741 vs 489 ?

[HP_Cuda]

If you want peroid correct 489 is your case, otherwise the 741 will work.

Even though the debate on which pig is best I have yet to see someone show me a broken 741 at the pinion shaft.

I'm sure it's possible I just haven't seen one yet.

[LinceCuda]

Someone wrote an article years ago proclaiming hte 741 was "weak".

I'd build the 741 and be done with it.   I've run a lot more than 500hp through them and the pinion IS NOT the weak link in ANY 8.75 case.  It's one of the biggest red-herring, $ wasting things in the mopar community.

I've got a 741 in my Cuda right now with the pinion sheared in  2 pieces with less than 500 hp. I know from my drag racing days nobody in our group of 15 would run 741 because of the pinion. HP goes through the pinion first  and with 1 3/8 I'll pass on the 741 all day long. But if you've had good service from the 741 by all means keep running them. When I can go out and by a 489's a $100 I'm going with the 489.

[Brads70]

    
I couldn't decide and took Neil's advise sold the  8 3/4  and bought a Dana and was done with it!




Sorry couldn't help myself. 

[LinceCuda]

   
I couldn't decide and took Neil's advise sold the  8 3/4  and bought a Dana and was done with it!




Sorry couldn't help myself. 

Lol great reply if I say so myself.

[Chryco Psycho]

After you have scattered as many diifs as I have go bog or go home , Dana is my choice !!

[RUNCHARGER]

I have to agree: For a stock resto a 8 3/4 is fine however if you have a modified car and need to spend money rebuilding an 8 3/4 I always go directly to a Dana. You can't do a $100 rebuild on a diff anymore so when you're looking at $800 and up for rebuild parts for an 8 3/4 it just doesn't make any sense to rebuild them and still have a weak link.

[anlauto]

Huge shout out to Cass at Dr.Diff.....
I decided to order the parts to just rebuild the 741 case that the owner already had....When I went to checkout on their website, the shipping calculator said it was $230 shipping to my CDN address.....

Cass bent over backwards to help me with shipping and saved me over $100 bucks

Most companies would just 

[1 Wild R/T]

Not that it matters but if you have a Broadcast sheet check for the axle code.... Code 100 is a 741 case in a 70 E body 3.23 no Sure Grip but Big U joint...  I've seen two Challenger R/T's with that axle....  So a 489 while generally accepted as correct isn't always correct...

[anlauto]

This 741 case is original to the car according to the owner, but he bought it in 1977 so who knows. No broadcast sheet.