Gear ratio advice
#948576
03/11/11 03:27 PM
03/11/11 03:27 PM
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Joined: May 2009
Posts: 833
Missouri
galen
OP
super stock
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OP
super stock
Joined: May 2009
Posts: 833
Missouri
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In the belvedere. 500" 4L80 with 0.75 overdrive. 3800stall. I currently am runnong a 9" ford, 4.30 gears and a spool. I am going to build another third member with a posi unit for cruise night stuff. The spool eats up tires. Do not want to sacrifice all of my accelleration but with the torque it blows the tires off anyway. Tires are MT drag radials on 12" rims. 325/50/15s. 28" tall. I am thinking a 3.91, What would you guys suggest?
Last edited by galen; 03/11/11 08:17 PM.
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Re: Gear ratio advice
[Re: galen]
#948577
03/11/11 03:50 PM
03/11/11 03:50 PM
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Joined: Apr 2005
Posts: 1,322
Michigan
crlush
pro stock
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pro stock
Joined: Apr 2005
Posts: 1,322
Michigan
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My valiant cruises pretty good down the highway with no overdrive,391 and 28 inch tires.
Last edited by crlush; 03/11/11 03:52 PM.
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Re: Gear ratio advice
[Re: galen]
#948580
03/11/11 06:37 PM
03/11/11 06:37 PM
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Joined: Jan 2003
Posts: 2,734
Charlotte, NC
446acuda
master
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master
Joined: Jan 2003
Posts: 2,734
Charlotte, NC
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Quote:
In the belvedere. 500" 4L80 with .087 overdrive. 3800stall. I currently am runnong a 9" ford, 4.30 gears and a spool. I am going to build another third member with a posi unit for cruise night stuff. The spool eats up tires. Do not want to sacrifice all of my accelleration but with the torque it blows the tires off anyway. Tires are MT drag radials on 12" rims. 325/50/15s. 28" tall. I am thinking a 3.91, What would you guys suggest?
I saw in the spool post that you have 40 spline axles. I don't think there is any posi or locker for 40 spline axle so you are stuck with a spool unless you drop down to 35 spline axle to use a detroit locker.
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Re: Gear ratio advice
[Re: 446acuda]
#948581
03/11/11 06:44 PM
03/11/11 06:44 PM
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
StealthWedge67
master
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master
Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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I run 3.91's with a 27" tire. Its great around town, but not so much on the highway. Even though you're running 28" tall rubber, If I were going to set one up for JUST street action, I'd go to 3.73's, maybe even 3.55's.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: Gear ratio advice
[Re: StealthWedge67]
#948582
03/11/11 06:45 PM
03/11/11 06:45 PM
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Joined: Nov 2007
Posts: 21,825
Kirkland, Washington
Pacnorthcuda
Too Many Posts
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Too Many Posts
Joined: Nov 2007
Posts: 21,825
Kirkland, Washington
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Quote:
I run 3.91's with a 27" tire. Its great around town, but not so much on the highway. Even though you're running 28" tall rubber, If I were going to set one up for JUST street action, I'd go to 3.73's, maybe even 3.55's.
He has an overdrive.
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Re: Gear ratio advice
[Re: 68GTS383]
#948584
03/11/11 06:54 PM
03/11/11 06:54 PM
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Joined: Nov 2007
Posts: 21,825
Kirkland, Washington
Pacnorthcuda
Too Many Posts
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Too Many Posts
Joined: Nov 2007
Posts: 21,825
Kirkland, Washington
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Quote:
You may have a problem with that 3800 stall with a 355 or 373 and overdrive.
VERY good point! Gonna be pretty loose during steady cruise!
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Re: Gear ratio advice
[Re: DaytonaTurbo]
#948586
03/11/11 08:37 PM
03/11/11 08:37 PM
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Joined: May 2009
Posts: 833
Missouri
galen
OP
super stock
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OP
super stock
Joined: May 2009
Posts: 833
Missouri
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Quote:
.87? I thought 4th in that trans was more like .75?
Daytona you are right, I changed my post. I had it wrote down wrong. Gear ratio is 2.48, 1.48, 1.00, 0.75. Not sure why I was thinking .87, brain malfunction I guess. I use Compushift and I can program the shift speed and when I bring in the overdrive. I also have a set of 35 spline axles as well as the 40s. Going to keep the 40s and pro gears and spool as a unit in case I want to put it back in. Most of my driving is in town and the overdrive is only used when I hit the highway. Thanks for your input guys.
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Re: Gear ratio advice
[Re: ProStDodge]
#948588
03/12/11 12:27 AM
03/12/11 12:27 AM
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Joined: May 2009
Posts: 833
Missouri
galen
OP
super stock
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OP
super stock
Joined: May 2009
Posts: 833
Missouri
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Quote:
Galen,
I have a set of 3.55's with a 35-spline detroit locker you could try for awhile to see if that would be a good set for your usage before you spend money on something you don't need.
My car is far from completion at this point, so I could be without then for a time.
Scott
Thanks for the offer Scott, it will be a little while before I am ready. The engine is still in pieces since fall. On a good note my wife is going away for the weekend. I picked up my heads last week and started filing rings tonight. I get to spend the whole weekend in the shop. Galen
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Re: Gear ratio advice
[Re: galen]
#948590
03/12/11 06:04 PM
03/12/11 06:04 PM
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Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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Quote:
Quote:
.87? I thought 4th in that trans was more like .75?
Daytona you are right, I changed my post. I had it wrote down wrong. Gear ratio is 2.48, 1.48, 1.00, 0.75. Not sure why I was thinking .87, brain malfunction I guess. I use Compushift and I can program the shift speed and when I bring in the overdrive. I also have a set of 35 spline axles as well as the 40s. Going to keep the 40s and pro gears and spool as a unit in case I want to put it back in. Most of my driving is in town and the overdrive is only used when I hit the highway. Thanks for your input guys.
Well then a 3.91 would give you a nice highway rpm with that overdrive.
http://vexer.com/automotive-tools/speed-rpm-calculator
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