about to buy gears, have questions

fasterv6 · August 30th, 2009, 09:19 PM

hey guys
im about to go with this setup for my gears and have some questions, im just going to get a traction lok 28 spline 7.5 inch setup and 3.73 motive gears for the 7.5, both from american muscle. is this all i need or do i need to buy the bearing kit as well?
the car has 39k miles on it

sudbury33 · August 30th, 2009, 09:22 PM

Bearing kit is for 60K+ I believe

Make sure you get it tuned.

Ninjawafers! · August 30th, 2009, 09:53 PM

you will need the speedo calibrated for the 3.73 gears, and get the bearing/install kit. anytime you mess with the rear end you need to get one of those

Safi · August 30th, 2009, 10:41 PM

+1 to coastie

Seabee · August 30th, 2009, 10:46 PM

You can get the install kit, but sometimes the gear shop will have it all. I had the master bearing and still needed some other stuff.

RFM 40th V6 · August 31st, 2009, 01:04 AM

The bearing kit is for over 30k miles. Don't forget a speed cal or tuner to reset your gear ratio. The tuner would be the better choice.

Also make sure that you either buy Ford gear oil and the friction modifier or the royal purple from AM. You don't need the friction modifier if you go with royal purple.

fasterv6 · August 31st, 2009, 07:03 PM

ok so i do need the bearing kit? and how much will it really affect my speedo cuz it might be a while before i save up the money for the flash tuner...

RFM 40th V6 · September 1st, 2009, 06:49 PM

I'm not sure what the change in ratio will do to your speedometer. I believe it will make your speedometer read slower than you are moving.

fasterv6 · September 1st, 2009, 06:59 PM

ok as long as its only a few mph's off then it should be fine for the month or so until i get the tuner

Seabee · September 1st, 2009, 07:10 PM

Mine was only off by a couple mph, and when i got to about 60 or so it was saying i was doing like 68 ish. If youve driven enough, youll know what a certain mph feels like without lookin at the speedo.

Safi · September 1st, 2009, 07:44 PM

Originally Posted by NavySeabee87

Mine was only off by a couple mph, and when i got to about 60 or so it was saying i was doing like 68 ish. If youve driven enough, youll know what a certain mph feels like without lookin at the speedo.

+1

Also...Your milage will go faster with steeper gears and no tune. So basically every mile you go you'll gain like 1.4 (guesstimated number) miles on the odometer

Cricket · September 1st, 2009, 09:29 PM

If your having the rear worked on get a bearing kit anyways. I wouldn't want to re-use parts just because someone says it's ok for this period of time, especially in the differential.

Cricket · September 1st, 2009, 09:30 PM

Originally Posted by RFM 40th V6

I'm not sure what the change in ratio will do to your speedometer. I believe it will make your speedometer read slower than you are moving.

Nope. Says your going faster. When I had 4.10s installed in my GT(still miss that car sometimes) at about 60mph said I was doing 90mph.

fasterv6 · September 1st, 2009, 09:39 PM

thanks guys

Seabee · September 1st, 2009, 09:50 PM

Originally Posted by Cricket

Nope. Says your going faster. When I had 4.10s installed in my GT(still miss that car sometimes) at about 60mph said I was doing 90mph.

Really? mine wasnt off that bad, maybe 10mph but not 30.

mooses · September 1st, 2009, 11:44 PM

You can calculate what speed it'll show for different mph. Currently, you have 3.27 gears, and you want 3.73 gears. If you want to know how far off the speedo will be at 60 mph, multiply the speed by (3.73/3.27). 60 * (3.73/3.27) = 68.4 mph. So your speedo will be off by 8.4 mph at 60. At 70 mph, it'll be off by 9.8 mph. I think you see the trend...

August 30th, 2009, 09:19 PM	#1
fasterv6 Regular 2004 3.9L mustang v6 Join Date: Dec 2008 Location: houston Posts: 69 iTrader: 0 reviews	about to buy gears, have questions hey guys im about to go with this setup for my gears and have some questions, im just going to get a traction lok 28 spline 7.5 inch setup and 3.73 motive gears for the 7.5, both from american muscle. is this all i need or do i need to buy the bearing kit as well? the car has 39k miles on it __________________ "silly ricer, useless wings are for penguins" 2004 mustang 3.9L steeda short throw, h&r lowering springs, shorty antenna, tinted windows, smoked headlights/taillights, new shift knob, homemade grille delete GT4 replica rims next: 3.73s and LSD

August 30th, 2009, 09:53 PM	#3
Ninjawafers! muneris pro ego 97 5.0 Exploder AWD snow has nuthin on me Join Date: Aug 2006 Location: Kodiak, AK Posts: 7,379 iTrader: 1 reviews	you will need the speedo calibrated for the 3.73 gears, and get the bearing/install kit. anytime you mess with the rear end you need to get one of those __________________ Buy my M90 Kit and my Gears and T-Loc! MM ZDC - Alaska Base Commander MM+ Cleavage Club #24 MM Cares Crew / Military Crew M2C2 President / USCG - OS2

August 30th, 2009, 10:46 PM	#5
Seabee Whatever it originally would be 05 Saleen #824 Fast as fuck Join Date: Mar 2007 Location: San Diego Ca/Beach Park IL Posts: 7,477 iTrader: 4 reviews	You can get the install kit, but sometimes the gear shop will have it all. I had the master bearing and still needed some other stuff. __________________ MILITARY CREW ANTI ILLEGALS CREW FOUNDER

August 31st, 2009, 07:03 PM	#7
fasterv6 Regular 2004 3.9L mustang v6 Join Date: Dec 2008 Location: houston Posts: 69 iTrader: 0 reviews	ok so i do need the bearing kit? and how much will it really affect my speedo cuz it might be a while before i save up the money for the flash tuner... __________________ "silly ricer, useless wings are for penguins" 2004 mustang 3.9L steeda short throw, h&r lowering springs, shorty antenna, tinted windows, smoked headlights/taillights, new shift knob, homemade grille delete GT4 replica rims next: 3.73s and LSD

September 1st, 2009, 06:59 PM	#9
fasterv6 Regular 2004 3.9L mustang v6 Join Date: Dec 2008 Location: houston Posts: 69 iTrader: 0 reviews	ok as long as its only a few mph's off then it should be fine for the month or so until i get the tuner __________________ "silly ricer, useless wings are for penguins" 2004 mustang 3.9L steeda short throw, h&r lowering springs, shorty antenna, tinted windows, smoked headlights/taillights, new shift knob, homemade grille delete GT4 replica rims next: 3.73s and LSD

August 30th, 2009, 09:22 PM	#2
sudbury33 Enthusiast 2000 V6 Join Date: May 2009 Posts: 557 iTrader: 0 reviews	Bearing kit is for 60K+ I believe Make sure you get it tuned.

September 1st, 2009, 07:10 PM	#10
Seabee Whatever it originally would be 05 Saleen #824 Fast as fuck Join Date: Mar 2007 Location: San Diego Ca/Beach Park IL Posts: 7,477 iTrader: 4 reviews	Mine was only off by a couple mph, and when i got to about 60 or so it was saying i was doing like 68 ish. If youve driven enough, youll know what a certain mph feels like without lookin at the speedo. __________________ MILITARY CREW ANTI ILLEGALS CREW FOUNDER

September 1st, 2009, 09:39 PM	#14
fasterv6 Regular 2004 3.9L mustang v6 Join Date: Dec 2008 Location: houston Posts: 69 iTrader: 0 reviews	thanks guys __________________ "silly ricer, useless wings are for penguins" 2004 mustang 3.9L steeda short throw, h&r lowering springs, shorty antenna, tinted windows, smoked headlights/taillights, new shift knob, homemade grille delete GT4 replica rims next: 3.73s and LSD

September 1st, 2009, 11:44 PM	#16
mooses Regular Join Date: May 2008 Posts: 391 iTrader: 0 reviews	You can calculate what speed it'll show for different mph. Currently, you have 3.27 gears, and you want 3.73 gears. If you want to know how far off the speedo will be at 60 mph, multiply the speed by (3.73/3.27). 60 * (3.73/3.27) = 68.4 mph. So your speedo will be off by 8.4 mph at 60. At 70 mph, it'll be off by 9.8 mph. I think you see the trend...

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