it.
So now, I'm going to collect parts and one of these days we'll go back into the differential and install a set of 3.36's. I'm not looking to go any lower, as I do drive this on the freeway.
All in all, a productive day!
We still cant figure out why the 3.08's didn't work though, as they were a matched set and had been run with that carrier in another housing.
When the only tool in your toolbox is a hammer, you tend to see every problem as a nail.