Gear Ratio ? - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 13 Old 08-13-2005, 02:57 PM Thread Starter
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Question Gear Ratio ?

I have an 88gt with a 5-speed and a basically stock motor. I currently have 3.08 gears, but I want to switch. I "think" I want to go with 3.55's but I may consider 3.73's. The car is driven on the highway a fair amount but I intend to do some auto-x as well as some HPDE driving. What gear ratio would work best for an "average" auto-x course? For anyone who has swapped from 3.08 to 3.55, was it "enough" of an improvement, or did you wish you went taller. Thanks.

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post #2 of 13 Old 08-13-2005, 04:25 PM
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i went 3.55 and i wish i had gone 3.73. go 3.73!


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post #3 of 13 Old 08-13-2005, 05:24 PM
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I think 3.55's are probably enough with the stock T-5. I have 3.73's and I'm usually okay with them at autox, but any course with a decent straightaway and I start to hit the limiter.
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post #4 of 13 Old 08-13-2005, 08:55 PM
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A 3.55 will be fine with a stock engine and also keeps you in a street prepared class (ESP). The 3.73 knocks you up to street mod (SM), a place you don't really want to be in a Mustang. I still have the 3.55 in my ESP 95 Cobra and with good tires I can do rather well with it.
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post #5 of 13 Old 08-15-2005, 01:28 AM
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I would just leave well enough alone until you come up with a complete plan. No point in doing it twice.
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post #6 of 13 Old 08-15-2005, 10:29 PM
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Get the gears. My 3.55s were one of my best mods. I liked them when I was near stock and when I got heads, cam, and intake. I think they would be ok if I put a supercharger on the motor. I am going to 3.27s and a Tru-Trac (or Torsen) once I get my turbo installed.
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post #7 of 13 Old 08-16-2005, 12:18 PM Thread Starter
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Thanks for the replies guys, please keep them coming! I actually do have a plan. So far the engine has limited bolt on mods. Down the road I plan to do H/C/I, with the goal being around 300rwh. So far I have done a fair amount of suspension work. Now I'm getting ready to do a rear disc conversion(with fronts coming later), so with the axles coming out I figure that now is the time to change my gears; I just have to decide on a ratio. So far it sounds like going with 3.55's is the best compromise for street/highway driving, while 3.73 might be a little tall for an auto-x course. Any other opinions? Thanks.
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post #8 of 13 Old 08-16-2005, 08:50 PM
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I had 3.08's and went 3.55's and love it. I'm doing everything you said you do with the 3.55's and still keep low RPM's. 3.73 are to much on the freeway and on the track you well your limiter.
My vote is 3.55

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post #9 of 13 Old 08-17-2005, 03:55 PM
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I went from 3.08 to 3.73, doing OT events, I wish I went with 3.55s.

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post #10 of 13 Old 08-18-2005, 11:30 AM
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I had stock 2.97's at first. Changed them too 3.73's and didn't like the power band once I started doing the H/C/I and exhaust. Went too 3.55's and loved it. This was all done with a stock 87 T-5 tranny.
Tried to use the 3.55's in my Viper tranny, but first gear is way to steep. Had to go with 4.10's and love it now.

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post #11 of 13 Old 08-18-2005, 02:56 PM
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I went with 3.55's back in 91, I wish I went with 3.27's with my 5spd. On long straights like TWS I run out of gear in 4th. I either have to stay at red line or bog in 5th. Now if I had a .8 5th gear, 3.55 might be better. Also it seems to me that with 3.55's I am either to low a gear or to high a gear. YRMV.

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post #12 of 13 Old 08-18-2005, 03:40 PM
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I'm using 3.73 gears and with the 2.87 1st and .82 5th in my TKO it all comes together rather nicely. The car pulls away well in 1st without having to immediatley upshift to 2nd and on long straights I can shift into 5th without the engine bogging.
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post #13 of 13 Old 08-18-2005, 10:12 PM
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Having had 3.55s, driven a friend's with 3.73s, and owned a car with 4.11s, I like the 3.55s best in a relatively stock 5.0 seeing lots of street miles.

IMO, best mod you'll make BTW.

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