3.55 or 3.70/3.73
Safety Car
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Re: 3.55 or 3.70/3.73 (lotahp)
Looking at your mods, I think you would be happier with the 3.55. The 3.73 might be a little too much for your engine and you might run out of rpms a little too soon. Also going from a 3.08 to a 3.55 is a nice jump and you would be pleased.
Le Mans Master
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From: Not Correctly Restored Stingray Fla.
Re: 3.55 or 3.70/3.73 (Glensgages)
Glenn, I was just rubbing it in a little. :cheers: Can't wait to see my 60' with the new 1st gear. It'll be ready for the EFCC in 2 weeks. It was ready Friday night but 2nd gear wasn't quite right so we all (tranny shop & me) agreed .."BE PATIENT" and no All Chevy Show racing this past Sunday.
OHSIXX... What do you plan on doing with your 3.08. You can purchase a 3.55 ring & pinion from let's say Jeg's (personally I would get a new posi also) Do you have someone local & GOOD to rebuild the rear. OR you can do a swap-out with your rear. And on that note I don't think even half if not 3/4 of these suppliers actually rebuild them themselves. I once did get one from Corvette Central and had some good success. I think VAN STEEL rebuilds the rears themselves and they are some real good people and would stand behind it if something went wrong, but I would doubt anything going wrong, they do good work.
[Modified by lotahp, 4:04 PM 3/16/2004]
OHSIXX... What do you plan on doing with your 3.08. You can purchase a 3.55 ring & pinion from let's say Jeg's (personally I would get a new posi also) Do you have someone local & GOOD to rebuild the rear. OR you can do a swap-out with your rear. And on that note I don't think even half if not 3/4 of these suppliers actually rebuild them themselves. I once did get one from Corvette Central and had some good success. I think VAN STEEL rebuilds the rears themselves and they are some real good people and would stand behind it if something went wrong, but I would doubt anything going wrong, they do good work.
[Modified by lotahp, 4:04 PM 3/16/2004]
Race Director
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From: Living in the Hartland
Re: 3.55 or 3.70/3.73 (OHSIXX)
If you even have a hint of wanting to go with an o/d tranny you might want to look at a richmond 5 speed right now, you can keep your 3.08 gear and have it come out of the whole like a 3.70 but retain you current highway rpm's. Little more expensive for sure (seen them on ebay for $1k which ain't bad)but might be a better long term solution. I have a 3.70 and the highway rpm's are just killing me and my pocket book. If the Richmond 3.08 combo yeilding lower highway rpm's I would prolly go that route but will prolly got with either the richmond 6 speed or keisler tremec.
3rd Gear
Joined: Dec 2003
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From: colonie ny
Re: 3.55 or 3.70/3.73 (OHSIXX)
80 corvette with many recent engine mods. I just recently changed from 3.08 to 3.73. what a difference. but if your looking for a daily driver or for driving on the highway your going to want to look into an overdrive tranny.
Le Mans Master
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From: Not Correctly Restored Stingray Fla.
Re: 3.55 or 3.70/3.73 (Fevre)
If you even have a hint of wanting to go with an o/d tranny you might want to look at a richmond 5 speed right now, you can keep your 3.08 gear and have it come out of the whole like a 3.70 but retain you current highway rpm's. Little more expensive for sure (seen them on ebay for $1k which ain't bad)but might be a better long term solution. I have a 3.70 and the highway rpm's are just killing me and my pocket book. If the Richmond 3.08 combo yeilding lower highway rpm's I would prolly go that route but will prolly got with either the richmond 6 speed or keisler tremec.
Race Director
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From: Living in the Hartland
Re: 3.55 or 3.70/3.73 (lotahp)
lotahp
Richmond 1st gear is 3.27 and 5th gear is 1:1. So with a 3.08 it is like having a 3.70 in first gear but still having a 3.08 in 5th. For someone with a 3.08 already and spending maybe $1,000 to 1,300 assuming getting a used Richmond that might be more attractive then getting a 3.70 gear and not liking to go on the e-way.
[Modified by Fevre, 4:25 PM 3/16/2004]
[Modified by Fevre, 4:28 PM 3/16/2004]
Richmond 1st gear is 3.27 and 5th gear is 1:1. So with a 3.08 it is like having a 3.70 in first gear but still having a 3.08 in 5th. For someone with a 3.08 already and spending maybe $1,000 to 1,300 assuming getting a used Richmond that might be more attractive then getting a 3.70 gear and not liking to go on the e-way.
[Modified by Fevre, 4:25 PM 3/16/2004]
[Modified by Fevre, 4:28 PM 3/16/2004]
Le Mans Master
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From: Not Correctly Restored Stingray Fla.
Re: 3.55 or 3.70/3.73 (NeverDoneC3)
80 corvette with many recent engine mods. I just recently changed from 3.08 to 3.73. what a difference. but if your looking for a daily driver or for driving on the highway your going to want to look into an overdrive tranny.
Team Owner
Joined: Apr 1999
Posts: 21,953
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From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Re: 3.55 or 3.70/3.73 (Fevre)
I'm considering getting a 1-1 fifth gear No OverDrive manual tranny and installing a 2.73 rear end. Even a 2.56 might be Okay for lots of open freeway driving.
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Le Mans Master
Joined: Jun 2003
Posts: 5,446
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From: Not Correctly Restored Stingray Fla.
Re: 3.55 or 3.70/3.73 (Fevre)
lotahp
Richmond 1st gear is 3.27 and 5th gear is 1:1. So with a 3.08 it is like having a 3.70 in first gear but still having a 3.08 in 5th. For someone with a 3.08 already and spending maybe $1,000 to 1,300 assuming getting a used Richmond that might be more attractive then getting a 3.70 gear and not liking to go on the e-way.
Richmond 5-speed IS NOT overdrive?????
[Modified by Fevre, 4:25 PM 3/16/2004]
[Modified by Fevre, 4:28 PM 3/16/2004]
Richmond 1st gear is 3.27 and 5th gear is 1:1. So with a 3.08 it is like having a 3.70 in first gear but still having a 3.08 in 5th. For someone with a 3.08 already and spending maybe $1,000 to 1,300 assuming getting a used Richmond that might be more attractive then getting a 3.70 gear and not liking to go on the e-way.
Richmond 5-speed IS NOT overdrive?????
[Modified by Fevre, 4:25 PM 3/16/2004]
[Modified by Fevre, 4:28 PM 3/16/2004]
Race Director
Joined: Jan 2003
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From: State of Confusion
Re: 3.55 or 3.70/3.73 (lotahp)
Man am I THAT OLD . How fast do guys drive on the highway. I had a '71 Z/28 with a 3.73 and DROVE it from L.I. to Englishtown with no problem cruising at 80mph @ (about) 3300rpm.
:crazy:
Le Mans Master
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From: Not Correctly Restored Stingray Fla.
Re: 3.55 or 3.70/3.73 (Glensgages)
Man am I THAT OLD . How fast do guys drive on the highway. I had a '71 Z/28 with a 3.73 and DROVE it from L.I. to Englishtown with no problem cruising at 80mph @ (about) 3300rpm.
I once drove my '79 Z28, with 4.56 gears, AND a 9" converter, from Pittsburgh to the Poconos (330+ miles one-way), averaging 55 MPH (6-hours, INCLUDING gas-stops & pee-calls)...
:crazy:
I once drove my '79 Z28, with 4.56 gears, AND a 9" converter, from Pittsburgh to the Poconos (330+ miles one-way), averaging 55 MPH (6-hours, INCLUDING gas-stops & pee-calls)...
:crazy:
Glenn, How many days did you say it took you with the 4.56. :jester
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From: Living in the Hartland
Re: 3.55 or 3.70/3.73 (gkull)
I'm considering getting a 1-1 fifth gear No OverDrive manual tranny and installing a 2.73 rear end. Even a 2.56 might be Okay for lots of open freeway driving.
I am assuming it is better, and prolly cheaper in rebuilds, to make the rear end do the high reving then the trans, is that why you are going that route? I have not seen any gears lower than a 3.08 for my rear but imagine they make them or I could get an aftermarket posi. More $ though.
lotahp
Yes the richmond is NOT a o/d trans, the Tremec is and I believe it has the same 3.27 first geat as the richmond.
Le Mans Master
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From: Not Correctly Restored Stingray Fla.
Re: 3.55 or 3.70/3.73 (lotahp)
My wife is going to HATE the 700r4. With the M-20/3.73 combo I would have to stop about every 2 hours or 150 miles. Which about right for "pee-time" for her. I can still wait longer (I'm not that old ) :jester
With th TH350/4.11 combo she loves it. She doesn't have to grabb my leg to tell me slow down there's a trooper up ahead. Everyone is passing me. I doing 70mph @ almost 4000rpm (real strong engine) :eek: :D
Gotta go. Speak to all of you tomorrow :thumbs:
[Modified by lotahp, 4:47 PM 3/16/2004]
With th TH350/4.11 combo she loves it. She doesn't have to grabb my leg to tell me slow down there's a trooper up ahead. Everyone is passing me. I doing 70mph @ almost 4000rpm (real strong engine) :eek: :D
Gotta go. Speak to all of you tomorrow :thumbs:
[Modified by lotahp, 4:47 PM 3/16/2004]
Race Director
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From: State of Confusion
Re: 3.55 or 3.70/3.73 (lotahp)
Glenn, How many days did you say it took you with the 4.56. :jester
With my current '82 set-up, 60 MPH is 2000 RPM, almost a 3:1 ratio (tach-to-speedo)
Team Owner
Joined: Jul 1999
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From: Orange Park Florida
Re: 3.55 or 3.70/3.73 (OHSIXX)
OH6, tell you what, I make you an offer you can't refuse.....
we swap diffs...assuming your yokes are in good shape...and no noises...
I have a 336 ratio, and a 700r4, I feel the 308 is a better choice for me, as first gear is too short for my street taste....
I know the diff in my car now is fine, as I redid it some time ago....down here in Florida....
gimme a call if you interested....
GENE
we swap diffs...assuming your yokes are in good shape...and no noises...
I have a 336 ratio, and a 700r4, I feel the 308 is a better choice for me, as first gear is too short for my street taste....
I know the diff in my car now is fine, as I redid it some time ago....down here in Florida....
gimme a call if you interested....
GENE
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From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Re: 3.55 or 3.70/3.73 (Fevre)
Fevre - I could find where I saw 2.56 gearing. Toms has 2.73 in US gears.
http://www.tomsdifferentials.com/cat15.htm
One of the Vette track champion drag racers uses 4.30 rear gears with his 700R4. So he is near max rpm through the 1/4 with 10X28 slicks.
The reason I got rid of my 3.55 gearing and 700R4 is: I had to be driving 80 mph to even put it in lockup fourth gear. So after lots of figuring 4.11 seem logical. The only problem with gearing like that is that the pinion is spinning so fast that rearend gets so hot that you can't even touch it for 20 minutes after you pull off the track or a high speed run. That's even with synthetic 110w-140 weight gear oil.
http://www.tomsdifferentials.com/cat15.htm
One of the Vette track champion drag racers uses 4.30 rear gears with his 700R4. So he is near max rpm through the 1/4 with 10X28 slicks.
The reason I got rid of my 3.55 gearing and 700R4 is: I had to be driving 80 mph to even put it in lockup fourth gear. So after lots of figuring 4.11 seem logical. The only problem with gearing like that is that the pinion is spinning so fast that rearend gets so hot that you can't even touch it for 20 minutes after you pull off the track or a high speed run. That's even with synthetic 110w-140 weight gear oil.