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View Full Version : anyone changed the gears in the rear end?


04SVT
01-05-2005, 10:05 AM
I had a 4:10 gears installed in my TransAM WS6 and it made an incredible low end difference. Has anyone changed the gears in their Cobra. I've spoken to several people about this and have got different opinions from every one.

blk04cobra1
01-05-2005, 11:46 AM
some have said not too b/c of the torque on the IRS, but my guess is if you support the IRS enough, why not? I know the 4.10's make a huge low-end difference on the GT's...

crunchit
01-05-2005, 05:41 PM
The tech at ford who does my mods for me advised me not to move up to 411's. Said the IRS would wouldn't fair well for all the street driving i do. Reccomended 373's. Said I'd still get good bottom end. I hope this helps.:)

smashedheadcat
01-05-2005, 08:55 PM
A set of 3.90's are about as agressive as you'd want to go with the '03s. Most keep the 3.55's though.

jack
01-05-2005, 10:15 PM
I have rode in a 4.10 geared car. The owner and i both thought it was to much gear for the car. He is changing to 3.73's soon. The car felt like it lost some power by not letting the supercharger work because of the quicker rise in rpm's.

redsnake99
01-05-2005, 11:17 PM
I changed the stock 3.27 out for 3.55 in my 99 Supercharged Cobra. This was done about the same time I put the 6-speed tranny in. I have the same drivetrain as the 03-04's and it's a great combination for me. I spend only a couple of days a year at the drag strip, so higher gear ratio than 3.55 is ridiculous for me. I drive the car every day, road race it much more than drags.

I did notice though at Gingerman, I always seemed to be unable to use the top rpm's to my advantage, with most of the long runs needing a gear change near the end of the straght. I guess this is why the pro racers have several gear ratios they can choose from to best match the track they are running on.

:thumbsup:

flynfink
01-06-2005, 12:52 PM
4.30's in my NA 99'. If I have to do it again, I'd probably go with 4:10's. Big difference from the stock gearing.

nckissfan
01-20-2005, 04:27 PM
how much should a set of gears go for? I saw a set of Ford Racing 4.10's on Summit Racing for $199. This a good price? Would the 4.10's benefit my 97? I do daily drive the car, so would that not be a good idea? Any other suggestions? Thanks guys!

flynfink
01-20-2005, 04:31 PM
how much should a set of gears go for? I saw a set of Ford Racing 4.10's on Summit Racing for $199. This a good price? Would the 4.10's benefit my 97? I do daily drive the car, so would that not be a good idea? Any other suggestions? Thanks guys!

go for it Mikey, you'll love the difference. $199 is about right. Install on your solid axle is less expensive than on my 99 IRS. Maybe about $200??

nckissfan
01-20-2005, 04:35 PM
go for it Mikey, you'll love the difference. $199 is about right. Install on your solid axle is less expensive than on my 99 IRS. Maybe about $200??
I am working on the install price right now, I found a set of Richmond's on Summit for $185. I am ready for a little change. Zooma, zoom, zoom!!

mus302
01-26-2005, 06:43 AM
I am working on the install price right now, I found a set of Richmond's on Summit for $185. I am ready for a little change. Zooma, zoom, zoom!!
Check out Performance Parts, Inc in the vendors section. They have FRPP 8.8 gear sets on their website for $169.99. And I think we get a discount off of that price as well.

cobrabitn
01-26-2005, 07:42 AM
I just ordered a set of gears for my 94 Cobra... get them from Gene Evans Ford or Late Model Restoration for $139.00 for FRPP. Plus you get a discount from Late Model as a club member.

Gene Evans - www.gefracing.com
Late Model Restoration - www.50resto.com

Hope that helps! :thumbsup:

RF Cobra
01-26-2005, 09:28 PM
I am working on the install price right now, I found a set of Richmond's on Summit for $185. I am ready for a little change. Zooma, zoom, zoom!!
You trying to make sure that you get pulled over for doing more than 2 mph over the limit next time? :rotf: ;) :)

I can't remember if my father-in-law put 3.73 or 4.10s in his 97 but it made big difference on the bottom end.

lorahcobra
01-30-2005, 12:02 PM
We are having 3.73's installed on our '03 as we speak :bounce: :bounce: . A whole slew of under-the-car stuff is going with them so it will be a couple of weeks before we can give you a "what we think" report...but will try to remember to do that. ;) As far as price, I wouldn't pay more than $140 or so, we bought ours at UPR's set-up at FFW for $130 cash (no tax, no shipping) :D

jack
01-30-2005, 04:05 PM
lorahcobra, if you dont mind me asking who are you having install the gears? Also how much are they charging to install the gears?

lorahcobra
01-31-2005, 07:07 PM
Blue Oval Classics in Kingsport. Like I said, a whole bunch of stuff is going under the car, so I'm not sure what he's charging just for the gear change itself. I will be talking to him to get a progress report tomorrow afternoon and I'll ask. If you need specifics like address and phone let me know but I'm sure you can just go to their web site and get most info you would need. If you are just looking for a gear change and no other suspension/chassis mods, I would recommend Robert Hindman off Tazewell Pike at 688-7890. He just won NMRA mod motor class (again) last year and is very reasonable. Several SCMC'ers in this area are using both...Robert for the motor, Beau for the suspension. :thumbsup: Steve