After weighing in all the rear end possibilities, I must consider the factory parts. I have limited knowledge of which ratios (R200) came on which cars. My factory '76 R200 has the 3.50 ratio. I was told that the 86-87 200 sx turbo has 4.11 ratio (R200). I was also told that '82 ZX 5 sp. had 3.90 gears (R200). I was told that the April '87- end of '88 model year 300 ZXT had the limited slip differential (R200) that could be spotted by the finned differential cover. My question is what other ratios are available and what year cars did they come in?