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Old 03-31-2005, 03:35 PM
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Default 3.42 gears

Right now I have 2.73 gears in my z28, with a stock (7.5" i believe?) rear. What all would I have to change to go to 3.42 gears? Someone said something about having to change to a 3 series LSD, but I know nothing about that so any help would be appreciated.

Also, for whatever I would have to fix, what would be an estimate of how much it would cost to have that stuff installed?

Thanks!
Old 03-31-2005, 03:46 PM
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w/ the stock rear, i believe you can jsut drop in the gears, you will def. need to recalibrate the Speedo.
Old 03-31-2005, 05:34 PM
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yea, i thought it was a simple swap too..
Old 03-31-2005, 06:51 PM
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Anyone know for sure?

And as for the install price, what about that?
Old 03-31-2005, 07:28 PM
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i believe when swapping from a 2.73 to a 3.xx, u need a different carrier. the 2.73 have a 2 series carrier, u need a 3 series carrier. goto one of the sponsers and they should have the parts u need. i recomend texas speed.

u mite want to try this forum:
do a search, ive seen the topic a couple of timeshttps://ls1tech.com/forums/gears-axles-15/


here u go, i did all the work for ya, just read this thread: https://ls1tech.com/forums/showthrea...series+carrier
Old 03-31-2005, 09:20 PM
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Different carrier. You might want to take this opportunity
to move up to a better differential. You'll be in for the
setup work anyway. I put a T-2R and a hard pinion spacer
and a full master rebuild kit in along with 3.42s. Most sane
people will tell you that's a waste of money on a 10 bolt but
so far, so good. The hard collar and parts kit all told was
about $150 and my diff is now like new. I did that because
I found a sh!tload of shavings when I pulled the cover off
to put the MAC girdle; figured that couldn't be making the
bearings very happy. I think you want a better chunk because
you are going to be putting more torque to the wheels (real
torque, not engine-referred fudged dyno number torque)
and if you're spinning one wheel now this is not going to
improve. T-2R for a road racer, Auburn or Auburn Pro for
a strip car. Don't bother with a T-2HD like SLP sells (for
about the same price as Strano sells the T-2R at); that
has the beef but not the grip. You can pick up 3.23
Torsen chunks for next to dirt (I gave mine away to a
buddy in fact).
Old 03-31-2005, 11:18 PM
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Make sure you note if your car doesn't have traction control, you'll need to get a different reluctor ring for the 3 series carrier.
Old 03-31-2005, 11:57 PM
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Well I'll be sure to note that so I can inform others in future posts. Learn something new everyday.
Old 04-01-2005, 12:49 PM
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Do what i did and buy a whole rearend from someone. Swap it in and go. Someone was just selling a rear off of an 02 SS with like 2500miles on it for 500.00. I only paid 325 for mine but it had about 4?,??? miles.
The other option is go to Thunder racing and buy the thick gears made for the 2 series carrier.
Old 04-01-2005, 01:06 PM
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About the reluctor ring, If you have a 4 channel you do not have to worry about it. Only if it is a 3 channel do you need to change the ring.
Old 04-01-2005, 06:02 PM
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Richmond make a "thick gear" for that swap. I went from 2.73 to 3.73 with no new carrier.
Old 04-01-2005, 06:14 PM
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I got a 96 LT1 rear with 342s for 150$
cleaned & POR-15 , an added the LS1 brakes.
put this in 98 TA that had 272s.
What a difference.
Old 04-01-2005, 07:51 PM
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Well I don't have a huge amount of money to blow, so I was looking for whatever would be the cheapest route to go.
Old 04-01-2005, 08:23 PM
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Originally Posted by RevGTO
Make sure you note if your car doesn't have traction control, you'll need to get a different reluctor ring for the 3 series carrier.
I just switched to a 3 serries carrier with 342 gears from my old 2 series carrier with 273 gears. Now my abs-inop light is on. So I take it I will need this ring? If so where can I get it? Or can I get it from the dealership and if so any part #'s. Thanks




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