So I want to install a 4.10 gear in my 95 GT with auto, but not unless I can find a working speedo gear. I'm very anal about driveability and functionality in this car so the speedo has to work right. Steeda sells the white 23 tooth speedo gear, but I'm not sure how it works. They say it works with 3.55, 3.73, and 4.10 gears but how is that possible. I cant see how it can provide the correct speedo reading with 3 different rearend gears. Plus I hear these gears are only good for like 6 months before they breakdown. Anyone got the skinny with this thing since I know plenty of you are running 4.10s with an AOD or AODE. Thanks, Scot Rod
How does one speedo gear work with all gears??
- Thread starter SmockDoiley
- Start date
I know the speedo gears for the T5 say they're most accurate for the 3.55's, and decrease in accuracy up to 4.10's. I'd guess they can't accurately and economically make a gear that's 100% accurate for 3.73's or 4.10's, so they just sell the 3.55's. Maybe it's the same way with the AOD.
I've heard about a thing that allows you to run any rear end/tire combo and change for it, but it's like $200 if I remember right. I think JRichker or HISSIN50 told me about it a couple years ago.
I've heard about a thing that allows you to run any rear end/tire combo and change for it, but it's like $200 if I remember right. I think JRichker or HISSIN50 told me about it a couple years ago.
The 23 tooth gear will be close but the problem is the drive gear inside your tranny. The 90-95 t5's have an 8 tooth drive gear. To really get it right you will need a 6 tooth drive gear and a 20 tooth speedo gear. This is all assuming that you have stock height tires.
TRWXXA
Member
One speedo driven gear can't be good for all those different gears. What they probably mean is that it is good for those gears if you also have the appropriate speedo drive gear to go with the combination -- 6-tooth for 4.10s, 7-tooth for 3.73s, etc.
Even if you buy the "correct" gear, your speedo still might be off a little since it's rare that any gear will get it 100% accurate.
Even if you buy the "correct" gear, your speedo still might be off a little since it's rare that any gear will get it 100% accurate.
here's your answer...
The stock range of speedo gears work correctly with a limited range of tire sizes.
See http://www.corral.net/tech/gearcalc.html for more help
Check to see if there is a speedometer shop in your area. If there is, ask about the Stewart-Warner speedometer gearbox. I believe it is either a 777 Series Drive Joint Kits and Parts or 666 Series Drive Joint Kits and Parts. It is a small gear box that fits between the speedo pickup gear on the transmission and the speedometer. It has quick change gears that allow you to choose almost any tire size and rear end gear ratio you want. This will allow you to get the accuracy with within 1%-3%. The drawback is that it isn't cheap.
Please excuse the typo (their's, not mine) in the following picture - it should read Custom ratio adapters, not Custom radio adapters.
See http://www.gaugeguys.com/ratioadapt.htm for more info.
The stock range of speedo gears work correctly with a limited range of tire sizes.
See http://www.corral.net/tech/gearcalc.html for more help
Check to see if there is a speedometer shop in your area. If there is, ask about the Stewart-Warner speedometer gearbox. I believe it is either a 777 Series Drive Joint Kits and Parts or 666 Series Drive Joint Kits and Parts. It is a small gear box that fits between the speedo pickup gear on the transmission and the speedometer. It has quick change gears that allow you to choose almost any tire size and rear end gear ratio you want. This will allow you to get the accuracy with within 1%-3%. The drawback is that it isn't cheap.
Please excuse the typo (their's, not mine) in the following picture - it should read Custom ratio adapters, not Custom radio adapters.
See http://www.gaugeguys.com/ratioadapt.htm for more info.
I know the principal of how its working. They assume you'll do it right with a different drive gear or play with tire sizes, or just accept that its closer than the speedo gear you were using, but I dont think its right. I know that it cant physically work so they need to include instructions or tell you what else you need to make it work correctly. I'm not going to gear my car up if I have to put up with an incorrect speedo which leads to false mileage and tickets. And I'm not playing with tire size just so I have a good speedo. I dont have too many options on tire anyways since I need a 315 on a 10.5 inch rim. And incase you didnt see, I have an AODE, not a stick. Thanks for the info though. I'll check out that "Radio" adapter, lol.
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