6 speed + 3.73 = what size speedo gear

S

spchernandez

New Member

Jun 18, 2005

28

0

0

Aug 4, 2005

#1

• Aug 4, 2005

• #1

i bought a 6 speed conversion from www.bieberfever.com and i need to know what speedo gear i need to read the right speed that i am going.

 

T

tjm73

Founding Member

Aug 3, 2000

2,418

2

48

Rush, NY

Aug 4, 2005

#2

• Aug 4, 2005

• #2

What size tire are you running? I replied to a different thread about this very kind of question. Try searching for it.

you will need to have the followign information....

1.) tire height to calculate tire rotations per mile or just tire rotations per mile
2.) driven gear count (ie is it a 6, 7 or 8 tooth drive gear?)
3.) Rear gear ratio, which we know is 3.73.

Forumula is

tire rotations per mile X driven gear X 3.73 all divided by 1000

That will tell you which speedo gear you need.

 

S

spchernandez

New Member

Jun 18, 2005

28

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0

Aug 6, 2005

#3

• Aug 6, 2005

• #3

i am running 275/40/17 in the back and 245/45/17 in the front, so how do i deturmine the tire rotation per mile, and where is the driven gear at, plus i have updated the speedometer gauge from a 85 mph to 140 mph :damnit:

 

Michael Yount

Mustang Master

Apr 10, 2002

9,039

6

79

Charlotte, NC

Aug 6, 2005

#4

• Aug 6, 2005

• #4

The speedo gear you need is a function only of your rear tire size and your rear end ratio -- the tranny has no impact on it.

 

M

macx

New Member

Jul 18, 2004

228

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0

SE Missouri near Cape Girardeau

Aug 6, 2005

#5

• Aug 6, 2005

• #5

Do a search for "speedometer calculator"
there are several, I think TCI site may have one.