8 3/4 question

i see a lot of either questons 489 or 741 dif is one better then other
whats the differance ...do they both bolt in the housing ,are there even more #s
the one i got for my dart is a 489 that i want to change the gear ratio and put a clutch type sure lock
i think my 67 pu is a 741 ? when i was getting bearings think i had to know if early or late
not sure what the 65 pu has
thanks
How is it that MY OPINION rates such a big fat X?
You can't big red X an opinion. A little one maybe, but what's the point. I bet you Turk, Red-Xs all the Christians too, just for having a different opinion.
I've been driving A-bodies since 1970, most of them with stock 340s or 360s, 4-speeds, and maybe headers.
In street-stock class, they are low to mid 14 second cars. Good luck killing any 8.75 on the street, in a Stock Dart.

OP said;
stock 340/4-speed, with 245/60-15s, looking for 3.55s
Who the heck cares about anyone's racing experience.

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You guys are so busy swinging dicks, you can't even agree on a simple answer.
I'll say it again, for this OP, it hardly matters.