Gonna be sweeeeet!!!
Thread Starter
Racer
Joined: Jan 2013
Posts: 415
Likes: 19
From: Mobile Alabama
Gonna be sweeeeet!!!
Major project going on. Dropping my batwing to replace the stock 2.59 dana 36 with a 3.07. While I have it out I am going to replace my bushings with urethane bushings from Prothane. Also going to polish everything up, batwing, all control arms and hubs, exhaust and driveshafts. Replacing main u-joints while I have it apart, had already replaced half shaft u-joints and rear wheel bearings a couple of months ago. Here is a little sampling of what I can look forward to.
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Max G’s
Joined: Nov 2008
Posts: 2,751
Likes: 79
From: Monroe OH
NCM Sinkhole Donor
OP says in original post he has a 2.59 and going to upgrade to the 3.07 which is a very good idea, even for the street. Enjoy the new gear. One other nice upgrade if you haven't done yet would be the 3 piece under drive pulley set. 
Le Mans Master
Joined: Oct 2004
Posts: 6,314
Likes: 508
From: South-central Missouri
However!! rear wheel torque will be increased by a factor of 1.185 x current torque in any gear. That will make quite a difference, especially at normal city/highway driving!!
Max G’s
Joined: Nov 2008
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From: Monroe OH
NCM Sinkhole Donor
Race Director
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From: Compound in the Grove, Ga.
2026 Corvette of the Year Finalist - Unmodified
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St. Jude Donor '16
Safety Car
Joined: Jan 2004
Posts: 3,783
Likes: 15
From: Northern California
I've had both the 2.59 and 3.07 gear ratios and the 3.07 really made the L98 feel a lot Peppier!...
Be very cautious, when driving in the rain though...
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Be very cautious, when driving in the rain though...
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Last edited by GKK; Jan 30, 2014 at 11:12 AM.
Instructor
Joined: Mar 2012
Posts: 170
Likes: 1
Major project going on. Dropping my batwing to replace the stock 2.59 dana 36 with a 3.07. While I have it out I am going to replace my bushings with urethane bushings from Prothane. Also going to polish everything up, batwing, all control arms and hubs, exhaust and driveshafts. Replacing main u-joints while I have it apart, had already replaced half shaft u-joints and rear wheel bearings a couple of months ago. Here is a little sampling of what I can look forward to.
Melting Slicks
Joined: Mar 2008
Posts: 3,022
Likes: 3
From: Chandler Arizona
I can't believe these c4's came with a 2.59 rear gear. I have 2.73's behind an automatic in another vehicle I own, and it's a dog. I would imagine a 3.07 should be MINIMUM, if not 3.31's and higher. Depending on power level, and the use of the car, I think 3.5x or 3.7x would be great. The overdrive will be more useful, and still provide good MPG (in an auto car).
The LT5 guys are jumping to 3.73's and even 4.10's. Which, behind a 6-speed is very appropriate on the highway and 5th and 6th gear usage. Heck, with the 1st gear in the ZF6, a 4.10 is still fine. "If' you exceed 450rwhp, the 4.10's might feel a bit short in the first few gears, and traction could be a problem.
The LT5 guys are jumping to 3.73's and even 4.10's. Which, behind a 6-speed is very appropriate on the highway and 5th and 6th gear usage. Heck, with the 1st gear in the ZF6, a 4.10 is still fine. "If' you exceed 450rwhp, the 4.10's might feel a bit short in the first few gears, and traction could be a problem.
Melting Slicks
Joined: Mar 2008
Posts: 3,022
Likes: 3
From: Chandler Arizona
This is a mystery ratio to me. I've heard about it, but I haven't come across a car actually equipped with them. I think the difference between 3.45's and 3.54's would be MARGINAL at best.
Pro
Joined: Mar 2013
Posts: 698
Likes: 162
From: Huntington WV
The 2.59 isn't as bad as you would think. Certainly not like the old cars with a 2.73 or 2.56. The 4L60 is geared pretty good for this gear. While not ideal for the stoplight grand prix the 2.59s pull out pretty decent.