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Author
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Topic: rear gears
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stroker man
Gearhead Posts: 332
From: Denville NJ USA
Registered: Mar 2002
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posted 01-12-2004 06:50 PM
   
what should i run for street car with my 408w, i have 3.50 posi now but was thinking 3.91 or 4.11, rpm range is down low because of where i live 2000 to 4500, c-4 full manual 10'' converter 3000 to 3500 stall.275-15-60 tires in back.
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steve'66
Gearhead Posts: 9476
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 01-12-2004 07:00 PM
I'd run 3.50-3.91 gears depending on how much street time it's gonna see. More street = 3.50s, More strip - 3.91s. How about 3.70s as a compromize? Naw it's too close to what you already have, so keep the 3.50s.  SteveW
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Dubz
Gearhead Posts: 1888
From: Manitoba Canada
Registered: Oct 2002
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posted 01-12-2004 07:12 PM
full manual c4 = probably not running it primarily as a street car, so sell the posi unit and get a full spool with some 3.91 or higher gears.450 ft-lbs x 2.43 x 3.50 = 3827 ft-lbs
450 ft-lbs x 2.43 x 3.70 = 4046 ft-lbs
450 ft-lbs x 2.43 x 3.91 = 4276 ft-lbs 3.91 would be about 450 ft-lb more thrust in low gear (if your engine is making 450ft-lbs which it probably is) [This message has been edited by Dubz (edited 01-12-2004).] [This message has been edited by Dubz (edited 01-12-2004).]
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steve'66
Gearhead Posts: 9476
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 01-12-2004 08:32 PM
quote:
Originally posted by Dubz:
full manual c4 = probably not running it as a street car, so sell the posi unit and get a full spool with some 3.91 or higher gears.450 ft-lbs x 2.43 x 3.50 = 3827 ft-lbs
450 ft-lbs x 2.43 x 3.70 = 4046 ft-lbs
450 ft-lbs x 2.43 x 3.91 = 4276 ft-lbs 3.91 would be about 450 ft-lb more thrust in low gear (if your engine is making 450ft-lbs which it probably is) [This message has been edited by Dubz (edited 01-12-2004).]
Dubz, You missed his 275-15-60 rear street tires.  He'll never hook up that extra torque. There lies the importance of SLR (starting line ratio). Too much is as bad as too little. SteveW
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Dubz
Gearhead Posts: 1888
From: Manitoba Canada
Registered: Oct 2002
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posted 01-12-2004 08:49 PM
quote:
Originally posted by steve'66:
Dubz,You missed his 275-15-60 rear street tires. He'll never hook up that extra torque. There lies the importance of SLR (starting line ratio). Too much is as bad as too little. SteveW
i am retarded and know not of which i speak. Missed the tires [This message has been edited by Dubz (edited 01-12-2004).]
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kid vishus
Gearhead Posts: 6395
From: middle of NC
Registered: Oct 2000
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posted 01-12-2004 08:52 PM
quote:
Originally posted by Dubz:
full manual c4 = probably not running it as a street car...
That's a bad assumption to make. I have before and will again, used a full manual valve body on the street. It's not a big deal.
His first line states it is a street car, hence the tight convertor and posi unit instead of a loose race convertor and a spool. 
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Dubz
Gearhead Posts: 1888
From: Manitoba Canada
Registered: Oct 2002
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posted 01-12-2004 08:56 PM
quote:
Originally posted by kid vishus:
That's a bad assumption to make. I have before and will again, used a full manual valve body on the street. It's not a big deal.
His first line states it is a street car, hence the tight convertor and posi unit instead of a loose race convertor and a spool.
again, i'm retarded....completely missed that in his post. 
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kid vishus
Gearhead Posts: 6395
From: middle of NC
Registered: Oct 2000
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posted 01-12-2004 09:05 PM
quote:
Originally posted by Dubz:
again, i'm retarded....completely missed that in his post.
No, not retarded. I get in a hurry and skim posts for what I consider relavant info also. I have posted stuff before that was wrong and it was entirely due to me not reading the whole thing first.
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Dubz
Gearhead Posts: 1888
From: Manitoba Canada
Registered: Oct 2002
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posted 01-12-2004 09:10 PM
quote:
Originally posted by kid vishus:
No, not retarded. I get in a hurry and skim posts for what I consider relavant info also. I have posted stuff before that was wrong and it was entirely due to me not reading the whole thing first.
100% guilty of that today 
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stroker man
Gearhead Posts: 332
From: Denville NJ USA
Registered: Mar 2002
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posted 01-12-2004 09:24 PM
dont know yet what i'll do but seems like i would like the 3.91 because i will take her down the 1320, 3.50 posi is a good all around gear ratio, but i want balls out of the hole, 0-60 light to light as fast as i can, thats what i like power get it moving, anymore idea's?
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steve'66
Gearhead Posts: 9476
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 01-12-2004 09:32 PM
Dubz,It's cool, the other clue he gave us was the operating rpm of his big torqey stroker. Kinda low right. Melissa's 408w runs 3.9 gears, and gets off the line pretty good and still hits 124 in the 1/4 at about 6500 rpm. My other car is a 'little street' deal (has to drive itself to the track) I chose 3.70s for it. Its a 440 in a Dart with full manual valve body and dot tires. It only does 5,600rpm at 115mph. But we'll get the mph and rpm up soon. SLR is the Tranny's 1st gear times rear end ratio. Most bracket racers want it pretty low so they can hook up on any track conditions and run the number (consistantly) everytime. Some even run high gear only power glides to this end. Pretty extreme, but if it launches like a school bus it'll probably do it the same each and every time. We're not sinking to that level but, too much torque multiplication for the available traction isn't a good thing. SteveW
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Dubz
Gearhead Posts: 1888
From: Manitoba Canada
Registered: Oct 2002
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posted 01-13-2004 02:15 AM
is there a way to tell when traction would be an issue with your slr?i'd be at about 9.62X multiplied by whatever torque my engine makes (guessing 400+) 3842ft-lbs approx how do you know when is too much?
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