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Old 08-02-2012, 09:27 AM   #36
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Re: 3.73 Gears

adding a data point: Any gear except 3.73 makes the deep overdrive 6th all but useless. Car moves adequately on 3.73 + Procal tune in 6th but on the stock tune it would barely pull the skin off rice pudding.

I bought 3.73s with the car and do not regret the purchase one bit. The car hammers hard right out of the gate with good traction, once you do something to deal with the wheelhop, which is particularly brutal on the Brembo cars.
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Old 08-02-2012, 01:03 PM   #37
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Quote:
Originally Posted by 5LHO
adding a data point: Any gear except 3.73 makes the deep overdrive 6th all but useless. Car moves adequately on 3.73 + Procal tune in 6th but on the stock tune it would barely pull the skin off rice pudding.

I bought 3.73s with the car and do not regret the purchase one bit. The car hammers hard right out of the gate with good traction, once you do something to deal with the wheelhop, which is particularly brutal on the Brembo cars.
Why brembo cars
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Old 08-02-2012, 01:12 PM   #38
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Re: 3.73 Gears

Short, stiff sidewall tire and big, fairly heavy wheels make for a good increase in the wheelhop present in every stock-suspended S197 car since the beginning of time.

Frankly, I've had 4 mustangs, starting with a '68, two Foxes, now this, driven every generation of this car I haven't owned at least once; you'd figure Ford woulda got ahold of this problem by now but, they all had it, in varying degrees and, they all needed aftermarket help to cure it.
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Old 08-02-2012, 01:34 PM   #39
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I got ya makes a lot of sence didn't think about it like that ima a Chevy guy just I've alway like the mustang my mom had to.fox 5.0s but I was younger and didn't drive either lol but I liked the 2005 models and loved the 10 and I'm truly in love with this 5.0 only... one complaint my dam.neck hurts from the acceleration lol
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Old 08-02-2012, 02:50 PM   #40
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Re: 3.73 Gears

Just so you don't feel bad, the Camaro and the Trans Am I had wheelhopped, too.....:^)
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Old 08-02-2012, 04:27 PM   #41
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U know wat I had a 96 camaro z28 and it.did.have bad wheelhop u right come to.think about it my ss monte Carlo did too Lmao
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Old 08-02-2012, 04:34 PM   #42
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My 94 Z28 never wheel hopped
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Old 08-02-2012, 06:01 PM   #43
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My 94 Z28 never wheel hopped
Maybe mine was faster lol
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Old 08-03-2012, 01:28 AM   #44
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So witch gear do u guys prefer 331 or 373 and why I don't take it to the track just street driving

---------- Post added at 04:59 PM ---------- Previous post was at 04:59 PM ----------



I have a brembo car also
I find the best overall gear for these cars to be 3:55
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Old 08-03-2012, 09:58 AM   #45
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Re: 3.73 Gears

Can't disagree there. I'd just say 3.73s are fine, even on long trips, because of the deep overdrive on the car. They are pretty steep though, say, for foul-weather conditions and require a gentler touch.

Going back to the OP's original question: No, don't change your 3.73s. leave them as they are. They'll be fine for all around. Anything taller, like 4:10s, has serious downsides, anything shorter, like 3:31 is going to feel weaker running around and doesn't justify the expense, unless you're going serious FI.
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Old 08-03-2012, 10:58 AM   #46
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Re: 3.73 Gears

In the short time I've had my '13 the 3.73s have been fine. 1st gear is short, but it gets off the line nicely. 6th cruises at about 2k-ish on the freeway. Seems like a good compromise on both ends. Once I get it out to autox I'll see about the other issues.
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Old 08-03-2012, 11:29 AM   #47
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Re: 3.73 Gears

Quote:
Originally Posted by 5LHO View Post
Going back to the OP's original question: No, don't change your 3.73s. leave them as they are. They'll be fine for all around. Anything taller, like 4:10s, has serious downsides, anything shorter, like 3:31 is going to feel weaker running around and doesn't justify the expense, unless you're going serious FI.
I have stock 3.31 now and am considering swapping to 3.73 to match up with the Boss intake's higher rpm power.
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Old 08-03-2012, 11:43 AM   #48
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Re: 3.73 Gears

My mistake, I misread your original question. In that case yeah, the switch would be warranted.
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Old 08-06-2012, 08:31 AM   #49
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Yes you will. I ran 7 times down the track 2 weeks ago. Hit rev limiter in 4th early every time. Trap speed 110.8 coasting through.
Interesting, that is right where you should run out of revs in 4th with the stock tire size, but I haven't heard of anyone else hitting the limiter. You stock otherwise? Mind posting a slip or your 60' and et?

---------- Post added at 09:31 AM ---------- Previous post was at 09:24 AM ----------

Also keep in mind that when most people are running numbers for 3.73 or 3.90 gears on the quarter, they are running them for 28-29" tall drag radials. This has a significant effect on the effective gear ratio.
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Old 08-06-2012, 09:33 AM   #50
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My 60's were all in the 2.10 range, fastest E.T. for the day was 13.10 ( I felt good about the run times, as there was a C6 w/ minor mods that couldn't run faster than 13.36 all night). I'm sure with a taller tire and Boss intake w/ raised RPM limit it would be just fine, but as-is it peter'd out every time short of the finish line. I thought about short-shifting to 5th, but don't think there would be any gain in E.T. from the lag time between the 4-5 shift; maybe a gain of a couple mph but that's it.
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Old 08-06-2012, 09:45 AM   #51
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Originally Posted by Compstall
My 60's were all in the 2.10 range, fastest E.T. for the day was 13.10 ( I felt good about the run times, as there was a C6 w/ minor mods that couldn't run faster than 13.36 all night). I'm sure with a taller tire and Boss intake w/ raised RPM limit it would be just fine, but as-is it peter'd out every time short of the finish line. I thought about short-shifting to 5th, but don't think there would be any gain in E.T. from the lag time between the 4-5 shift; maybe a gain of a couple mph but that's it.
Yeah I doubt you would gain anything either. Sounds like that c6 driver was a pile of fail, you should have gotten a video of him lol.
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Old 08-10-2012, 12:29 PM   #52
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Re: 3.73 Gears

iv got 3.73s and 28" tire and never had to go into 5th with em.

You guys think with the 255/60r15 youd have to go into 5th?? its a 27" tire. Some guy around me is selling a set with 3 runs wicked cheap.....hmmmmmm
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Old 08-10-2012, 12:41 PM   #53
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That's a tough question to answer, I know there are a few charts and link that have been posted on here, try searching and let us know what you find
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Old 08-10-2012, 12:51 PM   #54
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Depends on power levels. What are you trapping at?
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Old 08-10-2012, 12:55 PM   #55
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Im with those on needing 3.73 for 6th if ur staying na. This is my 3rd s197 and its the only one that doesnt/didnt suck wind in top gear b/c its the only one Ive had w/ 3.73s.
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Old 08-10-2012, 06:25 PM   #56
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Re: 3.73 Gears

bearings are bad when you disassemble,,what..sounds like a scam..

---------- Post added at 05:25 PM ---------- Previous post was at 05:11 PM ----------

So your saying 373 are not good with the supercharger..I have 331 auto..06 model..Im not getting the charger until a year from now but i was going 373..You think 355 are better..I was going with the 550 ford super kit
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Old 08-10-2012, 06:33 PM   #57
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Originally Posted by mymustang
bearings are bad when you disassemble,,what..sounds like a scam..

---------- Post added at 05:25 PM ---------- Previous post was at 05:11 PM ----------

So your saying 373 are not good with the supercharger..I have 331 auto..06 model..Im not getting the charger until a year from now but i was going 373..You think 355 are better..I was going with the 550 ford super kit
Might be able to swing 3.73s with an auto since that's similar to 3.55 with a manual. Still gonna be pretty steep for a blower, depending on what you go with. Have you picked out a model or have power level/et goals?
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Old 08-10-2012, 07:30 PM   #58
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Re: 3.73 Gears

I planned with the fords 550 hp supercharger kit..they dont recommend it for the auto,,since its a 400 hp auto,,but i can rebuild it if it goes..with some upgrades..Im still new about the chargers but ive been reading on them..I like the ford kit because evrything comes matched..But itll be a year before i get it ,,im trying to do the other stuff first..Headers, changing gear,lowering kit..etc..I gotta a sct tuner right now,,which can be changed while doing the small stuff,,but you have to get a whole different program,,when you go with the super charger kit...I think they use the whipple..But i dont want to slow it down if the gears to steep..for the charger..low 11s would be nice,,but i want to drive it on trips too..I also like the charger because even though you have the power you can drive it normal,,
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Old 08-10-2012, 07:35 PM   #59
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Auto trans is probably fine, you'll need a stall though I believe. There was a guy on here that knew a ton about it, but they banned him. If you pm me ill give you his name so you can look up his old posts.
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Old 08-10-2012, 08:18 PM   #60
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Re: 3.73 Gears

Yea i looked at the 2500 stall..Im funny about aftermarket conveters but ford doesnt have one ..stall converter that is..Alot of the TCC lock clutches are not good on after markets..But i read on a couple and got some feedback..I had a 3000 stall back in the day with a couple of radical small block chevys..It wasnt to bad driving it normally,,so im betting the 2500 isnt to bad..plus anything bigger will blow out tires to bad..But i was going to get the charger kit first see how the stock auto does...But if it helps i can go ahead and put one in with it
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Old 08-27-2012, 11:20 AM   #61
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Re: 3.73 Gears

i have a brembo pkg also, just switched from 331 to 373. i had the boss 302 w 331 and now 373. difference is huge, car makes so much power and no low end loss to speak of. IMO boss isnt worth it unless you go 373 and then you will fly!!

---------- Post added at 12:20 PM ---------- Previous post was at 12:16 PM ----------

oh and at 70mph on the highway 6th gear w/ 373s puts me at around 2100 rpm. which is perfect b/c with the 331s i was lower and in a DRONE zone!
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Old 08-27-2012, 11:21 AM   #62
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Originally Posted by MikeC
i have a brembo pkg also, just switched from 331 to 373. i had the boss 302 w 331 and now 373. difference is huge, car makes so much power and no low end loss to speak of. IMO boss isnt worth it unless you go 373 and then you will fly!!
Agreed, boss is a tough sell with lower gears.
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Old 08-28-2012, 09:14 AM   #63
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Re: 3.73 Gears

Oh, great. Now make me think about it again for the future. You're no help.
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Old 05-16-2013, 08:20 AM   #64
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so, what would you guys recommend for a 12' GT 5.0 w/ a Roush SC Phase III? the gears are 331 & the hp from the SC is 675. should i stay w/ what i have or 373's would be a better match for the 1/4?
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Old 05-16-2013, 08:32 AM   #65
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so, what would you guys recommend for a 12' GT 5.0 w/ a Roush SC Phase III? the gears are 331 & the hp from the SC is 675. should i stay w/ what i have or 373's would be a better match for the 1/4?
I have the same setup as you at the moment. I didn't want 4.10 because I THINK I'd have to shift to 5th at the track, I THINK. However, my track is closed now so track will no longer be a privilege for me. So since I'm making it a street car 4.10s will be a lot of fun. So that what I'm going with next month.
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Old 05-16-2013, 08:42 AM   #66
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You'll be in 5th with 3.73s as well, unless you put mudder tires on the back.

That much power in a Mustang's weight should have you blowing through the 1/4 at conservatively, 120+ mph plus with easy 11 second ET on street tires. You'll probably get heaved off the track for no cage or safety equipment at the speeds the car will be capable of.

I'd stay with 3.31s on a car with a positive displacement blower, as there's not enough tire to hold that with 3.73s.
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Old 05-16-2013, 02:20 PM   #67
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You'll be in 5th with 3.73s as well, unless you put mudder tires on the back.

That much power in a Mustang's weight should have you blowing through the 1/4 at conservatively, 120+ mph plus with easy 11 second ET on street tires. You'll probably get heaved off the track for no cage or safety equipment at the speeds the car will be capable of.

I'd stay with 3.31s on a car with a positive displacement blower, as there's not enough tire to hold that with 3.73s.
This might be enough tire.

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Old 05-16-2013, 05:48 PM   #68
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You should replace the bearings. I just had gears instal with ALL new bearing, and the gears wined, For the second instal I bought another set of gear and ALL new bearing again. You will need the 2 pinion bearing for sure, Why would you want to reuse the old one's.

A lot of work to change the bearing for you not to spend $80 on new bearing from fordracing.com
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Old 05-19-2013, 07:59 PM   #69
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so, what would you guys recommend for a 12' GT 5.0 w/ a Roush SC Phase III? the gears are 331 & the hp from the SC is 675. should i stay w/ what i have or 373's would be a better match for the 1/4?
I thought 3.73 would be perfect N/A but my car runs out of gear in 4th just short of the finish line (tall slicks would fix it); an s/c'd car would be better off w/ the 3.31's for sure, otherwise you WILL be using 5th gear.
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Old 05-20-2013, 07:05 AM   #70
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thanks so much guys - ok, i will stay w/ the 331 & maybe look at suspension a bit. as the front of the car does rise up on gear changes now. no wheelies, but, it's an obvious "buck"
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