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Old 03-20-2014, 11:46 AM   #36
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As long as you don't do a lot of long highway driving then 4.10s won't be too bad on the gas. I'm putting my rear with 4.10 in tomorrow and I'll let you knoe how noticeable it is!
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Old 03-20-2014, 11:59 AM   #37
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Make sure to report!!!. When I had my 90 5.0. I swapped between 3:73 and 4;10's once--approx.300 rpms difference when cruising
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Old 03-20-2014, 12:04 PM   #38
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What do you mean report?
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Old 03-20-2014, 12:06 PM   #39
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What do you mean report?
you said u were putting in 4:10's tomorrow. Report how u like them compared to now
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Old 03-20-2014, 12:11 PM   #40
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What do you mean report?
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Old 03-20-2014, 12:16 PM   #41
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ok. tell us how they feel ......... ok?
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Old 03-20-2014, 12:22 PM   #42
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Yeah sorry I didn't realize that's what you were talking about! I'll tell you all the rpm changes an stuff. I don't really keep track of gas mileage though!
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Old 03-20-2014, 12:23 PM   #43
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AND THEN!!!!
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Old 03-20-2014, 12:24 PM   #44
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Yeah sorry I didn't realize that's what you were talking about! I'll tell you all the rpm changes an stuff. I don't really keep track of gas mileage though!
I was thinking "good lord, whats wrong with this guy" lol....
What ratio do u have now?
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Old 03-20-2014, 12:25 PM   #45
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Yeah that's my bad. The stock so isn't that 3.27?
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Old 03-20-2014, 12:27 PM   #46
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yes it should be, well let me know! Me, my brother and nephew are gonna remove 4:10's from my brother 8.8, and install 3:55's. Then we are gonna 'learn' the correct way to do it and then do mine.
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Old 03-20-2014, 12:32 PM   #47
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This should help!!

Basic Info on 7.5 Ford (Rear end in v6 mustangs)
Stock Gear Ratio: 2.73, 3.27
Splines: 28
Oval cover
10 Holes
Open Carrier
Ok everyone suggest gears as a mod, of course its a great one to suggest. By gears people mean the rear end gears. A Lower gear ratio will really help your acceleration, but hurt your top speed. Stock for the 7.5 Ford in the mustangs is 2.73(94-98) and 3.27(99-04), 28 splines. People. By the term "Lower gear ratio" people mean a 4:10 to 3.73, 4:10 is lower. The average gear ratio upgrades are 3.73 and 4:10. There are many different options tho such as 3.45, 3.73, 4.10, 4.56, 5.13. Anything above 4:10's are not street friendly. Going to a lower gear ratio will hurt your gas mileage, but nothing noticeable, it will also hurt your top speed, prolly 130 with 4:10s. The gains will be even greater. They really help out your acceleration and you will have the "Grin Factor" For a week. There is nothing wrong with buying used gears, just check for any chipped teeth or wear.
To help get your power to the wheels you should also invest in a posi unit. The most simple and easiest is a Ford T-Lock. T-Locks are stock in Mustang GT 8.8s. They have clutches inside that can wear out over time. T-Locks are recommended for cars with less Power. If you plan on using any kind of power adder, or going with allot of upgrades A Auburn or Det Truetrac is for you. A locker will do as the name implies, it locks both rear tires for best traction. There are two types, a Locker, and limited slip.
Gears are a very good modification that most people overlook. It doesn't add HP, but it gets you up and going.
A Girdle is recommended for higher powered cars, it gives that added support needed. It also adds to the fluid capacity so your fluids will not run as hot.
With this new found power you will also need to correct your speedometer. If you have a 94-98 all you need is a little plastic recalibrator, for 99-04 you will need a tuner.
A Gear and Locker Installed will run you
Gears(Used) $50
Gears(New) $175
Locker $250-$510
Installation $300
Add ons:
Girdle $140
Axle Shafts $110
Install kit $45
Recalibrator or tuner
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Old 03-20-2014, 01:14 PM   #48
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Ahh, well living in the middle of nowhere Nebraska, I do mostly highway driving. So 3.73 would be the way to go for me.
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Old 03-20-2014, 04:03 PM   #49
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Milehigh is it possible that you could post a video of before an after of the gears? Like a 0-60 pull or something?
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Old 03-20-2014, 11:08 PM   #50
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I could try! Won't the gauges be incorrect without a tune after though?
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Old 03-20-2014, 11:12 PM   #51
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Thanks, you don't need to have the video after the install immediately. As long as you have a 0-60 before they are installed as a base line you can record the after video once the speedo is corrected.
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Old 03-20-2014, 11:15 PM   #52
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Yeah I'll see what I can do. Can I have a mechanic correct it?
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Old 03-20-2014, 11:17 PM   #53
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I haven't had gears changed so I am not the person to ask, but i think Ford dealerships do.
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Old 03-20-2014, 11:18 PM   #54
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They'd probably charge something ridiculous to do it. I should probably get a tuner anyway
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Old 03-20-2014, 11:20 PM   #55
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Yea that will probably be the best idea.
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Old 03-21-2014, 03:18 AM   #56
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I think the 99-04's have an electric speedo. Might be able to get it tuned.
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Old 03-21-2014, 10:13 PM   #57
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got to be done thru a tuner. I 'believe' that shift points may be different till u get a tune or tuner....
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Old 03-21-2014, 11:00 PM   #58
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The autos need to be tuned. The standards you go in and change your tuner to a v-8 rear end. If you have gear you need to change the rev miles. 4.10 with factory tires are 810 rev miles. I do not know 3.73. All the gear/tire ratios were posted in the v-8 section, but the link broke.
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Old 03-21-2014, 11:02 PM   #59
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Well looks like i need I get a tuner now
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Old 03-21-2014, 11:06 PM   #60
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They sell a electric calibrator part to correct the speedometer. Ask in the v-8 section if you do not want to buy a tuner.
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Old 03-21-2014, 11:08 PM   #61
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They sell a electric calibrator part to correct the speedometer. Ask in the v-8 section if you do not want to buy a tuner.

Well I might as well get one. I'll be installing the exhaust soon and the tuner would be next anyway
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Old 03-22-2014, 08:40 PM   #62
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Well I might as well get one. I'll be installing the exhaust soon and the tuner would be next anyway
A tuner is the better bang for the buck. Most people like exhaust according to sound. You will not get much hp from most exhaust set up, but it will sound cool. Eliminating the cats is where most of the hp comes from. Widening the pipes gives you higher hp in the upper rpms.
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Old 03-31-2014, 06:31 PM   #63
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Well this swap has turned into a nightmare
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Old 03-31-2014, 06:32 PM   #64
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What happened? Tuning the gears or putting the rear end in?
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Old 03-31-2014, 06:35 PM   #65
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Swapping the rear end! LCA bolts had rusted to the shell. Tried to beat them out but that didn't work. Had to saw them out by hand and now I'm waiting for new bushings an bolts to come in. It's been on jack stands or a week now.
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Old 03-31-2014, 06:37 PM   #66
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That sucks, at least it's just the bolts not a bad differential or something expensive.
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Old 03-31-2014, 06:39 PM   #67
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Very true! Just frustrating as hell haha I'm just ready to feel the t-lock and 4.10s!
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Old 03-31-2014, 06:46 PM   #68
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That sucks, at least it's just the bolts not a bad differential or something expensive.
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Old 03-31-2014, 06:47 PM   #69
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Idk why that posted twice. Haha and yea that will be sick! I would have gone 4.10 but I picked up an m112 so I am thinking the highest I will go is 3.55.
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Old 03-31-2014, 07:25 PM   #70
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Mine double posts all the time. And that's awesome!
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