im redoing my rear diff and i have a set of 3.23s laying around and i have 2.73s now in the car and i was wondering if it would be worth buying 3.42s when i already have the 3.23s. How much of a differance would there be between the two in performance at a 1/8 mile track and on the street? thanks alot

 

Since the 3.23's are free, I would use them. If you want a performance gain, then use that money towards a 9.5" torque converter. You can see a 2-5 tenths dropped off your ET with the right TC.

 

You have a 3 series carrier for those 3.23's right? Your 2.73's have a 2 series carrier.

 

I would agree! if its free thare is no big differenc at all.

 

yea thats what thought im going to go with the 3.23s.it would be kinda stupid not too. Thanks for the help

 

Just went from 2.73 to 3.23 this week. The 3.23 were just sitting around already on a posi. Great performace step. My spare rearend that I'm slowly bulletproofing will have 3.42.
Go for it those 2.73 need to go.

 

Consider the performance to price ratio.

2.73 --> 3.23 = moderate gain for free.
2.73 --> 3.42 = only a very slight advantage over the 3.23's but at a cost of at least $200.

Think about it that way.... no brainer.