3:08 or 3:55
Guest
Posts: n/a
Re: 3:08 or 3:55 (page62)
I don't drag race..on the track that is.. :D I do drive around town and back and forth to work.. 45mph roads.. and some highway.. With 3.08 I was turning almost 3000rpms at 65mph.. Guess it will be much higher with 3:55?
I'm not a kid but I would like to break the rear tires when I wanted to.. Right now I get a little chirp but not much more. Will the 3:55 make it easier.. Not that it's important but.. well.. it is.. :cheers:
I'm not a kid but I would like to break the rear tires when I wanted to.. Right now I get a little chirp but not much more. Will the 3:55 make it easier.. Not that it's important but.. well.. it is.. :cheers:
Le Mans Master
Joined: Mar 2002
Posts: 7,456
Likes: 2
From: Coming home from Luckenbach Texas
Re: 3:08 or 3:55 (Koz)
Are you sure you have 3.08 rear gears? That already sounds more like 3.55 to me. Go to http://www.smokemup.com/auto_math/index.php and do some calculations to check your rear gear ratio....and to check what it would be like with a different ratio.
If you have a 4-speed, you should always be able to light up those tires by revving the engine and popping the clutch :yesnod:
If you have a 4-speed, you should always be able to light up those tires by revving the engine and popping the clutch :yesnod:
Race Director
Joined: Mar 1999
Posts: 10,258
Likes: 1
From: Calif.
Re: 3:08 or 3:55 (Koz)
I just dumped my 3.08s in favor of 3.70s. I can't tell you how anxious I am to put the car onthe grojund and try them out at the track. My best-ever 60-foot time with the 3.08s was 1.74. I think that number ought to come down a bit with the 3.70s. :reddevil But I have some bushings to swap and some tubes for the MTs to order...
Le Mans Master
Joined: Feb 1999
Posts: 8,351
Likes: 75
From: Tampa Bay FL
Re: 3:08 or 3:55 (Koz)
I upgraded to the 3.54 Spicer gearset when I had my new rear diff blueprinted. I have my orig 3.08 geared differential sitting under the workbench. I moved to the 3.54's since I added the 700R4 with the .70 overdrive and now benefit from both neck snapping off of the line acceleration and a final (over)drive ratio improvement over the 3.08/TH350 combo. I added a 1800rpm stall torque converter and a goodly number of engine power-adders that really make standing starts much more exciting :smash: :smash: :smash:
New gears are about $200-250 from most reputable differential shops.
New gears are about $200-250 from most reputable differential shops.
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Safety Car
Joined: Jun 2001
Posts: 4,004
Likes: 2
From: Severna Park Md
Re: 3:08 or 3:55 (Koz)
Just for info, and not that you would want to with a 4spd that has 1:1 4th ratio, but you can go as low as 3.90 using the same carrier. I swapped out 3.08 for 3.90 and used the same diffirential carrier. With my O/D auto tranny which has .67 4th, convertor locked in 4th returns 2250rpm@65mph with 26" diameter tires. The 3.90 + the 2.74 1st gear ratio gives great TQ from the hole. :cheers:
Safety Car
Joined: Jun 2001
Posts: 4,004
Likes: 2
From: Severna Park Md
Re: 3:08 or 3:55 (Koz)
Before you decide to change and then what to change to, make sure you know what yur starting with. Tachs arent always accurate. Not always a good idea to guess these things.
Le Mans Master
Joined: Jun 2002
Posts: 8,339
Likes: 24
From: I can walk to MA
Re: 3:08 or 3:55 (Koz)
Hold one side yoke still - and turn the other.
Count the # of turns that the input yoke makes for 1 side yoke revolution.
It should be fairly easy to tell 3.08 vs 3.55 vs 3.73.
HM - just looked in the resto guide (Richard Prince).
Maybe a typo - but the book says ALL 1980s are 3.07.
Look for a code OF or OH somewhere.
:seeya
[Modified by NHvette, 5:14 PM 3/3/2003]
Count the # of turns that the input yoke makes for 1 side yoke revolution.
It should be fairly easy to tell 3.08 vs 3.55 vs 3.73.
HM - just looked in the resto guide (Richard Prince).
Maybe a typo - but the book says ALL 1980s are 3.07.
Look for a code OF or OH somewhere.
:seeya
[Modified by NHvette, 5:14 PM 3/3/2003]
Tech Contributor
Joined: Aug 1999
Posts: 15,176
Likes: 3,992
From: Connecticut, USA
Re: 3:08 or 3:55 (Koz)
Divide the number of ring gear teeth by the number of pinion gear teeth for the ratio.
PS: The strut bushings can be pressed,burned or cut out. I prefer to press them.
Gary
PS: The strut bushings can be pressed,burned or cut out. I prefer to press them.
Gary
Race Director
Joined: Apr 2000
Posts: 17,676
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
Re: 3:08 or 3:55 (71vettman)
If you have a four speed with a 2.88 first gear then I would stay with the 3.08 rear end it is deep enough :D
Race Director
Joined: Aug 2000
Posts: 10,854
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From: HONOLULU HAWAII
Re: 3:08 or 3:55 (Koz)
I installed 3:70 rear gears....then installed a performance 700R4 with a Super Yank 3500 stall.....Car is crazy out of the hole on street tires.....hooks like super glue with MT ET Streets.....and cruises like a kitten on the freeway.....will go to 150 MPH without affecting the wind-blown devil-may-care James Bondish look on my face. :D :seeya Cappy