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I'm thinking about installing a set of 3.55 gears from 3.31. Right now my car has a C&I cai and a 93oct tune with an auto and stock 18in rims . In other words its stock . The thing is I want to improve the car but do not intend to put in 3.73 or 4.10 . Just a slight improvement with 3.55 . Is this worth it to install 3.55 gears over the 3.31 gears.
I'm thinking about installing a set of 3.55 gears from 3.31. Right now my car has a C&I cai and a 93oct tune with an auto and stock 18in rims . In other words its stock . The thing is I want to improve the car but do not intend to put in 3.73 or 4.10 . Just a slight improvement with 3.55 . Is this worth it to install 3.55 gears over the 3.31 gears.
You could gear the car to run at a certain RPM while crusing down the Eway. What speed do you want to cruise at? What RPM's? How tall are your rear tires in inches (probably 26in)? If you can fill in the blanks I can tell you what gear you can run and still have the car cruise down the Eway the way you want it to. You should be able to run 3.73's and maybe 3.90's and still have a docile car that gets good milage.
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You can't make everyone happy, so I don't try. You'll get over it.
You should also think about what you intend on doing with the car as far as mods down the road. Gears are a fairly expensive upgrade. I personally would not spend the money to only go to 3:55. For an auto, I would go 4:10 if I were going to spend the money. If you are planning on FI in the near term, you may want to consider dropping back to 3:73 depending on the amount of boost that you may run. I ran 3:73 on my last Foose with a Manual without boost and I was happy. It would still lay about 10' of rubber going into 2nd. I am running 3:55 now with a Whipple and manual again and could stand to go back to the 3:73s. With an auto, you could stand to go a little steeper and still keep the traction under control so you may want to consider the 4:10.
Also consider the type of driving that you will be doing with this car. Is it a daily driver? If so, is it used on a lot of interstate of highway speeds of 70 mph? If so, consider then the higher RPM = higher wear and higher fuel consumption. That may not be an issue for you and only you can make that decision. Good luck on which ever gear set you choose.
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Victor
2007 Foose Stallion
FRPP Polished Whipple SC - 8lb boost, FRPP Hot Rod Cams (M-6550-3V), FRPP Ceramic Coated Shorty Headers, FRPP Tuned Racing Suspension, FRPP Tuned Racing Exhaust, FRPP Axle Back, Steeda TriAx, Nexus Series - AFM, Vac/Boost, Fuel Pressure, Speed of Sound Dash Pod, Raptor Blue LED Shift Light. 424 RWHP 387 TQ
likely feel nothing from 3.55s is what I wanted to know... What I want is every day driving without forced air (cannot afford). I want to improve the car a little here and there. Start with cai, gears, udp, aluminum drive shaft, 555r nitto street tires at around 26in to 27in followed by taking to the local dyno for a tune. Here's the thing I cant afford a blower and the main reason I didn't want to put steep gears in is because of the wine. Just last night my wife was asking me what that noise was and it was the 3.31 gears wining from the factory and i've owned a 73 firebird 3.73 gears and all it did is wine. Fast but lots of wine. Actually my goal is 12.99ET at the track.. Someday...Am I dreaming?
likely feel nothing from 3.55s is what I wanted to know... What I want is every day driving without forced air (cannot afford). I want to improve the car a little here and there. Start with cai, gears, udp, aluminum drive shaft, 555r nitto street tires at around 26in to 27in followed by taking to the local dyno for a tune. Here's the thing I cant afford a blower and the main reason I didn't want to put steep gears in is because of the wine. Just last night my wife was asking me what that noise was and it was the 3.31 gears wining from the factory and i've owned a 73 firebird 3.73 gears and all it did is wine. Fast but lots of wine. Actually my goal is 12.99ET at the track.. Someday...Am I dreaming?
... Carlos of Advanced Auto Repair
Not a "Stock" car but a Stock/untouched engine.
11.75@114 @ Fords @ Etown
1.52 60' on a slick.
It's a manual and it's totally gutted but it is naturally aspirated.
I saw him at Eatontown this past fall.
He listed his mods on another forum.
Quote:
...
06 mods
AAR lightweight radiator support
Pulleys
Short belt
Shorty headers
off road x pipe
OEM clutch
Aluminum flywheel
Weld 15" wheels
1 piece steel driveshaft
Front and rear lower control arms
Roush springs (modified by AAR)
Stock original shocks and struts
Line loc
Short throw shifter
2 step launch control
Cold air intake (Modular Depot)
SCT x-cal2 tuned by AAR
IMRC eliminator plates (not port matched)
4:56 gears
GT 500 throttle body
AAR lightweight rear brake assembly
Light weight front brake assembly
Slicks and skinnies
Battery in stock location (Not OEM battery)
3200 pounds with driver
1 Kirkey seat
...
I have a stick, and went from 355s to 373s. Not much of a difference.
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07 GT. Exterior mods n/a. Engine mods, see profile.
One of the more powerful cars around.
One of the slower cars around.
Makes me feel like a kid every time.
i started with 3.73's and didnt really notice enough to make it worth the money. so i dropped even more money again and got 4.10's. the 3.73's were nice cause it really didnt seem to change my highway driving, but it had a little extra umph! off the line. Save your money and dont waiste it on 3.53's your not going to notice a big enough difference.
If it's a highway car I would think 3.73s would be perfect. You would likely feel nothing from 3.55s...
One of my next mods is going to be gears... originally I wanted 4.10's but I had always heard if you do a lot of highway driving then avoid them....
Well idk if my daily actually sees "highway's" my daily route consists of about 3 miles of back roads 45-50 mph, 15 miles of 55-65mph which has 3 stop lights along the way, and about 2 miles of stop and go traffic 35-40mph....
So idk if that is considered a lot of highway miles or not.. the car never really sees average speeds over 65mph unless its an occasional passing at about 70-80..
One of my next mods is going to be gears... originally I wanted 4.10's but I had always heard if you do a lot of highway driving then avoid them....
Well idk if my daily actually sees "highway's" my daily route consists of about 3 miles of back roads 45-50 mph, 15 miles of 55-65mph which has 3 stop lights along the way, and about 2 miles of stop and go traffic 35-40mph....
So idk if that is considered a lot of highway miles or not.. the car never really sees average speeds over 65mph unless its an occasional passing at about 70-80..
So any advice on that would be great...
We were talking more of Interstate driving where posted speeds are 65 - 70 and people drive about 10 over that. Like for me, I have a brother that I visit about 4 hrs away where most is Interestate. I would be hesitant to run 4:10 gears if I were going to make that trip regularly.
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Victor
2007 Foose Stallion
FRPP Polished Whipple SC - 8lb boost, FRPP Hot Rod Cams (M-6550-3V), FRPP Ceramic Coated Shorty Headers, FRPP Tuned Racing Suspension, FRPP Tuned Racing Exhaust, FRPP Axle Back, Steeda TriAx, Nexus Series - AFM, Vac/Boost, Fuel Pressure, Speed of Sound Dash Pod, Raptor Blue LED Shift Light. 424 RWHP 387 TQ
I say the manuel tranny's need 3.73
the Auto's need 4.10s
4.10's in the Auto is fine for highway driving. It will hurt the MPG but the seat of the paints feel is worth it
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Saleen S/C 3.4 pulley tuned by JDM Engineering, GT500 pumps, CHE goodies on the rear, 4.10's, KOOKS/ high flow catted X pipe with PYPES Violators, Spydershaft, TCI 3500 stall, PA deep tranny pan. Meziere w/p,M&H 325/45/17 DRs.
future mods.... a 3.0 pulley
3.55 gears with auto? 
