[99spaded]

Well i already have 3.73 in my car (bought it that way) but after reading alot of posts about the 4.10 difference i am thinking of changing them. I have an auto trans and my question is: Are the 3.73 better for an auto or the 4.10???... I'm not worried about gas mileage, the car is not driven everyday, but just looking for a little more get up!! Thanks!!

[mustangmanic]

Its not better or worse. Just make sure you install them right and there wont be any problems

[HMUSN]

4:10

you won't see as much as a difference because you already have 3:73's but it will def. still be noticed

[99spaded]

yeah i didn't think there would be alot of difference, but the rear end is starting to whine a lil bit so i need to open it up and check things out anyways, So i guess i will find out!!..

[mustangmanic]

just make sure you get quality gears... if they're lower than $120 then they're shit. You get what you pay for... and fyi i know you dont care but b/t 3.73 and 4.10, there is no difference in MPG

[99spaded]

Yeah for sure, i was thinking of getting the ford racing 4.10 gear set, should i get the master install kit too??... The one that comes with bearings and everything??... Just to be safe??!!!

[orangeRcode]

Depends on how old the bearings are that are already in there and how careful you are when pressing them off and back on. Bearings are cheap relative to the install price especially when purchased as a kit. I would go ahead and get them and have them installed.

[99spaded]

Ok, well i am probably gonna take the diff cover off this weekend and change the fluid, and inspect everything, and that will most likely be when i make the decision!! Hey one more question, what gear oil(grade-weight) should i use with the existing 3.73??.... Definitely a synthetic...royal purple, mobil one??... and how many bottles??.. Thanks!!

[HMUSN]

RP.. 2 3/4 bottles.

[99spaded]

Cool, thanks, what grade??..

[HMUSN]

75w90

[99spaded]

ok thanks

[jagstang96]

Hey guys need some info, i had some 4.10 gears installed and made a bad choise by choosing motive gears, not only that but the shop that installed them really sucked. Well i got my money for the install back but now im stuck with a bad install, when i speed up and pick up speed i hear some heavy winning , when im slowing down it does not wine at all is there something that i can check to help this issue temporarily.

[HMUSN]

not really.

they should be reinstalled properly.

[gills99stang]

4:10's for an auto FTW...

+1 on getting Royal Purple!

[Smoothgrandmama]

Originally Posted by 99spaded Well i already have 3.73 in my car (bought it that way) but after reading alot of posts about the 4.10 difference i am thinking of changing them. I have an auto trans and my question is: Are the 3.73 better for an auto or the 4.10???... I'm not worried about gas mileage, the car is not driven everyday, but just looking for a little more get up!! Thanks!!

Have You had Your car tuned?
If You've already got 373's I'd go for a tune espesially with an auto a tune can shave 1/4 sec or more off a 1/4 mile time
Which is than what You'll get from a gear chage

[MustangMatt96GT]

ford racing parts gears are the best! I say stick with the 3.73s for now and spend your money else where! You arnt going to be impressed with the 3.73 to 4.10 swap!

[99spaded]

yeah well i wasn't to sure about how much difference there would be, my thing is that right now the rear end is whining a lil and i just figured is somethings not right in there and the 3.73's are worn or damaged then i would put in 4.10's!!

And no i do not have any sort of tune on the car, handheld or dyno..

[Ryan Paymaster]

If you're bored as hell and got a couple bucks to spend get the 410s from Ford Racing. Late Model Restoration has them for sure. If they are like $220 + it's the FRPP ones. Since you recieved your install money back you might want to spend a bit more and go with the gear that will make you happy in the end.

Right now I have the 410 I got at a really good price waiting to install. I'm starting to think I should have went with a 430. However, I think of it this way, a 430 wouldnt be of any use to me with future plans, so I'm just planning for the future. You can rationalize like I am too and say "I'm just going to get a supercharger later so hell, 3.73 is fine!" :lala

I also can use a speedo gear, you'll have to buy a much more expensive speed calibrator. I'd look into spending those bucks on a handheld tuner that can calibrate for you. Kill two birds with one stone. Don't pay for an install on a gear that won't make you happy though. You'll kick yourself later.