1965 Dodge Dart stock differential advice

str12-340 said

At least with the 8 3/4 you'll have a rear that your car could have been ordered with and you'll still have small bolt pattern. They are damned well indestructible in a case like yours, and adding a Sure Grip won't solve the inherent weaknesses in the 7 1/4.

Click to expand...

Actually, there 2 designs of 7.25" SG's. One is just like the 4-pinion powerlock 8.75", the other(which I have) is not, in either case the inherent weakness is spitting the spiders. The SG greatly reduces the failure rate of the 7.25, the problem is finding, and worse..rebuilding one if needed.