2.59 to 3.07, how much difference?
Le Mans Master
Joined: Aug 2000
Posts: 7,760
Likes: 0
From: Lost in the mountains of TN
Re: 2.59 to 3.07, how much difference? (Dilligas)
It should put a pretty big grin on your face. It won't pull as hard at higher speeds. But off the line should be a bit peppier.
Drifting
Joined: Apr 2003
Posts: 1,292
Likes: 2
Re: 2.59 to 3.07, how much difference? (Dilligas)
I would expect it to pull harder at higher speeds also, you would have more revs. It would be a good thing to do. :cheers:
[Modified by britvette, 8:30 PM 11/9/2003]
[Modified by britvette, 8:30 PM 11/9/2003]
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: 2.59 to 3.07, how much difference? (Dilligas)
You will have nearly 20% more torque in all gears; so it will launch harder and pull harder in all gears.
Of course you will run out of gear 20% earlier (shift at lower mph); but with an LT1 that shouldn't be a problem.
Of course you will run out of gear 20% earlier (shift at lower mph); but with an LT1 that shouldn't be a problem.
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Melting Slicks
Joined: May 2000
Posts: 2,029
Likes: 63
Re: 2.59 to 3.07, how much difference? (Lord Odin)
The 3.07 rear end is the factory "performance rear axle". When my L98 car still was completely stock i could easily accelerate faster 0-50mph with my 3.07 car than any of the 2.59 cars I know. The difference was about 1-2 car lengths.
Top speed is a concern for very few of us. It doesn't really matter if it goes 150, 160 or 170 mph if 100-120mph is really the top you will ever see. It is more important how fast you will get to that speed. Well, actually 0-50mph or 50-80mph are the most usefull to street driven cars. Track cars obviously can use performance above that.
ToniH
Top speed is a concern for very few of us. It doesn't really matter if it goes 150, 160 or 170 mph if 100-120mph is really the top you will ever see. It is more important how fast you will get to that speed. Well, actually 0-50mph or 50-80mph are the most usefull to street driven cars. Track cars obviously can use performance above that.
ToniH
Melting Slicks
Joined: Jul 2003
Posts: 3,227
Likes: 50
From: Pomfret, CT
Finalist 2020 C4 of the Year - Unmodified
Re: 2.59 to 3.07, how much difference? (Dilligas)
Talk to Robertpel9 about this. He has a 91 vert and we did this swap in his car a short while back. Do a search in the archives, there were a few posts about the job and the results. Or IM him, he can give you some insight.
-Rick
-Rick
Race Director
Joined: Feb 2003
Posts: 11,671
Likes: 20
From: Lake Wylie SC
Re: 2.59 to 3.07, how much difference? (Dilligas)
Okay Kirby! You're going to like this upgrade. Where do you plan on doing the swap? My garage is available. We just have to do some reading and get some advice from my son. :smash: :party: :smash:
Drifting
Joined: Feb 2003
Posts: 1,976
Likes: 2
From: San Antonio Texas
Re: 2.59 to 3.07, how much difference? (Dilligas)
It will pull better, and possibly even top end higher, as a lot of engines can't over-come the air & weight forces without the gearing advantage.
:chevy
:chevy
Thread Starter
Burning Brakes
Joined: Jul 2003
Posts: 933
Likes: 0
From: Rock Hill SC
Re: 2.59 to 3.07, how much difference? (Curveit)
Thanks for all the info :cheers: The 3.07 is out of a 1984 and I am installing it in a 1994, should everything match up with no problems? I have a Hypertech PP3 for the speedo calibration.
Melting Slicks
Joined: Jul 2003
Posts: 3,227
Likes: 50
From: Pomfret, CT
Finalist 2020 C4 of the Year - Unmodified
Re: 2.59 to 3.07, how much difference? (Dilligas)
There is definatley a difference in the holes on the carrier from the old style to the new style. You will have to drill the holes through the case and batwing to accept the larger bolts that the new diffs use. It is a simple operation!
Also....it is just as simple to change the speedo gear to the correct one. Two minute job. I forget which gear you need, but IM Robertpel9...he'll know.
-Rick
[Modified by cicch95, 10:13 AM 11/21/2003]
Also....it is just as simple to change the speedo gear to the correct one. Two minute job. I forget which gear you need, but IM Robertpel9...he'll know.
-Rick
[Modified by cicch95, 10:13 AM 11/21/2003]
Melting Slicks
Joined: Jan 2002
Posts: 3,293
Likes: 79
From: Jackson MI
Re: 2.59 to 3.07, how much difference? (Dilligas)
I have a chance to get a 3.07 center section for my 94 coupe. Will it be a noticeable difference over the 2.59? Thanks for any advice.
Racer
Joined: Jun 2002
Posts: 401
Likes: 41
From: Parrish FL
Re: 2.59 to 3.07, how much difference? (cicch95)
There is definatley a difference in the holes on the carrier from the old style to the new style. You will have to drill the holes through the case and batwing to accept the larger bolts that the new diffs use.