Need Advice on Rear End Gears

Roger Dixon

New Member
Dec 30, 2018
10
0
1
68
North Carolina
I currently have a 2001 GT, Vortech v2 with intercooler, Kooks lt headers with catted x pipe and magnaflow catbacks. I'm making 380 rwhp. My tuner suggested going with lower gears to "wake up the car" and make up for some of the torque I lost when installing the headers and intercooler. I dropped about 2 lbs of boost and am now at 8.5 lbs. It is only in the higher rpm's that I feel my car really take off now. I currently have stock rear end, 3.27 gears. I am thinking of moving up to 3.73. Right now I am running Michelin Pilot Sport A/S 3+ 285/40zr18's on the rear. I get great traction and never worry about excessive spinning when flooring it. Will 3.73 gears create excessive loss of traction, and will I still have any functionality in first and second gears?

Thanks for any advice.
 
  • Sponsors(?)


Dark04GT

10 Year Member
Apr 27, 2008
739
65
49
NC
Probably cheaper to drop one pulley size and see if that is the pep you were looking for.

Stock block can take a pulley size drop.

If that is not enough pep than look at your long term goals and determine what gear lines up best with the 1/4 mile trap speed you are looking for at the top of 4th.

4th gear engine RPM (3.27/3.73/4.10) @ MPH
50 - 2204/2514/2764
60 - 2645/3017/3317
70 - 3086/3520/3869
80 - 3527/4023/4422
90 - 3968/4526/4975
100 - 4409/5029/5528
110 - 4849/5532/6080*
120 - 5290/6035*/6634*

3.73’s are the most I would go for your power level with a stock tire height.... you will be right on the edge of running out of gear. Personally I still have the stock gears because I spend the vast majority of my time on the street and I am planning for more power. :nice:
 
Last edited:
Thread starter Similar threads Forum Replies Date
M Rear suspension advice needed 1965 - 1973 Classic Mustangs -General/Talk- 4
S Need some advice on rear suspension setup 2010 - 2014 Specific Tech 0
K Interior and Upholstery 1967 fastback 3-point harness in the REAR. Need advice. 1965 - 1973 Classic Mustangs -General/Talk- 2
D Replacing Rear Quarter Panel On A 94gt, Need Advice 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 4
J Need Advice On '01 Gt Rear Suspension Upgrade 1996 - 2004 SN95 Mustang -General/Talk- 2
dracoo Need Rear Suspension Advice 2010 - 2014 Specific Tech 8
9 Right Rear Quarter Panel Damage Need Advice 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 1
Mikie Beef up the rear...need advice. SN95 4.6L Mustang Tech 18
tjy00gt 00 GT Rear end Problem...need advice please SN95 4.6L Mustang Tech 2
mac16 Got rear ended in my fox, doing a swap need feedback and advice! 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 4
I Need some advice...rear end problem SN95 4.6L Mustang Tech 4
blacknblue2002 Need advice on rear end build SN95 4.6L Mustang Tech 5
O Need advice on rear window vinyl SVT Tech Forum 9
killer medic Need Rear End Advice!!! Classic Mustang Specific Tech 8
M Ad in newspaper. intake & rear end. Advice needed 1974 - 1978 Mustang II Talk & Tech 5
D I need some advice on a Rear Main Seal install. Fox 5.0 Mustang Tech 7
belzebub2u need some rear end advice 1994 - 1995 Specific Tech 6
iwannarace67 need advice on rear end swap... Fox 5.0 Mustang Tech 2
spree need some rear suspension advice SN95 4.6L Mustang Tech 2
F Advice needed for Foxbody build 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 26
ndfox92 diagram or advice needed. i hate electrical. Fox 5.0 Mustang Tech 6
HeatShield '89 LX Forged 347 in Need of Advice (Fuel & ECU) Fox 5.0 Mustang Tech 8
R Engine Need advice Fox 5.0 Mustang Tech 9
R Hello im new, i need some advice 2.3L (N/A & Turbo) Tech 2
A New fox owner, idle issues need some advice Fox 5.0 Mustang Tech 20
8 Progress Thread diving back into my 87 lx after a 10 year hiatus need some advice 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 9
Madness7645 Need advice - small cracks on block from water jacket to head bolt hole 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 10
5 NEED ADVICE FROM COMMUNITY MEMBERS 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 8
U Engine Replacing the gasket on a gt40 head need some advice Fox 5.0 Mustang Tech 36
4 98 STANG, NEED ADVICE The Welcome Wagon 2
T 64.5 D code auto to 4 spd manual trans swap advice/info needed Classic Mustang Specific Tech 4
B Engine Crank no start 99 gt 4.6l supercharged. Advice needed SN95 4.6L Mustang Tech 5
J New to the forum and need advice on getting a 5.0 started after sitting for about 3 years Other Auto Tech 3
7 Need advice other than its a ford.my son purchased a 94 mustang gt 5.0 he was driving earlier and it dies now no fire 1994 - 1995 Specific Tech 8
E Rebuilding need advice as to what kit I should get and what bore 1994 - 1995 Specific Tech 19
N Need advice!! 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 7
Woody3882 Need Exhaust electronic cutout advice/opinions 1965 - 1973 Classic Mustangs -General/Talk- 6
MachUno Drivetrain Rookie here! I need your Bracket car advice, tips and 2 cents worth. Fox 5.0 Mustang Tech 11
S New 94 5.0 build layout. Need advice! 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 5
C Need a little advice on 2000 3.8 to 5.0 swap. 1996 - 2004 SN95 Mustang -General/Talk- 7
HighLife7 Upper door belt line trim advice needed 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 21
L Need Technical advice Fox 5.0 Mustang Tech 34
C Wheels-Tires Please help, advice needed. 2015+ (S550) Mustang -General/Talk 4
G New guy from Ohio The Welcome Wagon 6
Mustangbadboy Need some advice... 1996 - 2004 SN95 Mustang -General/Talk- 0
J Need some advice... 1996 GT Conv. 1996 - 2004 SN95 Mustang -General/Talk- 2
Alldegree Fox Fox Body Frame Rust-- Scrap or Save? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 203
1 Need advice/thoughts on 68 coupe roof repair 1965 - 1973 Classic Mustangs -General/Talk- 15
D Need advice 2005 - 2014 S-197 Mustang -General/Talk- 6
O 04' GT. Multiple advice bullets needed 1996 - 2004 SN95 Mustang -General/Talk- 1
Similar threads