Which differential for automatic Corvette
Thread Starter
Instructor
Joined: Aug 2011
Posts: 114
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Which differential for automatic Corvette
My Corvette still has the 2.73 differential.
This winter I would like to upgrade. I just do not know what differential would be useful.
I'm normally up to 80mph highway. but also sometimes top speed.
Since an exchange does not make sense, because transport costs from Europe to America for my old diff are quite high so im into buying a new one.
Where and what diff should I buy? 3.42 or maybe a 3.7?
Top speed is not soo important. But a quicker acceleration. I'm now at 5.3s to 60mph
Brings a different torque converter even more acceleration?
I like the low rpm at 80mph. But i whant even more acceleration for driving over the hills here in Switzerland.
I have now. A Vararam with powerducts and a Predator tune in it.
greets René
This winter I would like to upgrade. I just do not know what differential would be useful.
I'm normally up to 80mph highway. but also sometimes top speed.
Since an exchange does not make sense, because transport costs from Europe to America for my old diff are quite high so im into buying a new one.
Where and what diff should I buy? 3.42 or maybe a 3.7?
Top speed is not soo important. But a quicker acceleration. I'm now at 5.3s to 60mph
Brings a different torque converter even more acceleration?
I like the low rpm at 80mph. But i whant even more acceleration for driving over the hills here in Switzerland.
I have now. A Vararam with powerducts and a Predator tune in it.
greets René
Drifting
Joined: Jun 2005
Posts: 1,426
Likes: 1
From: brookville pa.
rear
3.42 or 3.73 both will make a big difference the 3.73 rears are harder to find and cost quite a bit more, 3.42 are on ebay for 500/700 bucs shipping to switz. prob. would cost 250/350 so around 1000 total 
Thread Starter
Instructor
Joined: Aug 2011
Posts: 114
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i think i will go with a new unit. Because ordering a used one on ebay and send it to switzerland is to much risk. When it is damaged the backsending ist as expensive as the whole unit did cost.
so better order a new one from a good dealer with a good name and then i order the ratio that is the best for my needs. But even dont know if 3.42 or 3.7 is the best ratio for me.
mfG René
so better order a new one from a good dealer with a good name and then i order the ratio that is the best for my needs. But even dont know if 3.42 or 3.7 is the best ratio for me.
mfG René
Team Owner
Joined: May 2003
Posts: 23,480
Likes: 9
From: East Meadow NY
St. Jude Donor '12
i think i will go with a new unit. Because ordering a used one on ebay and send it to switzerland is to much risk. When it is damaged the backsending ist as expensive as the whole unit did cost.
so better order a new one from a good dealer with a good name and then i order the ratio that is the best for my needs. But even dont know if 3.42 or 3.7 is the best ratio for me.
mfG René
so better order a new one from a good dealer with a good name and then i order the ratio that is the best for my needs. But even dont know if 3.42 or 3.7 is the best ratio for me.
mfG René
I would get a 3.42 rear from the dealer then. I thought all the 3.42 rear ends were from a Z06 these days. If not, then get one for a Z06 since the gears are stronger.
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 326
From: CA.
St. Jude Donor '13-'14-'15
A agree a 3.42 would be the best of both worlds---I still get 28 MPH @60 MPH on my hds/cam '98 A4-- I bought a Z06 take off diff.--They are stronger as the gears are "shot peened" On the diff. it is clearly marked as 3.42 SP ---- I found it on E-Bay for $600
YES a stall converter is (IMO) the BEST mod for any auto C5-----It can make your car
3-5 tenths quicker in the 1/4 mile--even with just a purely stock engine !!!
It still locks ups like a stock converter ( 1400-1600 stall) so the freeway mileage is unchanged--- I would consider a stall of about at least 2400-2800 or nothing at all---for a more of a street friendly non issue change----But if you are more serious and love acceleration I would absolutely get at least a 3000-3200----- Again no change in mileage but it will make your car a BEAST down low---As far as longivity--as long as you add an aftermarket trans cooler and drive "sensibly"-no issues---( except the need for getting new rear tires with the killer launch)---LOL----
YES a stall converter is (IMO) the BEST mod for any auto C5-----It can make your car
3-5 tenths quicker in the 1/4 mile--even with just a purely stock engine !!!
It still locks ups like a stock converter ( 1400-1600 stall) so the freeway mileage is unchanged--- I would consider a stall of about at least 2400-2800 or nothing at all---for a more of a street friendly non issue change----But if you are more serious and love acceleration I would absolutely get at least a 3000-3200----- Again no change in mileage but it will make your car a BEAST down low---As far as longivity--as long as you add an aftermarket trans cooler and drive "sensibly"-no issues---( except the need for getting new rear tires with the killer launch)---LOL----
Thread Starter
Instructor
Joined: Aug 2011
Posts: 114
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Okay you guys convinced me 
Ich think i go with this then:
WCC Is this the Z06 Diff?
And this one:
WCC Torque Converter
You think then im Happy with the acceleration?
Or any cheaper advices? Where i get both for about 2000$? with a 3000 Converter?
Now the top Speed is in 3. Gear. how ist it after? Topspeed in 4.?
mfG René
Ich think i go with this then:
WCC Is this the Z06 Diff?
And this one:
WCC Torque Converter
You think then im Happy with the acceleration?
Or any cheaper advices? Where i get both for about 2000$? with a 3000 Converter?
Now the top Speed is in 3. Gear. how ist it after? Topspeed in 4.?
mfG René
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Team Owner
Joined: May 2003
Posts: 23,480
Likes: 9
From: East Meadow NY
St. Jude Donor '12
Okay you guys convinced me
Ich think i go with this then:
WCC Is this the Z06 Diff?
You think then im Happy with the acceleration?
Or any cheaper advices? Where i get both for about 2000$? with a 3000 Converter?
Now the top Speed is in 3. Gear. how ist it after? Topspeed in 4.?
Ich think i go with this then:
WCC Is this the Z06 Diff?
You think then im Happy with the acceleration?
Or any cheaper advices? Where i get both for about 2000$? with a 3000 Converter?
Now the top Speed is in 3. Gear. how ist it after? Topspeed in 4.?
It will be a night and day difference in acceleration. The stock car is very weak off of the line. The 3.42 will make a big difference. You will also need someone to update the shift points on the car to match the new gear set. If you go to a local tuner, you can get them to speed up and firm up the shifts in the car to make it even better.
Top speed in 3rd gear for my car is over 130mph, but I have more modifications. I don't know what it is since I have not gone any faster than that and I still had more time left in 3rd before I would need to switch to 4th gear.
AKA "The CLOWN"
Joined: Feb 2010
Posts: 6,261
Likes: 13
From: Chicago South Suburbs
Thread Starter
Instructor
Joined: Aug 2011
Posts: 114
Likes: 0
It will be a night and day difference in acceleration. The stock car is very weak off of the line. The 3.42 will make a big difference. You will also need someone to update the shift points on the car to match the new gear set. If you go to a local tuner, you can get them to speed up and firm up the shifts in the car to make it even better.
the difference is unbelievable. It accelerates to the 150mile mark like crazy. but i had no chance to go to maximum because of the traffic here.
mfG René
