8 3/4 741 strength?

[66charger73]

Hey guys,

I'm gonna put approx. a 400 horse 383 in front of a keisler 5 speed in my 66 and I have a 741 8 3/4 right now with an open 2.94. I want to put a powertrax locker and 3.23's if I can find them (if not then 3.55). Do you think I'd be alright with the 741 or should I look for a 742/489 case. BTW what do you have to change, if anything to put a BB in a SB car?

Thanks for your help.

[RD]

741 is fine IMO.  its not the strength of the pinion that is the problem with breakage in most cases from what I have seen, its the carrier caps and ring gear.  I had a 741 in my 71 charger drag car for 2 years with no problem.

to put a BB in a SB car you need:

• bb motor mounts
• elongated coil lead wires
• bigger radiator
• and i am sure others will chime in

if you are getting a keisler 5 spd, i am sure you are getting a custom driveshaft along with it.  hope this helps.

[Ghoste]

You should have no trouble finding 3:23's and I wouldn't worry too much about breaking it.  The 741 gets a bad rap and it's still a plenty strong rearend.

[Rolling_Thunder]

my boss ran a 3.55 SG 741 behind a blown 440 and a 4-speed...    never had any problems...   

[8WHEELER]

The 741 unit will be plenty strong for you, but they don't sell 323 gears sets yet for the 741 or 742 case.
You will need to find a good used set, there are a lot out there so that will be easy.

Dan

[Rolling_Thunder]

they do sell the 3.55 & 3.73 gear sets though   

[8WHEELER]

they do sell the 3.55 & 3.73 gear sets though   

Yes they do, still wish they would sell the most used gear ever 

Dan

[haueter66]

Also, you will need to look at front and rear suspension and brake upgrades