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#1 |
Registered Member
Join Date: Nov 2001
Location: Scappoose, OR
Posts: 42
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![]() Which to go with? I have the stock 2.73s and I'd like a little more kick, but I'm still driving this car 60-70 miles a day, so gas mileage is a concern. I won't be drag racing (except when those imports try to pass me on the right), but as I make a few mods I plan to do some autocrossing. Is there a noticeable gas mileage or performance difference between the two? Thanks.
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91 GT - White, MAC cold air induction (that's it so far) 69 GT - Winter Blue, 351, C-4, mild mods 69 Mach I - Acapulco Blue, 351, T-10, bone stock |
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#2 |
Registered Member
Join Date: Nov 2001
Location: SanAntonio, Tx
Posts: 734
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![]() i went from 3.08 to 3.27, notice a very little difference in mileage or performance, but i didnt want 3.73 at the time, i like to cruise around 80 mph and stay under 2500, but on the strip id like some 3.55-4.10's.....oh well.
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Police package 5spd 90 Lx, Stock original motor, 3.27grs, BM fan, fms 10.5 clutch, D&D quadrant, and adjuster, ADS chip, 180 stat, mac cai, mac h-pipe, mac subframe connectors, ASP crank pulley, ripper shifter, 26x10.5 M/T sport pros welds. 246 hp according to analyzer ![]() Race weight: 3,120 E.t-13.57 with 26x10.50's e.t. streets. 1.88 60' mph- 99.92 mph |
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#3 |
Mustang Maniac
Join Date: Sep 2000
Location: GA, U.S.A
Posts: 2,266
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![]() Scappoose, 5-speed or 4 speed? If you have a T5, go with the 3.55s.
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351W-powered 1979 Ford Mustang Ghia notchback '79 Video @ Idle Stock 5.8L under 4" cowl 'glass hood, C4 w/ Transgo shift kit, Holley 750 cfm, Edelbrock Performer RPM intake; Fluidyne Al radiator, Flexalite 175 electric fan, 1 5/8" MAC shorty headers, FRPP Al driveshaft; S&W 6-point cage; 2.5" Off road H-pipe, 2-chamber Flowmasters, 8.8" Rear w/ 3.55s; Weld wheels (15x6;15x8), Front: 225/60/15, Rear: 275/50/15 Nitto NT 555R Drag Radials; 14 x 4” K&N X-stream air filter. '92 GT (5-speed) Small In Car Video Stock 5.0L, 2-chamber Flowmasters, MAC CAI, Tri-Ax, Al pedals... "Red, thou art my companion. Hasten now your quickened metamorphosis to Green that I may conquer all who dare abide there beside me. May they be left thither behind burnt black." ---Fox Body |
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#4 |
Registered Member
Join Date: Nov 2001
Location: Scappoose, OR
Posts: 42
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![]() Sorry. 5-speed. And for now, other than cold-air induction, bone stock.
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91 GT - White, MAC cold air induction (that's it so far) 69 GT - Winter Blue, 351, C-4, mild mods 69 Mach I - Acapulco Blue, 351, T-10, bone stock |
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#5 |
Registered Member
Join Date: Oct 2001
Location: balto., Md United States
Posts: 32
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![]() When my car was pretty much stock i went with the 3.55's and i love them. i have an aod, and i spend alot of time on the roads everyday and the gas mileage isnt that bad.
id go with the 3.55's |
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#6 |
Undescribable
Join Date: Sep 1998
Location: Ft Myers Fla
Posts: 1,539
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![]() go with the 3.55's and don't worry about your mileage dropping. I have 3.73's and i get 25 m.p.g at 70-75 m.p.h.
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Rice Haters Club Member #101 |
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#7 |
Registered Member
Join Date: Mar 1999
Location: Arcadia, CA, USA
Posts: 731
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![]() I have 3.27s. As said above, they're great for freeway crusiing at 80+. At the strip, you'll wish you had 3.55s or stronger. I guess it depends on how much time you'll be at the track. I'd make a selection based on where you'll be spending the most time...street or track.
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Russ L '91 LX - 331 w/ Procharger '03 Cobra Convertible - Pullied '94 Lightning '65 Mustang Coupe |
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#8 |
Registered Member
Join Date: Nov 2001
Location: Scappoose, OR
Posts: 42
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![]() Not too much occasion to go 80+, or even 70+. 70 is about max on I-5. Too many cops around Portland/Salem/Eugene. And they pull you over in a second. At least they do me.
3.55's sound like the way to go. Thanks for all the input.
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91 GT - White, MAC cold air induction (that's it so far) 69 GT - Winter Blue, 351, C-4, mild mods 69 Mach I - Acapulco Blue, 351, T-10, bone stock |
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#9 |
Registered Member
Join Date: Nov 2001
Location: Dover, DE
Posts: 70
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![]() 3.73's are not too bad. I would go with them. You won't be dissapointed.
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-- -1991 LX 5.0 Sedan, 5 spd (new 'Z' tranny), 3.73, aluminum DS, Hedman headers, 190 LPH, MAC CAI, Flowmaster catback. (170K miles on motor) Best ET: 14.434 @ 96.04 MPH - 2.205 60' (Radials) My Notch |
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#10 |
Registered Member
Join Date: Nov 2001
Location: Sunny, Hot, Sebring, Florida
Posts: 725
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![]() I've had every 8.8 gear from 4.30's down and i can tell you that 3.55's are the worst draggin gear, go with 3.73's
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Remember...2nd place is 1st place for losers! |
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#11 |
Registered Member
Join Date: Nov 2001
Posts: 30
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![]() 3.73's all the way baby!
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"Viva para lutar, lute para viver" |
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#12 |
Registered Member
Join Date: Nov 1998
Location: Sugarland, TX USA
Posts: 161
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![]() My 3.27 gear is not too bad at the track! 1.394 60', 10.324 et...
Really it depends on what you want to do and how you are set up. For your particular application I would stay with the 2.73. If you are not going race anybody from zero why change gears? From a roll the 2.73 will be just as good as a 3.73, maybe better depending on speed. One concern is your clutch. It will last longer with a lower gear. Takes less slippage to get you moving the lower the gear. A 3.55 or even 3.73 would be a good street/track compromise if you planned to race at the track.
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88 347, Twisted wedge heads,Comp Cams 224/230 cam, 1/4=10.324 @ 126.95, 60' = 1.394 http://xs-fx.com/raughammer/larrysample.htm |
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#13 |
Registered Member
Join Date: Sep 2000
Location: Lafayette, Indiana
Posts: 120
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![]() I have had 3.73's and the 3.55's in my car. For driving on the street, 3.55's are the way to go.
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89 GT convertible, Kenny Brown level 5, Edelbrock performer, AFR 165's, Comp cams XE270HR, C&L 76, 24# inj, Crane 1.7's, 70mm BBK throttle body 298.2 hp 328.2 tq Mustang dyno "Our lady of blessed acceleration don't fail me now" Elwood Blues |
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#14 |
Backyard Mechanic/Chemist
Join Date: Feb 2001
Location: Acton MA USA
Posts: 435
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![]() My 2.73 are just sooo tall, sometimes I have to downshift to 4th on the highway cus 5th is geared to about 250 mph at 6000 rpms.
3.73's will certianly hurt your highway mileage compared to the 2.73's no matter what the other guys say. For a mostly stock motor going higher than 3.55 with a T-5 may slow you down since the motor would run out of breath at the end of the 1/4 mile. If you have a intake swap this will greatly improve the high rpm breathing and make the 3.73 or 4.10 more usefull
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2001 Crown Vic Maurader Airbox/MAF, DR chip Edel IAS shocks Single exhaust :wtf: 93 P-71 Vic interceptor Backup car now 90 5.0 LX Notch SOLD 74 Chevy Laguna type S-3 454 under construction Currently apart undergoing bodywork. |
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Thread | Thread Starter | Forum | Replies | Last Post |
3.55 gears. | 66StangGuy | Classic Mustangs | 6 | 08-12-2002 02:40 PM |
3.55 vs. 3.73 | TwiLighTBluEGT | Windsor Power | 8 | 06-21-2002 12:44 PM |
3.55 or 3.73? | DemonGT | Windsor Power | 17 | 06-15-2001 01:54 AM |
3.55, 3.73 or 4.10 | Mouse Eater | Windsor Power | 12 | 01-15-2001 08:03 AM |
3.25 or 3.55 | Rizz67 | Classic Mustangs | 2 | 01-03-2001 11:12 AM |