Lincoln vs Cadillac Forums

(This is the forums archive - If you want to get back to the main site simply click the banner above and you will be taken to our homepage.)

Lincoln vs Cadillac Forums is the Ultimate Online Resource for Owners and Enthusiasts of American Luxury Cars. Feel free to browse through our archive - but make sure you make it back to our main site - Lincoln vs Cadillac Forums

Cadillac XLR : Cadillac CTS : Cadillac : 2005 Cadillac STS : Cadillac Forums : 2000 Lincoln LS : Lincoln Mark VIII : Lincoln Mark VII : Car Wax
Lincoln Town Car : Lincoln Air Suspension : Lincoln Continental : Lemon Law : Do It Yourself Car Repair : Lincoln vs Cadillac Forums : Mesothelioma

Back to the Archive Main Page

Pages: 1

Rear Gearing

(Click here to view the original thread with full colors/images)

Posted by: MrWilson

3.73 posi. first of all i think it exists, but im not sure, does it? secondly, if it does can it be swapped semi easily with the stock 3.07/8)

ps : im affraid of messing up expensive parts on the car, so i dont try to do things myself, i just find out what i want and how its done.

Posted by: Jibit

they existed in the Cobra mustangs with the IRS ('99 to 03 I believe would be a direct swap) They bolt right in. Or you can get the posi from a mustang and buy the gears and have somone rebuild the rearend for you.

Posted by: MonsterMark

Just buy a Ford factory pumpkin with posi and the 373's for about $650 and call it a day.

Posted by: MrWilson

well, actually i kinda want somthing better than the 3.73, but not as bad on gas and top speed as the 4.10, is there a happy medium? also is the 3.73 posi pumpkin a direct bolt on with IRS, because i had looked into this before at the dealer, and he said basicly the same thing, get a pump with the gears and get someone to install it, but then he said that he couldnt sell it to me because it wasnt a factory option for the car when it came out. any heads up on what to do with that?

Posted by: Jibit

a dealer won't do anything unless its a factory option, you'll have to find an independent shop

Posted by: ONEBADMK8

The 99 and 01 Cobra have 28 spline IRS while the 03 Cobra got treated to a 31-spline IRS to help deal with the power.

Posted by: 1wykdmk8

Give Max @ 5 Star Ford a call 1-800-866-1520 ext 236, his prices CAN NOT be beaten. You can either buy just the gears and have them installed, or you can buy a new pumpkin and new gears and have it all installed....but give Max a call, he will set ya straight!

Posted by: ONEBADMK8

Don't for get http://www.dennysdriveshaft.com/

Posted by: 1wykdmk8

Quote:

Originally Posted by ONEBADMK8

Don't for get http://www.dennysdriveshaft.com/

Ahhhhhh...I knew that there was sumfin I was fergittin.......but I have not needed one as of yet......lucky enuf to have the one piece, and have not changed gears yet either.......

Posted by: MonsterMark

I am not a big fan of the 4:10's for a couple of reasons. Hear me out. If you run on the highway alot, most of the time you will be running with the IMRC's open which is not a good thing. If you are into drag racing, I haven't really seen a big pickup in time slips in the quarter. The mph don't seem to be there. The car seems to run out of gear. Flame me, but IMHO!

I may be talking out of my ass at this point but this is one man's opinion. If I were going to add a power adder, I wouldn't go above a 373. If I ran mostly on the street NA, by all means run 410's or even 430's.

My decision would be based mostly on what type of driving I do. That is where you must start. I know lots of guys that have run 410's and then do alot of freeway driving and not only is it alot of wear and tear, I think it gets tiring. Like I said, on the street, absolutely go for the biggest gear you can get. These cars don't make any kind of real power until 3500 rpm+.

Off to see the Christmaas lights. Take care.

Posted by: MrWilson

i didnt forget about the driveshaft, but i wouldnt go with a double DS, a single metal matrix DS ballenced up to 10,000 RPM. also, i do do a LOT of highway driving, namley at the 85mph range, so i dont think that i would like seeing 4000 rpm for 3 hours

Posted by: EDSVIII

I have 4.30s and I drive 60 miles one way to work, its not that bad at all When I switched to the 4.30s I kinda expected it to be alot more noticeable than it is.

Posted by: MrWilson

and what is your rpm crusing at 85?

Posted by: ONEBADMK8

Your right around the corner from me.
I have 4.10's in The TerminVIIIor"
Stop by and Ill take ya for a ride so you can check them out.

Posted by: MrWilson

and where would that be? im from mount laurel

Posted by: ONEBADMK8

Im right in Gloucester City. I used to Live in Mt Laurel. Right in Michaelson's Gate off Hooten Road.

Posted by: MrWilson

Quote:

Originally Posted by ONEBADMK8

Im right in Gloucester City. I used to Live in Mt Laurel. Right in Michaelson's Gate off Hooten Road.

well how about that, that is close....hmmm i could think of an idea for a christmas presant

Posted by: EDSVIII

Mrwilson I am not sure on the rpm cuz my tach quit a while back , but I would guess around 3grand at 85mph.

Posted by: MrWilson

hmm...well thanks but i think ill stick with aspirations for the 3.73

Posted by: Ricksquickviii

Quote:

Originally Posted by MrWilson

hmm...well thanks but i think ill stick with aspirations for the 3.73

Hi,
i have 3.73 gears w/ trac lock love them they seem just right for me i bought my from max at 5 star ford

Posted by: Sifrino3

Quote:

Originally Posted by ONEBADMK8

Don't for get http://www.dennysdriveshaft.com/

Man, thats pretty!

Posted by: Dern Humpus

So is the driveshaft needed for 3.73's?

Posted by: MonsterMark

Sometimes. You can always install the gears and try them out. Not that big of a deal to drop the shaft later.

Posted by: ONEBADMK8

99% chance you will need it, guaranteed.