Rear end options?
Thread Starter
Burning Brakes
Joined: Sep 2004
Posts: 917
Likes: 0
From: Vernon British Columbia
St. Jude Donor '05
First C3 General Poster!
Rear end options?
What can you do on an 81 with reguards to upgrading the driveshafts, axelshafts, u joints, etc. Are there carbon fiber parts avaliable for all the shafts to the half shafts? What have you guys done to reduce the rotating mass and friction?
Melting Slicks
Joined: Oct 1999
Posts: 2,581
Likes: 14
From: Tolar Texas
Performed a search for Carbon Fiber Driveshaft. Here's a couple of threads from the archives that should help. Searching the CF archives is always worth a shot!
http://forums.corvetteforum.com/show...ber+driveshaft
http://forums.corvetteforum.com/show...ber+driveshaft
http://forums.corvetteforum.com/show...ber+driveshaft
http://forums.corvetteforum.com/show...ber+driveshaft
Thread Starter
Burning Brakes
Joined: Sep 2004
Posts: 917
Likes: 0
From: Vernon British Columbia
St. Jude Donor '05
First C3 General Poster!
Here is another question that I shows my ignorance to my car...what were the rear end diff ratios in 1981? Anyonehave any clue or WHERE you could find out? Ive tried looking around a fair bit but have yet to find out much.
Pro
Joined: Feb 2003
Posts: 582
Likes: 0
From: Ashaway RI
Standard Manual Transmission
four-speed fully-synchronized
floor-mounted gear shifter
gear ratios
1st = 2.88:1
2nd = 1.91:1
3rd = 1.33:1
4th = 1.00:1
Rev = 2.78:1
Final drive ratio: 2.72:1
Automatic Transmission
Three-speed Turbo Hydra-Matic
floor-mounted gear shifter
gear ratios
1st = 2.52:1
2nd = 1.52:1
3rd = 1.00:1
Rev = 1.93:1
Final drive ratio: 2.87:1
I got this info off the following link.
1981 Corvette
four-speed fully-synchronized
floor-mounted gear shifter
gear ratios
1st = 2.88:1
2nd = 1.91:1
3rd = 1.33:1
4th = 1.00:1
Rev = 2.78:1
Final drive ratio: 2.72:1
Automatic Transmission
Three-speed Turbo Hydra-Matic
floor-mounted gear shifter
gear ratios
1st = 2.52:1
2nd = 1.52:1
3rd = 1.00:1
Rev = 1.93:1
Final drive ratio: 2.87:1
I got this info off the following link.
1981 Corvette
Safety Car
Joined: May 2001
Posts: 3,758
Likes: 3
From: Surrey
bertmeister posted it above under final drive ratio (2.87:1 for auto, 2.78:1 for manual - sorry, stick shift!).
If you've got an auto then at 70mph you should be seeing about 2700rpm with the converter locked in "3", or 3000rpm with it unlocked when running a 2.87:1 rear ratio.
If you've got an auto then at 70mph you should be seeing about 2700rpm with the converter locked in "3", or 3000rpm with it unlocked when running a 2.87:1 rear ratio.
Thread Starter
Burning Brakes
Joined: Sep 2004
Posts: 917
Likes: 0
From: Vernon British Columbia
St. Jude Donor '05
First C3 General Poster!
barf...this is what I get for being an ignoramus 18 year old...
ok so final drive ratio doesnt have to do with the tranny or does it? I thought tranny gears were something else...bugger...so what does it mean to have 3.73 gearing? Does it make a difference if youve got a 200 4-r or a TH350 as to whats going on back there or what? My god Im stupid....
ok so final drive ratio doesnt have to do with the tranny or does it? I thought tranny gears were something else...bugger...so what does it mean to have 3.73 gearing? Does it make a difference if youve got a 200 4-r or a TH350 as to whats going on back there or what? My god Im stupid....
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Safety Car
Joined: May 2001
Posts: 3,758
Likes: 3
From: Surrey
The final drive ratio is the ratio in the diff, whether 2.87, 3.55, etc. For the 2.87 it just means that every 2.87 revolutions of the driveshaft will turn the wheels once. How many revolutions the driveshaft is doing with respect to the crankshaft depends on the ratios inside the transmission.
Burning Brakes
Joined: Jul 2002
Posts: 1,127
Likes: 99
From: Nova Scotia
I beleive the final drive ratio is the ratio of the top tranny gear multiplied by the rear end gear ratio, so on a 1.00:1 ratio top gear(as with 81s) theyre the same thing, however, if you have an overdrive it's different