I have 1970 swinger 340 with an open 741 with 3:23 gears, I would like to eventually put in 3:91's with a sure grip.can I purchase a 489 or 742 pumpkin, and bolt in and go with no problems, will they all work with my u joints and factory drives haft with no differences. Thanks for any input
There are differences in the yokes, thus the the u joint sizes . However, there's two types of yokes for the 489, a large and small, the small is the one you'll need to connect the driveshaft from the 741
