3:73 vs 3:08 stock
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Instructor
Joined: Jul 2002
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From: Little Rock AR
3:73 vs 3:08 stock
I have the 75 L48 that probably puts out around 200 hp. What can I expect from changing from the stock 3:08 to the 3:73s. Any one done this that can comment? Any idea on cost?? Thanks
Safety Car
Joined: Aug 2001
Posts: 3,892
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From: Pettis Performance 565 with two stages of Nitrous Supply nitrous 1.082, 4.61 at 155, 7.17 at 192
Re: 3:73 vs 3:08 stock (vettinator)
3.08 to 3.73 will give you a noticable increase in acceleration. Surely enough to feel in the seat of your pants.
Le Mans Master
Joined: Feb 2002
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Re: 3:73 vs 3:08 stock (vettinator)
0-60 will make you think you dropped a new motor in it. 80 on the highway sucks with 3.73. keep that in mind, especially if you don't have OD. If you don't plan to do much freeway driving, go for it! 3.73's will make a world of difference. Personally, I like the gears high enough so I can drive it on the freeway without the worries of 3000 rpm the whole time, and extra noise. If I do decide on a gear change, I'll probably go with 3.23. The stock 2.83 is pretty high, robbing me of power.
Melting Slicks
Joined: May 2002
Posts: 2,508
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From: Wisconsin
Re: 3:73 vs 3:08 stock (vettinator)
Yeah, you'll get more ballsy around town but don't even bother going above 60mph for long unless you don't mind paying for gas. If all you do is drive city or have an overdrive tranny, go for it, you won't regret it. My 3.55s are at 1500rpm at 30mph, so it works out pretty well with my TH350.
Drifting
Joined: Feb 2001
Posts: 1,603
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From: San Francisco, CA
Re: 3:73 vs 3:08 stock (vettinator)
Ditto what others have said. Mine came with 3.70 from the factory and pulls nicely with a 4 speed but really needs a 5th gear and a 30 gallon tank on the highway.
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Instructor
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From: Parker TX
Re: 3:73 vs 3:08 stock (R. Bruno)
R Bruno
Sure could get on with a 5sp and my 3.70. Don't think the bladder would take a 30 gallon tank though. Ha! :cheers:
From Bahrain
River Rat (Desert Rat for now) :flag
Sure could get on with a 5sp and my 3.70. Don't think the bladder would take a 30 gallon tank though. Ha! :cheers:
From Bahrain
River Rat (Desert Rat for now) :flag
Melting Slicks
Joined: Aug 2001
Posts: 2,043
Likes: 1
From: Elkhorn WI
Re: 3:73 vs 3:08 stock (riorata)
3.70 is stock but US GEAR makes a 3.73 for us....don't believe me? call Tom's Differentials he'll price and sell em to ya.
as for 3.08's to 3.70, I just did this a month ago and man....am I LOVING IT.
I used to drive a 350/auto/3.73 rear wheel, year round here in WI for 9-10 years without overdrive in a '81 regal. I never complained one bit ! and I am not complaining now either !! :cheers:
here is a pic of my rear-end buildup. http://temp.corvetteforum.net/c3/ylo...ff_rebuild.jpg
:yesnod:
as for 3.08's to 3.70, I just did this a month ago and man....am I LOVING IT.
I used to drive a 350/auto/3.73 rear wheel, year round here in WI for 9-10 years without overdrive in a '81 regal. I never complained one bit ! and I am not complaining now either !! :cheers:
here is a pic of my rear-end buildup. http://temp.corvetteforum.net/c3/ylo...ff_rebuild.jpg
:yesnod:
Team Owner
Joined: Jun 2001
Posts: 43,136
Likes: 155
From: Thomson Georgia
Re: 3:73 vs 3:08 stock (ylose)
[QUOTE]3.70 is stock but US GEAR makes a 3.73 for us....don't believe me? call Tom's Differentials he'll price and sell em to ya.
as for 3.08's to 3.70, I just did this a month ago and man....am I LOVING IT.
I used to drive a 350/auto/3.73 rear wheel, year round here in WI for 9-10 years without overdrive in a '81 regal. I never complained one bit ! and I am not complaining now either !! :cheers:
I love mine and buy will she shred the tires out of the hole
as for 3.08's to 3.70, I just did this a month ago and man....am I LOVING IT.
I used to drive a 350/auto/3.73 rear wheel, year round here in WI for 9-10 years without overdrive in a '81 regal. I never complained one bit ! and I am not complaining now either !! :cheers:
I love mine and buy will she shred the tires out of the hole
Drifting
Joined: Feb 2001
Posts: 1,603
Likes: 0
From: San Francisco, CA
Re: 3:73 vs 3:08 stock (riorata)
Riorata- don't say bladder! My Vette has a bladder problem. Its down to maybe 13-14 gallons now!!! I think when it dips below 10 galons it will be time for radical bladder surgery.
PS- Are you really in Bahrain? Must get hot riding around in the Vette with a robe and turbin on. :cheers:
PS- Are you really in Bahrain? Must get hot riding around in the Vette with a robe and turbin on. :cheers:
Le Mans Master
Joined: Jan 2001
Posts: 6,938
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From: San Diego CA
Re: 3:73 vs 3:08 stock (R. Bruno)
Alywn678 what RPM's are you running at 70 MPH? I have a 3.07 but with the close ratio 4spd. I'm still 3200 RPM at 70 MPH. I cannot grear up my choice is to go with a 5spd. with a tall OD gear.
Melting Slicks
Joined: Aug 2001
Posts: 2,753
Likes: 1
From: Fishkill NY
Re: 3:73 vs 3:08 stock (Cali,77,L-82)
WOW, I have a 3:70 with an M20 4sp and at 70 I'm doing about 3400 rpm. I would have thought that with 3:07's it would be much better :confused: Unless the close ratio (M21 I think) is causing that..
Alywn678 what RPM's are you running at 70 MPH? I have a 3.07 but with the close ratio 4spd. I'm still 3200 RPM at 70 MPH. I cannot grear up my choice is to go with a 5spd. with a tall OD gear.
Melting Slicks
Joined: Jun 2001
Posts: 2,340
Likes: 2
From: Moro IL
Re: 3:73 vs 3:08 stock (vettinator)
3.55's would be a good compromise, I'm pretty happy with mine overall. The 3.36's were better on the highway though but not that big of a difference, 3000rpm is 65mph with 26" tires and 3.55's. the 3.36's were probably about 2700-2800 rpm at 65mph. As far as cost, there is a wide variance depending on how much of the work you do yourself, If you pull your own thid member and take it to have the gears setup your probably looking about 3.5-4.5 hours labor plus 120 in parts not including the gears if you want to overhaul the whole thing (good idea while it's apart). The gear set will probably run about 250.
:cheers:
Pat Kunz
[Modified by 73 LS-4, 8:15 PM 7/15/2002]
:cheers:
Pat Kunz
[Modified by 73 LS-4, 8:15 PM 7/15/2002]
Instructor
Joined: Oct 2001
Posts: 115
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From: Tucson AZ
Re: 3:73 vs 3:08 stock (ylose)
3.70 is stock but US GEAR makes a 3.73 for us....don't believe me? call Tom's Differentials he'll price and sell em to ya.
Its true....I just got my 3.73's back from Western Differential. The gears are 41-11, and they are US GEAR....havent gotten to try it out yet though :sad:
Jason
Team Owner
Joined: Jun 2001
Posts: 43,136
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From: Thomson Georgia
Re: 3:73 vs 3:08 stock (Cali,77,L-82)
Alywn678 what RPM's are you running at 70 MPH? I have a 3.07 but with the close ratio 4spd. I'm still 3200 RPM at 70 MPH. I cannot grear up my choice is to go with a 5spd. with a tall OD gear.
