4.1 gears

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Nov 14, 2005 | 10:22 PM

chrisc

Thread Starter

5th Gear Member

Joined: Oct 2005

Posts: 3,696

From: Seattle, WA

4.1 gears

hi, i was looking to upgrade my transmision to having 4.1 gears
i hear that i will need more than just the gears to set it up, and i was wondering what else was necissary

thanks

Nov 14, 2005 | 10:28 PM

rygenstormlocke

6th Gear Member

Joined: Jul 2005

Posts: 5,172

RE: 4.1 gears

Quote:

ORIGINAL: chrisc

hi, i was looking to upgrade my transmision to having 4.1 gears
i hear that i will need more than just the gears to set it up, and i was wondering what else was necissary

thanks

Mine go in on Thursday morning. If you change out the gears, you may as well change out the diff and if you got gears, you will need a bearing kit. I'm doing all three thursday, so I can post again and let you know how it goes.

Nov 14, 2005 | 10:34 PM

chrisc

Thread Starter

5th Gear Member

Joined: Oct 2005

Posts: 3,696

From: Seattle, WA

RE: 4.1 gears

did you buy your stuff from online?
if you did could i please get the links? thanks a lot
(sorry i am really new to this)

Nov 14, 2005 | 11:04 PM

mtal1259

1st Gear Member

Joined: Sep 2005

Posts: 113

From:

RE: 4.1 gears

I was thinking about getting the 4.10 gears also, because even with the intake and exhaust, plus tune, I still would like the car to be quicker off the line. But wont this KILL the gas mileage? When cruising on the highway at 75mph, I am at less than 2500RPM. With 4.10 gears, wont that require 3000+RPM? That is at least a few MPG difference, isn't it? I am curious about this. Also, how much does it lower the top speed (not like I go over 125MPH that often).

Nov 14, 2005 | 11:09 PM

rygenstormlocke

6th Gear Member

Joined: Jul 2005

Posts: 5,172

RE: 4.1 gears

Quote:

ORIGINAL: mtal1259

I was thinking about getting the 4.10 gears also, because even with the intake and exhaust, plus tune, I still would like the car to be quicker off the line. But wont this KILL the gas mileage? When cruising on the highway at 75mph, I am at less than 2500RPM. With 4.10 gears, wont that require 3000+RPM? That is at least a few MPG difference, isn't it? I am curious about this. Also, how much does it lower the top speed (not like I go over 125MPH that often).

MSP at another forum helped me with the calculations. It's roughly 250 more RPM between 70-80MPH. Also, another member told me he gets only 2MPG less than me with his 4.10s. So I do not think it is a major loss, considering you get a MPG gain with CAI and exhaust, it should help cancel things out a bit.

I got my 4.10s from mustangtuning.com and my TLOK from ebay. My parts go in on thursday so I will have more to tell then.

Nov 14, 2005 | 11:14 PM

mtal1259

1st Gear Member

Joined: Sep 2005

Posts: 113

From:

RE: 4.1 gears

cool, thats good to know. Be sure to post once the work is done. The rear-end is the next thing I am doing, but would like to see what a few others say about it before I jump in.

Nov 14, 2005 | 11:49 PM

dinoe254

Joined: Oct 2005

Posts: 49

From:

RE: 4.1 gears

rygen how much did all of your gear stuff cost you? do you know how much labor will be?

Nov 14, 2005 | 11:51 PM

rygenstormlocke

6th Gear Member

Joined: Jul 2005

Posts: 5,172

RE: 4.1 gears

Quote:

ORIGINAL: dinoe254

rygen how much did all of your gear stuff cost you? do you know how much labor will be?

Gears were 144, bearings like 75 and TLOK shipped was 180 if I remember correctly. Install cost will vary, I have been quoted 255 to 550. Most people on the forums say to expect 300. I got a race shop to do it for 255, but will probably be closer to 300 with the fluid.

Nov 14, 2005 | 11:56 PM

chrisc

Thread Starter

5th Gear Member

Joined: Oct 2005

Posts: 3,696

From: Seattle, WA

RE: 4.1 gears

sorry for so many questions, what kind of tlok did you use? how do i know which type is right for our car?

thanks

Nov 15, 2005 | 12:05 AM

#10

rygenstormlocke

6th Gear Member

Joined: Jul 2005

Posts: 5,172

RE: 4.1 gears

Quote:

ORIGINAL: chrisc

sorry for so many questions, what kind of tlok did you use? how do i know which type is right for our car?

thanks

No problem. Ford Racing TLOK for the 7.5 rear end. Your choices are Ford Racing and Detroit TruTrac or Detroit Locker. Before you buy them I would check around local places to install them.