TCCoA Forums banner

1 - 19 of 19 Posts

·
Registered
Joined
·
2,806 Posts
Discussion Starter #1
Got 3.55's a few weekends ago and have been trying to figure out the correct speedo gear. The sccoa calculator says tan, the one already in there from the 3.27's, but after searching here seem JL says orange. I am leaning towards orange because the calculator doesn't seem to be accurate when stock numbers are put in. It says a blue gear but mine came with a green and says a green gear shoulda been used with the 3.27's. The 3.27's and speedo gear came from a 96 sport so I was running the correct tire size and everything for that set up.

Thanks,
Bryan Miller
 

·
Registered
Joined
·
2,806 Posts
Discussion Starter #3
4R so 7 tooth output shaft, 3.55's, 26.6 (225/60/16's)
 

·
Registered
Joined
·
2,806 Posts
Discussion Starter #5
The trans is a 96 trans so it should be a 7 tooth drive. I'll have to check but I am pretty sure its has a tan one in there already.


Thanks Alan
 

·
Registered
Joined
·
2,806 Posts
Discussion Starter #7
The tires are kelly chargers. When I went to their site it says 26.6 as tire height.

-Miller
 

·
Registered
Joined
·
2,806 Posts
Discussion Starter #9
dirtyd0g said:
Can you measure them yourself?
I guess if you want I could get out from in front of the computer and walk out in the cold rain with my tape measure :tongue:

EDIT: Raining harder than I thought, think I will wait a few. What number did you get?
 

·
Registered
Joined
·
2,806 Posts
Discussion Starter #11
I got a .6 difference in number of teeth. 19.3 vs 19.9
 

·
Premium Member
Joined
·
6,617 Posts
miller1995 said:
I got a .6 difference in number of teeth. 19.3 vs 19.9
Me too the 19.3 calculation would make the tan (19 tooth)gear closest. The 19.9 calculation would use the orange (20 tooth) gear.
 

·
Registered
Joined
·
1,411 Posts
With 3.27's, 215/70R15, 8 tooth output, it looks like I'd need a purple 21 tooth gear, correct?
 

·
Registered
Joined
·
2,806 Posts
Discussion Starter #16
Ok finally got around to switching gears. I had a 19 tooth tan gear in the trans like I thought and went to the orang 20 tooth gear. While traveling with Tydlwavs and Blacktbird96 they both were going 60 in their Foci while I was at 58 or so mph. Should I go back down to the tan gear?

-Miller
 

·
Registered
Joined
·
1,160 Posts
Subscribe..... need to get purple 21 when come off boat.
 

·
The Parts Guy
Joined
·
7,360 Posts
Two things:

According to my calculations, a 225/60/16 tire should be 26.6299 inches tall.

225/25.4 = 8.858

(section width/millimeters per inch) = 8.858

8.858x.6x2 = 10.6299

(8.858 x aspect ratio x two sidewalls) = 10.6299

10.6299 + 16 = 26.6299

(10.6299 + wheel diameter) = 26.6299

Hope that made sense.


Now, my question is, how do you know whether you have the 7 or 8 tooth speedo drive gear? For instance, which gear would a 94 Mark 8 have? Is there a list of which transmissions have which gear?

-Rod
 
1 - 19 of 19 Posts
Top