I sent him this >>
"Hello, it is very unlikely that is a 3:36 ratio because of very few ever being used in the US, but if you will confirm the stamped numbers on the ring gear, I will buy this diff from you, or bid until I win it. Other than looking with your own eyes, I would not be advertizing that as a 3:36, just by spining the shafts and counting the turns. The 3:54 is to close to a 3:36 to tell that way. You really need to remove the rear cover and read the numbers, that will end all speculation, as I'm sure your getting many emails from doubters on the ratio. If it is indeed a 3:54, they are a dime a dozen, so you might just make a bad deal selling that as a 3:36 w/o knowing for sure. I'm not trying to disrespect you here, just trying to save everyone possible grief... thank you"
Here is his reply I just received:
"coming at youon th ring gear is 39 teeth 3.90 :1 i will have to pull the diff i pulled cover off the diff pin =10 ring = 39 thanks"