Previous owner of...
BLACK '03 300A "Bagheera"
Ford Racing 4:10's
Denso Iridium plugs
JLT Cold Air Intake
Valentine One Radar Locator w/ remote
Gods Head Steering wheel badge
Sylvania Silverstars
Hitch
Easy way:
Just look at the tach and reference this spreadsheet.
http://www.magindat.net/ssm/info/4r70wratios.xls
No math.
Hard way:
Mark the tire with tape. Jack up the rear. Mark the DS. Put car in N. Turn the tire 1 rev. Count DS revs. No math there, either.
Magindat: (majin-dat) Imagine That.
2013 Ford Taurus SHO
Lemonade - living with Fruit Punch - in Blackmobile's Garage...
FIT Procharger Kit #31 - 3.7 pulley - 9 PSI
World's first BLOW THRU ProCharged Marauder - Reinhart Tuned
#1649
boi
No such thing. Speed can't be off by an even amount. Are you going 0 and it says 10?! It's off by a proportion, often stated as an amount per 10mph.
4.10's will put you off at about 1.5mph per 10mph. If you are actually going 70, speedo will say 80.5. (1.5/10 x 70 + 70) or (70x1.15)
Test in 3rd (OD off) on the highway at 70 since this is 'straight through' 1:1 ratio in the trans.
4.10 rpm should be 3463
3.55 rpm should be 2999
3.73 rpm should be 3151
4.30 rpm should be 3632
Magindat: (majin-dat) Imagine That.
2013 Ford Taurus SHO
Lemonade - living with Fruit Punch - in Blackmobile's Garage...
FIT Procharger Kit #31 - 3.7 pulley - 9 PSI
World's first BLOW THRU ProCharged Marauder - Reinhart Tuned
#1649
boi
Thanks for all the help guys!!!
D.S.C.B.
(\__/)
(='.'=) This is Bunneh. Copy and paste Bunneh
(")_(")* into your signature to help her gain world domination.
You can also use an online gear calculator (similar to the spreadsheet), with the following information:
Revolutions per Mile = 724 (Stock)
Redline (RPM) = 6000
First Gear = 2.84
Second Gear = 1.55
Third Gear = 1.0
Fourth Gear = 0.7
Note your RPM at a fixed speed and vary the Axle Ratio value to determine what you have.
Why are we digging up dead threads today?
Thought you were going on another old thread kick like we did a couple months ago.
If so, here's one for you to check out...
http://www.mercurymarauder.net/forum...hread.php?t=21
Lotta water under the bridge since then, huh? ----->
2003 300B DBP
Build date: 6/19/03
Number 7,792 of 7,838 - 326 of 328
Proud member of the MM "BLUES" Bros.
Purchased: 11/10/05
Eaton swap by ImpalaSlayer 11-09-10
Semper et in Aeternum, Mercurius.
In Memory:
2004 DTR
Build Date 01/27/04
Purchased 04/04/04
Wrecked 10/19/05, R.I.P.
LOL I never knew that was still here, this was the first chip and performance modification for the Marauder.
Last edited by Dennis Reinhart; 05-04-2011 at 08:39 AM. Reason: typo
2003 300B DBP
Build date: 6/19/03
Number 7,792 of 7,838 - 326 of 328
Proud member of the MM "BLUES" Bros.
Purchased: 11/10/05
Eaton swap by ImpalaSlayer 11-09-10
Semper et in Aeternum, Mercurius.
In Memory:
2004 DTR
Build Date 01/27/04
Purchased 04/04/04
Wrecked 10/19/05, R.I.P.
Oh yeah.... This is a dead thread... WHOOOOPS!
If you have sct programmer plug it in and go into program and to gear ratio and choose 4.10 and test it, if its still not good try 3.73 if no good also try all the options until it's corrected, if is there no good in that it should be something other than programing.
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SOLD 12/31/2021
Cobra short block / ProCharger F1-A / Cog drive upgrade / Manley valves / Brian Tooley Racing valve springs / 80# inj. / -8 fuel line / -6 return / Aeromotive 340 pumps and regulator / 2012 GT500 TR6060 six speed / twin disc clutch / Driveshaft Shop GT500 upgraded CV joint shaft / BA5000 blow thru MAF/ 4.10's / Ford Racing 31 spline set up and Girdle / Metco D.S. safety loop / Stainless Works headers, cats, and everything else out back / ClassGlass hood / Bob's hood strut mod / Hurst line lock / Metco control arms / Addco front and rear sway bars / Monroe severe duty shocks all around / Race concepts rotors / Badgeless grille / 35% tint / FBM's interior LED kit and ambient lighting kit / Pioneer FB700 deck / kenwood speaker 4 Ch. / Rockford Fosgate 10" sub and amp / Kicker 6 X 8's all around / back up cam / bluetooth / Pioneer Xm / 704 RWHP 603 RWTQ tuned by Mo's Speedshop.
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