I would go with the YS1 with factory LSD. It supposedly has as short or shorter gearing than the s1/J1 and you wouldn't have to crack the case open to install a new LSD. The YS1 will need a 92-93 integra clutch kit since it has a different spline count than the earlier teg transmissions. Yes the the 90-93 integra axles will work as long as you are using a 90-93 integra intermediate shaft. Removing the spacer from the inside of the hub and the dust seal on the axles will help the axles fit better and not bind up inside the hub. Good Luck
