I got the rear differential fluid analysis back from Blackstone and got quite the shock: Looks like there's a problem. The 3.55 gear set was installed back in 1994 and this is the fluid that has been in there ever since. it has a total of 5,000 or so miles on it - mostly at speed on the track. I asked them what the minimum amount of mileage they need on the new fluid can be before I send them another sample to be retested.
Luckily I have that spare NOS diff sitting on my basement floor.
Last edited by njsteve; 10-31-2022 at 11:53 PM.
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10-31-2022, 10:31 PM
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