4.30:1 gear/AOD/ speedo gear?

gearheadboy · Mar 2, 2004

Speedo gear calculator! Awesome!

I found this speedo gear calculator, it is awesome. www.finer.com/Internet/pages/speedo.htm I was wondering what do I do with a 4.30:1 rear ratio, and an AOD.
I went to Steeda's website, they make a "white gear" for a 4.11:1 and I thought that would be close enough, but further inspection looks like they use the same gear for 3.55/3.73/4.11. What the heck? And what can I do?

Mustang John · Mar 3, 2004

I believe 23 tooth is as close as you'll get and that is about right on for an AOD and 3.73s, 4.10s will be off a bit, as will 4.30s.

If you have a 7 tooth drive gear on your output shaft, it will be closer than an 8 tooth unit would be.

The 23 tooth units wear out sorta quick it seems as well...

willys1 · Mar 3, 2004

Yeah,23 tooth is the bast your gonna do,I heard they wear out fast but ( knock on wood) mines over a month old and hasent skipped a beat!!

VooDooChild · Mar 11, 2004

Where do you get the 23 tooth gears at?

hllon4whls · Mar 11, 2004

gearheadboy said:
I found this speedo gear calculator, it is awesome. www.finer.com/Internet/pages/speedo.htm I was wondering what do I do with a 4.30:1 rear ratio, and an AOD.
I went to Steeda's website, they make a "white gear" for a 4.11:1 and I thought that would be close enough, but further inspection looks like they use the same gear for 3.55/3.73/4.11. What the heck? And what can I do?

I have heard about problems with the 4.10 and up gears stripping the teeth. There is an external adaptor that you can get to accomidate any ratio. Couple of company makes them, dont know the name, but should be easy enough to find.

Mustang John · Mar 11, 2004

It used to that there were Speedometer shops that would make you a mechanical transducer / gear ratio adapter boxes, but those shops are nonexistant anymore that I know of.

The only adapters I've personally seen in the mags are for later model electronic speedometers (VSS based) and I ALWAYS try to look, hehe...

I've had good luck with my 23 tooth gear as far as not wearing out, but I've seen alot at work that apple cored pretty quickly.

If anyone knows of an adapter gearbox that works with mechanical speedometers from AODs and AODE.4R70Ws, I'd be VERY thankful to know of the maker.

willys1 · Mar 11, 2004

VooDooChild said:
Where do you get the 23 tooth gears at?

I called up summit,they got it from TCI,19 bucks,,LOL,,hows your rpm's on the highway?

1hot5.0 · Mar 11, 2004

Mustang John said:
It used to that there were Speedometer shops that would make you a mechanical transducer / gear ratio adapter boxes, but those shops are nonexistant anymore that I know of.

The only adapters I've personally seen in the mags are for later model electronic speedometers (VSS based) and I ALWAYS try to look, hehe...

I've had good luck with my 23 tooth gear as far as not wearing out, but I've seen alot at work that apple cored pretty quickly.

If anyone knows of an adapter gearbox that works with mechanical speedometers from AODs and AODE.4R70Ws, I'd be VERY thankful to know of the maker.

Not true, those boxes still exist. I just had one made for me when I got my 4.10's a little over a month ago. It wasd $170 installed and $30 if I change tire or gear ratios again.

willys1 · Mar 11, 2004

1hot5.0 said:
Not true, those boxes still exist. I just had one made for me when I got my 4.10's a little over a month ago. It wasd $170 installed and $30 if I change tire or gear ratios again.

1Hot5.0,,where did you buy that? And whats the name of it? Does it work well? Im getting 410's pretty soon ( finally ) and I think that box is my ticket

4.30:1 gear/AOD/ speedo gear?

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