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getting ready to swap center section on my 71-340 Demon, going from 3:91 to 3:23 sure grip. I have decided to use synthetic but not sure on the viscosity, 85W140 OR 75W90, the car is stock and I live Georgia. Any suggestions??? I will add a bottle of the sure grip additive. Thank you.

need help.... I'm changing my center section on my Demon, the new carrier has a 7960 yoke and the my drive shaft is a 7260, do the combination ujoint come shyaft??? yoke on the inner grooves for the grooves or do I need to change the shaft. Thank you

I'm thinking of using a combination U-joint, I'm changing center sections and I don't want to take a part the one in the car right now, I have a 489 case but a the pinion is a 10 spline, my repalcement case is also a 489 case but it has a 29 spline pinion, the yoke on the car now is the smaller...