2.73s to 3.42s?
Thread Starter
11 Second Club
iTrader: (11)
Joined: Nov 2002
Posts: 501
Likes: 0
From: Orange Park, FL
2.73s to 3.42s? I got a set of 3.42s that I was gonna put in my bird before I decided to buy the TA... The new car has 2.73s. Would I be able to swap in these gears, or would some more parts be needed due to the 2 series carrier? Am I correct that I need a 3 series carrier, something like the SLP take-off Torsen unit (installed one of those on my bird)? How well does that take-off LSD hold up in the LS1s?
<small>[ November 29, 2002, 01:06 AM: Message edited by: Skinny ]</small>
<small>[ November 29, 2002, 01:06 AM: Message edited by: Skinny ]</small>
TECH Addict
Joined: Nov 2001
Posts: 2,003
Likes: 0
From: Live Oak, FL - in the woods where the creatures lurk.
Re: 2.73s to 3.42s? My understanding is you need the 3-series carrier for that swap UNLESS you have the thicker gears for the 2-series carrier.
In my opinion, a good converter with those 2.73s will give you more than the gear swap, but 3.42s would let you run a higher stall converter w/o the "looseness" around town,or maybe just feel a little peppier with the stock converter.
Guess it just depends on what your goal is.
In my opinion, a good converter with those 2.73s will give you more than the gear swap, but 3.42s would let you run a higher stall converter w/o the "looseness" around town,or maybe just feel a little peppier with the stock converter.
Guess it just depends on what your goal is.
Re: 2.73s to 3.42s? I have 3.42's in my Camaro now and it runs beautifully. I had 2.73's stock and I don't miss them. I can't wait until I get my TC. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
On The Tree
Joined: Apr 2002
Posts: 179
Likes: 0
From: Baltimore, MD
Re: 2.73s to 3.42s? Those of you who HAVE gone from 2.73s to 3.42s or 3.73s with an A4, did you do any shift point calibration beyond just updating the gear ratio?
In other words, was it enough to just use the SLP speedo calibrator/Hypertech ratio change/"New Gear Ratio" box in LS1-Edit? Or did you end up hitting the limiter and need to tweak further because of the faster RPM increase and slow shift time?
I already have a Vig2800, by the way, and may get it restalled within the next year, but don't have any immediate TC plans.
Thanks
Mark
<small>[ November 29, 2002, 04:05 PM: Message edited by: squirrels ]</small>
In other words, was it enough to just use the SLP speedo calibrator/Hypertech ratio change/"New Gear Ratio" box in LS1-Edit? Or did you end up hitting the limiter and need to tweak further because of the faster RPM increase and slow shift time?
I already have a Vig2800, by the way, and may get it restalled within the next year, but don't have any immediate TC plans.
Thanks
Mark
<small>[ November 29, 2002, 04:05 PM: Message edited by: squirrels ]</small>
Re: 2.73s to 3.42s? Here is another vote from an experienced TC mod car. Do the TC first and leave the rear gear whine woes for later. There an awful lot of guys out there even on the 2.73 rear ends running great times without cracking into the rear gear problem syndrome. We're traction challenged at best as is and gear stuff gets into speedo/shift point/downshift point/etc......
Staging Lane
Joined: May 2002
Posts: 85
Likes: 0
From: Longwood, Fl.
Re: 2.73s to 3.42s? Hey squirrel, My brother-in-law did the 273 to 342 gear swap in his 94 T/A and ended up having to change shift points as well as the gear ratio in Hpp3. We read the Hpp3 book and it says you don't, but you do! I guess they don't know thier product too well. <img border="0" alt="[Banging Head]" title="" src="graemlins/gr_banghead.gif" />
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Thread Starter
11 Second Club
iTrader: (11)
Joined: Nov 2002
Posts: 501
Likes: 0
From: Orange Park, FL
Re: 2.73s to 3.42s? Thanks for the reply guys. The only reason I was interrested in the gear swap is because I already have the gears. Of course there are other things I would be doing before a TC or gear swap, such as some induction and exhaust mods. Since I already have the gears and don't have a bunch of money at the moment to throw at a good TC, but do have a spare $100 for an SLP take-off torsen, I figured the gear swap would be a great "bang for the buck" so to speak. Even if I had to buy an HPP3 or some other form of computer tuning, which I planned on buying anyway, to adjust the shift points and what-not, would it still not be worth the extra $100 for the new carrier when I ALREADY have the gears and can do the swap myself??
TECH Addict
Joined: Nov 2001
Posts: 2,003
Likes: 0
From: Live Oak, FL - in the woods where the creatures lurk.
Re: 2.73s to 3.42s? I think it would be worthwhile since you have almost everything you need and will be doing it yourself.
It will definitely feel peppier around town than with the 2.73s, although the 1/4 mile gain would not be much.
If you are determined to change gears, then I would definitely do that before I bought a TC, as the gears will influence which TC you ultimately get. For example my car with 2.73 gearing and a ST3500 TC with it's 2.5 STR is already somewhat traction challenged on street radials.
It will definitely feel peppier around town than with the 2.73s, although the 1/4 mile gain would not be much.
If you are determined to change gears, then I would definitely do that before I bought a TC, as the gears will influence which TC you ultimately get. For example my car with 2.73 gearing and a ST3500 TC with it's 2.5 STR is already somewhat traction challenged on street radials.
Re: 2.73s to 3.42s? I see your point, bout already havin the gears, but here are some considerations. You'll need gear lube, install kit and some programmer. PLUS your messing with your diff, which can be BAD if you're not a pro, with 10 bolt experience. So thats several 100's in extras and a minimal gain .2-.3 off the 1/4. Get a 3500 stall 2.5 str from midwest converters for $400. havit it installed for ?? $250 and drop .5 off the 1/4 mile!!!And gas mileage wont change. Trust us gears arent quite what you'll think they are without a stall. Ask around on ls1.com, we've all been in your shoes
later'
</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Skinny:
<strong>Thanks for the reply guys. The only reason I was interrested in the gear swap is because I already have the gears. Of course there are other things I would be doing before a TC or gear swap, such as some induction and exhaust mods. Since I already have the gears and don't have a bunch of money at the moment to throw at a good TC, but do have a spare $100 for an SLP take-off torsen, I figured the gear swap would be a great "bang for the buck" so to speak. Even if I had to buy an HPP3 or some other form of computer tuning, which I planned on buying anyway, to adjust the shift points and what-not, would it still not be worth the extra $100 for the new carrier when I ALREADY have the gears and can do the swap myself??</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">
later'
</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Skinny:
<strong>Thanks for the reply guys. The only reason I was interrested in the gear swap is because I already have the gears. Of course there are other things I would be doing before a TC or gear swap, such as some induction and exhaust mods. Since I already have the gears and don't have a bunch of money at the moment to throw at a good TC, but do have a spare $100 for an SLP take-off torsen, I figured the gear swap would be a great "bang for the buck" so to speak. Even if I had to buy an HPP3 or some other form of computer tuning, which I planned on buying anyway, to adjust the shift points and what-not, would it still not be worth the extra $100 for the new carrier when I ALREADY have the gears and can do the swap myself??</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">
Staging Lane
Joined: Nov 2002
Posts: 88
Likes: 0
From: Florida
Re: 2.73s to 3.42s? I would stay with the 273s in a 10 bolt.much stronger gear.I ran 11.7 all day w/3500 converter and bolt ons for 10 months,373s for a month before the ring gear let loose,plus I needed programing.273s are going back in until I can afford a 12 bolt.My 60ft (1.5s) all day.If you already have torque managenent problems they will be 10 times worse after 373s.
On The Tree
Joined: Nov 2002
Posts: 168
Likes: 0
From: Crestview, FL
Re: 2.73s to 3.42s? Im in the same boat. I have 2.73's and was thinking about going to a 3.73 or 4.10. Lately I have been reading alot of post on 2.73 geared cars running pretty good with 3000-3500 stalls w/2.5str's.
I think I am going to order a Midwest 3200-3500 w/2.5 STR. Pretty cheap and I havent really heard anything negative about them, and they come with a 2 year warranrty.
I think I am going to order a Midwest 3200-3500 w/2.5 STR. Pretty cheap and I havent really heard anything negative about them, and they come with a 2 year warranrty.
