What gears...
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Pro
Joined: Jan 2006
Posts: 599
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From: New York
What gears...
Hey guys..with about 2 weeks away from finishing my 454 rebuild in my 77' i'm already thinking about my next project 4 the winter n that is 2 change the gears....right now i'm running the original 3:08's with a 700r4 tranny......what gears would u guys suggest so that i can get that big blast off the line but still enjoy the parkway ride.....thanx....
Le Mans Master
Joined: May 2002
Posts: 5,084
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From: Lebanon Township New Jersey
Since you've got overdrive and a low 1st gear, go with 3.55 gears. I have 3.73, but no OD. Use a torque converter with about 2,500 rpm stall. Your off the line grunt will be tremendous, when you're not boiling the tires.
Le Mans Master
Joined: Oct 2001
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From: Pine Bluff Arkansas
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-‘19-'20-'21
Originally Posted by BKbroiler
Since you've got overdrive and a low 1st gear, go with 3.55 gears. I have 3.73, but no OD. Use a torque converter with about 2,500 rpm stall. Your off the line grunt will be tremendous, when you're not boiling the tires.
Larry
Race Director
Joined: Nov 2000
Posts: 11,872
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From: Waterloo ontario Canada
Originally Posted by BKbroiler
Since you've got overdrive and a low 1st gear, go with 3.55 gears. I have 3.73, but no OD. Use a torque converter with about 2,500 rpm stall. Your off the line grunt will be tremendous, when you're not boiling the tires.
Drifting
Joined: Oct 2005
Posts: 1,257
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From: North Carolina
I love 3.73's,... Been from 4.56 to 4.11 to 3.55 to 3.42 and even 2.73,.... on a few of my cars and friends, and with the 700R4 3.70 or 3.73 (depending on your year) is the hot ticket. At 70 MPH your cruise speed RPM is aroung 2400 - 2550. I am surprised that no one else recommended them???
Dan
Dan
Pro
Joined: Apr 2006
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From: Flagstaff !!!! baby AZ
Shop says I have 3.08's - but my tach reads 3,500 at 85mpg, normal driving on Phoenix Freeways. I would have thought I would be running 2200 or so...
What do you think I have? 3.08? or 3.55's?
What do you think I have? 3.08? or 3.55's?
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Team Owner
Joined: Sep 2001
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From: Middletown Connecticut
Cruise-In IV Veteran
Originally Posted by 71_454_Green_Machine
Shop says I have 3.08's - but my tach reads 3,500 at 85mpg, normal driving on Phoenix Freeways. I would have thought I would be running 2200 or so...
What do you think I have? 3.08? or 3.55's?
What do you think I have? 3.08? or 3.55's?
I do remember at 55-60 I'm somewhere in the ballpark of 1800-2000
Race Director
Joined: Jan 2003
Posts: 15,172
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From: State of Confusion
Originally Posted by 71_454_Green_Machine
Shop says I have 3.08's - but my tach reads 3,500 at 85mpg, normal driving on Phoenix Freeways. I would have thought I would be running 2200 or so...
What do you think I have? 3.08? or 3.55's?
What do you think I have? 3.08? or 3.55's?
with 2.73s, a 700-R4 A/OD trans, and a lock-up converter, I turned 2000 RPM at 80 MPH.....
Tech Contributor
Joined: Aug 1999
Posts: 15,114
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From: Connecticut, USA
308's with 225 70 tires should be about 2500@60mph. Sounds like you have about a 355 gear. You shoud count the turns to see if you cna figure out what you have.
I've been using 336 in BB cars and the guys love it but they are also used in 1:1 final trans ratios.
The best gear sets are Tom's but keep in mind he only has about 200 sets made then they are back ordered for about a year. I have a job in now and the guys wants 373's. I think I bought the last set and they are up to $325-$375 if you can find them. If you can wait get Tom's gears otherwise you have to settle for much less.
Good luck
I've been using 336 in BB cars and the guys love it but they are also used in 1:1 final trans ratios.
The best gear sets are Tom's but keep in mind he only has about 200 sets made then they are back ordered for about a year. I have a job in now and the guys wants 373's. I think I bought the last set and they are up to $325-$375 if you can find them. If you can wait get Tom's gears otherwise you have to settle for much less.
Good luck
Race Director
Joined: Jan 2003
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From: State of Confusion
Originally Posted by gtr1999
You shoud count the turns to see if you can figure out what you have.
You are correct, Gary..... we can calculate-and-figure all we want, but the most-accurate way is to count drive-shaft/axle revolutions.