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  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech

Gears and RPM's

  • Thread starter Thread starter H What 4.6
  • Start date Start date Dec 9, 2005

H What 4.6

New Member
Jul 29, 2005
56
0
0
Dec 9, 2005
#1
  • Dec 9, 2005
  • #1
As one of my modifications this winter im looking to do gears. I beleive Im going to do 3.73's but i just wanna know what highway RPM'S would be compared to 4.10's if say you were doing 70mph. Ive got a 97 GT 5-Speed.
 

ponysarepretty

New Member
Jul 25, 2005
578
0
0
Dec 9, 2005
#2
  • Dec 9, 2005
  • #2
you know a simple way to figure it out... all you need is a calculator

your RPM will be:
(current RPM)*(new gear ratio)/(old gear ratio)

so it would be
(RPM) * 4.10/3.27 diff from 3.27 to 4.1
(RPM) * 4.10/3.73 diff from 3.73 to 4.1
(RPM) * 3.73/3.27 diff from 3.27 to 4.1
 

MrStevie

New Member
Apr 16, 2005
10
0
0
Orange County, CA
Dec 9, 2005
#3
  • Dec 9, 2005
  • #3
i've got 4.30's with a 3650 tranny, it's been awhile since i've really paid attention to the rpm's but i'mj pretty sure i'm right at 3,000 in 5th gear doing 70
 

HoustonGT

Gilded Gelding
Apr 6, 2003
1,418
0
0
Houston
Dec 9, 2005
#4
  • Dec 9, 2005
  • #4
MrStevie said:
i've got 4.30's with a 3650 tranny, it's been awhile since i've really paid attention to the rpm's but i'mj pretty sure i'm right at 3,000 in 5th gear doing 70
Click to expand...
Pffftt...don't fear the gear... GO 4.56's!!!
 
0

'03GTinFLA

Member
May 29, 2004
486
0
17
St. Petersburg, FL
Dec 9, 2005
#5
  • Dec 9, 2005
  • #5
I cruise between 80-90mph on the highway and my rpms are around 2600-3000. Something like that.
Basically if you see a supercharger in your future = 3:73's
If you drive lots of highway = 3:73's
If you want a big kick in the SOTP meter = 4:10's
just my .02
 

White Stang

Member
Feb 11, 2004
467
0
16
Ft Lauderdale
Dec 9, 2005
#6
  • Dec 9, 2005
  • #6
373's
 

03ghoststang

Well-Known Member
Jul 16, 2005
1,930
1
57
Los Angeles, California
Dec 9, 2005
#7
  • Dec 9, 2005
  • #7
[QUOTE='03GTinFLA]I cruise between 80-90mph on the highway and my rpms are around 2600-3000. Something like that.
Basically if you see a supercharger in your future = 3:73's
If you drive lots of highway = 3:73's
If you want a big kick in the SOTP meter = 4:10's
just my .02[/QUOTE]


:Word: pretty much what he said
 
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