Hi guys, i have qustion that might been asked couple of times, but i want to be straight forward with this. Im planning to get a CAI+Tuner this week from Demolet and order Bamachips tune. So this is my first mod. I've seen the gears are very famous mods for our S197 stangs and amazingly they are very well priced, i even found some less than 100 bucks on ebay. Now how hard is it to be installed, i mean do i have to pay big bucks for the labor charge or is it fairly easy process? Is there anything else that can be done while the gears are going to be installed that will save me money on the long run. Also is 3.73 would do the job for my stock car or do i need 4.41 for better acceleration. I have a auto car and dont want to change anything about my shifter. BTW is there anything more important than Gears beside the intake and tune, what about the underdrive pulleys? what are their job, some people say you can get 15 more hp with those, are they easy to install too? Thanks a lot all of you
what kind of motor? if its the V6 i dunno? but for the 5.0 or 4.6 ide stick with 3.73s because the autos came with 2.73s and thats alot , PERSONALLY ide go with 3.90s thats what im having installed in mine other than that, a CAI and tune are great first mods, even though you dont really need a FULL CAI i would just get a K&N Replacement cone and remove the rubber seal from the fender wall so you can suck in cool air from the fender well,
and yes Gears are a very tough job you want someone that has done them before and you want them to ABSOLUTELY know what they're doing because its a difficult process and the lowest ive heard gear install is about,
$230.00 or so and thats without the install kit
hope that helps!
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*1994 Mustang GT Laser Red w/ White Stripes -
GT40P heads, Cobra Upper & Lower Intake w/ 1/2 Spacer, Ford Racing Ceramic Coated Shorties, 2.25" Exhaust No cats, Flowmaster 40s, 3.5" Stainless Steel Tips, Ford Racing 3.73's, K&N CAI, EdelBrock Chrome Valve Covers, 17" Silver Cobra R rims, Brembo Rotors, 94' Cobra Calipers!
*1982 GMC High Sierra6.2l Diesel 4X4-
Custom CAI, Custom 4" Stainless Steel Stacks, 4:56 Posi, Dana 44 F, Dana 70 R, 15" Bullethole Rims, 33" BFG's, A.K.A BigRED
Since your post is in the 2005+ v6 mustang section i'll assume you have a 2005 or newer mustang with a 4.0L v6 motor. Since I have the same mods on nearly the same vehicle I can give you a pretty accurate description of what to expect. The only difference is that my car is a 5-speed.
Your car has a 7.5", 28 spline rear end with an open differential (no posi-traction) and 3.31:1 gear ratio. 3.90's are generally not available for a 7.5" 28 spline rear end so the most popular ratios are 3.73 and 4.10. 3.73's are a good choice if your car is a daily driver or you like to take it on road trips. They will give you plenty of grunt through first and second and really make 4th gear worth using around town. 4.10's are better if you're planning to build a track oriented car that you're not going to drive daily.
Since you have an open differential, your car will transfer all the power to one wheel (usually the passenger side rear) under heavy acceleration. This is bad because it causes you to have less traction (imagine 200rwhp on 1 rear wheel as opposed to 100 rwhp on each of the rear wheels). Installing a posi-traction differential such as the Ford traction-lock will help distribute your power evenly between the two rear wheels resulting in tons more traction and nice healthy looking 2 streak burn-outs. Before I installed my gears and t-lock I would spin tire through first and second and into third gear. Now first will hook up on a 2000rpm launch and second will chirp and hook up right away as well.
The guy who posted above me said not to get a full cai, but if you're going to get a custom tune for a specific cai then get the entire cai kit. You don't know what kind of differences it may make by having just the filter or not and its better to be safe than sorry. The Demolet is a great looking piece and the craftsmanship is super-high.
If you're looking for more cheap power, then look into an aftermarket muffler or dual exhaust setup. Just adding an aftermarket muffler will gain you around 10rwhp on the 2005+ v6.
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Black 2005 Mustang v6, 5 speed, IUP, EUP and Leather.
Razzi 1/4 window scoops, Mustang GT Sway Bars, Flowmaster American Thunder Single Exhaust, Clear Front Turn Signal Lenses, Demolet CAI, X-cal2 91 tune, Hurst Comp/Plus Shifter, FRPP T-Lock, Ford 3.73 gears
underdrive pulleys really don't do much for the 4.0. In fact, most of the bolt-on parts dont, unless you start getting serious and go with a supercharger or a turbo-charger. IF you're going to do gears, save the money and get a takeoff 8.8, which will come with gears, and posi-trak
Thanks "Black05Pony" for the nice explanation. To make things clear, yes i do have the 4.0 V6 2007 Mustang. I forgot to mention that i already got rid of that restrictive muffler with a GT take off one, it sounds real nice, i love it. "SDS187" made a great point, i didnt know 8.8 comes with Gears and T-lock, its good to have you guys around
Thanks everyone
hmm well mine was accurate if you have a 94-03 i think it is, lol with the 8.8 rear
sorry!
No big deal. The new GT's have an 8.8" rear too so its easy to get confused.
Venom if you have a shop you trust to do your gears then you're just as well off getting a gears/tlock job as you would be getting an 8.8". Unless you plan on adding forced induction (supercharger/turbo) or making a lot of power in the future then the 7.5" should suit your needs. It should be about $200 cheaper to get a gear/tlock job than a take-off but you risk getting a bad gear job.
Unless you've got a shop that you trust like I did, then get the 8.8 and you wont be disappointed.
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Black 2005 Mustang v6, 5 speed, IUP, EUP and Leather.
Razzi 1/4 window scoops, Mustang GT Sway Bars, Flowmaster American Thunder Single Exhaust, Clear Front Turn Signal Lenses, Demolet CAI, X-cal2 91 tune, Hurst Comp/Plus Shifter, FRPP T-Lock, Ford 3.73 gears
No big deal. The new GT's have an 8.8" rear too so its easy to get confused.
Venom if you have a shop you trust to do your gears then you're just as well off getting a gears/tlock job as you would be getting an 8.8". Unless you plan on adding forced induction (supercharger/turbo) or making a lot of power in the future then the 7.5" should suit your needs. It should be about $200 cheaper to get a gear/tlock job than a take-off but you risk getting a bad gear job.
Unless you've got a shop that you trust like I did, then get the 8.8 and you wont be disappointed.
Unfortunately i dont know any shop yet, however we have lots of Mustang owners here in my town and i can ask them the best shop that they go to. I did a math and getting t-loc and gears would be cheaper than buying the whole rear end I dont want any Forced induction as it will be too much for me, its just a DD However i love the sound of supercharger when a Roush or Shelby Mustang passes me
How a bout if i dont find a good shop, is it ok to just install the T-lock and leave the gears to 3.31??? I think Bamas tune would be a night and day different in auto tranny cars because he uses different shift curves and the car would shift firmer, i got this info from a local guy in my area who has Doug's 91 race tune on his GT, i met him at the track and heard about Doug's magic Race tune on the forums as well.
Just had the 7.5" T-lock installed on my 08 V6 5 speed. Picked it up this afternoon. Noticed the difference in traction immediately, with out even pushing it. First impression is that it is a very satisfactory mod.
Unfortunately i dont know any shop yet, however we have lots of Mustang owners here in my town and i can ask them the best shop that they go to. I did a math and getting t-loc and gears would be cheaper than buying the whole rear end I dont want any Forced induction as it will be too much for me, its just a DD However i love the sound of supercharger when a Roush or Shelby Mustang passes me
How a bout if i dont find a good shop, is it ok to just install the T-lock and leave the gears to 3.31??? I think Bamas tune would be a night and day different in auto tranny cars because he uses different shift curves and the car would shift firmer, i got this info from a local guy in my area who has Doug's 91 race tune on his GT, i met him at the track and heard about Doug's magic Race tune on the forums as well.
I live near Seattle, and Randy's Ring and Pinion is here in Everett WA . It would be a 2-3 hr trip for you, but they litteraly are WORLD renound rear end folks. I have had several cars done by them and have never had ANY problems, They could probably do it for you in a day, drive down in the morning, putz around Seattle for the day, and pick it up and drive it home in the afternoon.
I live near Seattle, and Randy's Ring and Pinion is here in Everett WA . It would be a 2-3 hr trip for you, but they litteraly are WORLD renound rear end folks. I have had several cars done by them and have never had ANY problems, They could probably do it for you in a day, drive down in the morning, putz around Seattle for the day, and pick it up and drive it home in the afternoon.
Thanks for the info, yeah actually i've been to Seattle couple times before. My only issue is the border was really suspicious on me the first time i came with my Mustang, because it has a Roush body upgrade they thought its a real 60-70 grans car and asked me so much questions, even the guy in the booth tried to trick me and asked that theres a V8 under the hood, i said no its a stock V6 because i knew they'll check the car, but when they saw i was right they let me go but this never happened with my crappy 77 Plymouth Fury
So sure i'll see if i can buy the parts and bring it down there
Question on Gears and Pulleys! 
I dont want any Forced induction as it will be too much for me, its just a DD 
However i love the sound of supercharger when a Roush or Shelby Mustang passes me 
