Got Gears!!
3rd Gear Member
Joined: May 2004
Posts: 614
From: Richmond, VA
RE: Got Gears!!
I agree with nitrous bob - standard at first, and then synthetic. I just changed mine after the installation of my gears and posi, and I put Royal Purple in there. Turns out that you have to put friction modifier in with RP (even though they claim it has limited slip additive in it) - I heard a nice metal-on-metal clanking coming from the rear end, so I drained out the RP and put Mobil One in there (w/the modifier). Everything is fine now 
Joined: May 2006
Posts: 18
From:
RE: Got Gears!!
There is a formula to find the correct speedo gear size that is very easy. My car for instance came with 273 gears and I installed 355
gears. First you need to divide the old gear size by the new gear size, 273/355 = .76 Take your old speedo gear out, lets say it is a 19
tooth, 19/ .76 =25 You would need a 25 tooth speedo gear. To check the ratio: 19/25= .76 Normally you can get a speedo gear that will get you a one to two percent accuarcy.
[IMG]local://upfiles/37810/E758B4B0CEB445DB97B6B37F9A19F3FB.jpg[/IMG]
gears. First you need to divide the old gear size by the new gear size, 273/355 = .76 Take your old speedo gear out, lets say it is a 19
tooth, 19/ .76 =25 You would need a 25 tooth speedo gear. To check the ratio: 19/25= .76 Normally you can get a speedo gear that will get you a one to two percent accuarcy.
[IMG]local://upfiles/37810/E758B4B0CEB445DB97B6B37F9A19F3FB.jpg[/IMG]
6th Gear Member
Joined: May 2004
Posts: 9,092
From: las vegas, nv
RE: Got Gears!!
ORIGINAL: nitrous_bob
as far as the speedo gear...you cannot correct a aod past 3.27's
you have a machined 8 tooth drive gear on your output shaft , a t5 has a plastic one that can be replaced w/ minor disassembly (i did my 6 tooth replacement w/ the rebuilt trans)
anyways...a 6 tooth drive and probably 20 tooth driven would work for you...but you have to replce the entire output shaft to do it.
so your only option is a 23tooth non ford part (the jeep part, it's the white one that everyone sells and calls steeda) it will get you probably within 15% error
as far as the speedo gear...you cannot correct a aod past 3.27's
you have a machined 8 tooth drive gear on your output shaft , a t5 has a plastic one that can be replaced w/ minor disassembly (i did my 6 tooth replacement w/ the rebuilt trans)
anyways...a 6 tooth drive and probably 20 tooth driven would work for you...but you have to replce the entire output shaft to do it.
so your only option is a 23tooth non ford part (the jeep part, it's the white one that everyone sells and calls steeda) it will get you probably within 15% error
5th Gear Member
Joined: Mar 2006
Posts: 2,228
From:
RE: Got Gears!!
i got the purple 3.73 21 tooth gear for mine cause with my 3.90s and my 245/60/15 tires that im gona be putting on the back its gonna act more like 3.73 gears than 4.10s and since they dont make a 3.90 gear i figured i would go with that 1. Seems to be pretty close but i havent put the 245s on there yet so its still a little bit off. I figure it should be near perfect when i get the larger tires.
3rd Gear Member
Joined: Apr 2006
Posts: 751
From: Maine
RE: Got Gears!!
ORIGINAL: Sleeper302
There is a formula to find the correct speedo gear size that is very easy. My car for instance came with 273 gears and I installed 355
gears. First you need to divide the old gear size by the new gear size, 273/355 = .76 Take your old speedo gear out, lets say it is a 19
tooth, 19/ .76 =25 You would need a 25 tooth speedo gear. To check the ratio: 19/25= .76 Normally you can get a speedo gear that will get you a one to two percent accuarcy.
[IMG]local://upfiles/37810/E758B4B0CEB445DB97B6B37F9A19F3FB.jpg[/IMG]
There is a formula to find the correct speedo gear size that is very easy. My car for instance came with 273 gears and I installed 355
gears. First you need to divide the old gear size by the new gear size, 273/355 = .76 Take your old speedo gear out, lets say it is a 19
tooth, 19/ .76 =25 You would need a 25 tooth speedo gear. To check the ratio: 19/25= .76 Normally you can get a speedo gear that will get you a one to two percent accuarcy.
[IMG]local://upfiles/37810/E758B4B0CEB445DB97B6B37F9A19F3FB.jpg[/IMG]
i wouldnt go by this, go by the chart that addermk2 posted in that link to the other topic that i provided...then you KNOW its right. i went by that and my speedo is 100% correct. if you want it to be correct, then go by that chart.
Thread
Thread Starter
Forum
Replies
Last Post
KingRando
2005-2014 Mustangs
5
Oct 2, 2015 08:06 AM
junior04
4.6L (1996-2004 Modular) Mustang
1
Sep 28, 2015 10:53 AM
