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View Full Version : 3.27 vs 3.55 rear gears; which is better?



bernie lomax
11-16-2009, 07:04 PM
I understand that this a subjective question which depends on the driver, goals, etc. but here's the question anyway...for a 90 SC 5 sp, to swap out the existing stock rear gears (2.73), which ratio strikes the balance better between seat o pants performance & reasonable hwy revving, the 3.27 or the 3.55...overdrive in the M5R2 5th gear is .75....City & Hwy driving will probably be split approx. 50/50...mild mods to the car are anticipated (exhaust, pulleys, intake system, etc.) your votes & opinions are appreciated

ricardoa1
11-16-2009, 07:48 PM
If you are not modding past 300Rwhp then 3.27 will provide you with some nice umph. 1st will be short but still usefull. Over 300RWHP then stick with a 3.08 or stock ratio. Do a search it has been discussed many times.

You will loose MPG as you go up since 5th will keep getting higher in the RPMs when on the highway.

T-bird4vr
11-16-2009, 08:27 PM
yeah, 90 trans with 350 rwhp and 3.55's was a bit much, doable, just plenty agressive.

thunderkid84
11-16-2009, 08:57 PM
if u ever go to the track with 3.27's, hooking will be a b**ch

http://www.sccoa.com/forums/showthread.php?t=108066

slowpoke
11-16-2009, 11:41 PM
never been in a t-bird with 3.55's yet but i did put the 3.27's in mine. they are alot of fun and to me they handle great on the interstate (60-80mph). and yes ill agree with everyone that with my 5 speed it is hard to get the tires to lock up with street tires. did 3 fuel level to odometer millage test on it and getting an average of 24mpg highway. didnt do city yet.

Duffy Floyd
11-17-2009, 12:00 AM
You have to consider who you are getting your advice concerning gears from. Why you ask? If you get the answer from a guy with a 94/95 trans there answer could very well be different than a person with an early model trans. The reason being is the start-up ratio for a late model with 3:27 gears is 3.42 X 3.27 = 11.1834. Now if you look at the same gears with an early model trans you have 3.27 X 3.72 = 12.1644. The difference in percentage is 8% so the perceptions in the seat of the pants is different as well as how much "gear" you have. Personally I feel for me that the 3.27 mod. was the worst thing I ever did to my 92 with an early model 5 speed. I had 3.08's in the car when I bought it. Should have stayed with them.

lee1rbc
12-09-2009, 04:46 AM
You have to consider who you are getting your advice concerning gears from. Why you ask? If you get the answer from a guy with a 94/95 trans there answer could very well be different than a person with an early model trans. The reason being is the start-up ratio for a late model with 3:27 gears is 3.42 X 3.27 = 11.1834. Now if you look at the same gears with an early model trans you have 3.27 X 3.72 = 12.1644. The difference in percentage is 8% so the perceptions in the seat of the pants is different as well as how much "gear" you have. Personally I feel for me that the 3.27 mod. was the worst thing I ever did to my 92 with an early model 5 speed. I had 3.08's in the car when I bought it. Should have stayed with them.

Nice post. I think alot of people get caught up in in axle ratio and don't understand there is a total ratio. I used to own a 71 Chevelle with 3.73s. That sounds quick but 1st gear in my trans was 2.52. 2.52x3.73= 9.399 total ratio. My 92 with its 3.72 1st gear x 2.73 = 10.155 total ratio. So if a kid asks me "what gears do yah got in that" I tell them 3.73s LOL.