Speedo gear for 4r70w?

281CI96Coupe

Member

Oct 30, 2006

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Feb 6, 2008

#1

• Feb 6, 2008

• #1

I searched the forum and couldn't find any answer, I would do a speedcal, but there kind of expensive. I was wondering do you need the 23tooth gear for 3.73's? I thought it was the purple gear? And second should I just 3.55's because they sell the proper speedo gear for it? Decisions.....I really want 3.73's though

Cliff Notes: 3.73 - Proper speedo gear?
3.55's are they worth it? Saw proper speedo gear for it.

Nate

 

CobraRed_96_GT

Active Member

May 20, 2006

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Feb 6, 2008

#2

• Feb 6, 2008

• #2

dont go to a 3.55 from a 3.08. 3.73 or 3.90 for sure

 

S

san~man

O-G

Founding Member

Nov 29, 1999

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A little grass shack on a big lava rock

Feb 6, 2008

#3

• Feb 6, 2008

• #3

You can't use a speedo gear in the 4R.

 

281CI96Coupe

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Oct 30, 2006

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Feb 6, 2008

#4

• Feb 6, 2008

• #4

Really? You might be right. So there is no choice but to get a speedcal? I hear ya chris..... Oh yeah can SCT tuner fix this?

 

G

Greenbird

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Dec 19, 2004

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Feb 6, 2008

#5

• Feb 6, 2008

• #5

san~man said:

You can't use a speedo gear in the 4R.

Click to expand...

Wrong.

96-98 you NEED a speedo gear or speedcal, AND a tune to fix the shift points.
99-04 you don't need a gear or speedcal, you can fix the speedo in the tune. But nothing is stopping you from installing them.

I would stay with the stock gear and use a speedcal (I have an abbott ERA). It will be more accurate and more reliable. The 21 and 23 tooth gears tend to break, the stock 19 tooth do not.

 

CobraRed_96_GT

Active Member

May 20, 2006

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UCSD/La Jolla

Feb 6, 2008

#6

• Feb 6, 2008

• #6

so technically my shift points are off in my 4R?

 

281CI96Coupe

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Oct 30, 2006

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Feb 7, 2008

#7

• Feb 7, 2008

• #7

Can the SCT Tuner Xcal2 fix the axle ratio on the 96-98's?

 

T

TGJ

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Mar 30, 2005

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Feb 7, 2008

#8

• Feb 7, 2008

• #8

Greenbird said:

Wrong.

96-98 you NEED a speedo gear or speedcal, AND a tune to fix the shift points.
99-04 you don't need a gear or speedcal, you can fix the speedo in the tune. But nothing is stopping you from installing them.

I would stay with the stock gear and use a speedcal (I have an abbott ERA). It will be more accurate and more reliable. The 21 and 23 tooth gears tend to break, the stock 19 tooth do not.

Click to expand...

This info is correct, the only thing, the 21 tooth gear do not break like the 23 ones do. It is not that common.

281CI96Coupe said:

Can the SCT Tuner Xcal2 fix the axle ratio on the 96-98's?

Click to expand...

No, you cannot.

 

S

san~man

O-G

Founding Member

Nov 29, 1999

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Feb 8, 2008

#9

• Feb 8, 2008

• #9

I stand corrected

 

nyuk98gt

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Oct 10, 2000

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Feb 8, 2008

#10

• Feb 8, 2008

• #10

281CI96Coupe:

Go with "greenbird's" advice! I've done the same thing, stock VSS gear (orange) and a SpeedCal. My speedo/odo are dialed in to near-perfection.

You need to adjust the shift points for two reasons: the N/V (rpm/speed ratio) changes and the rate of RPM change is much higher with the numerically higher rear gears.

GL!

Chris