need to know

 

They should have a different number of teeth. I have a jdm 4.7 final drive laying around and I can count them when I get home.

 

much appreciated, also if ya fany sellin it hit me with pm with askin price

 

the JDM 4.78 has 67 teeth

 

 

for future reference

4.40= 66 teeth
4.785= 67 teeth
4.928= 69 teeth

 

So Mr. tran what your telling me is that I'm rocking the 69 teether...

 

yes, grandma would be jealous

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BlueR &raquo;</TD></TR><TR><TD CLASS="quote">for future reference

4.40= 66 teeth
4.785= 67 teeth
4.928= 69 teeth</TD></TR></TABLE>

Shouldn't the numbers of teeth be in the same proportion as the gear ratios? Because they're not for the numbers shown above for the 4.40 ratio (but they are for the other two ratios, i.e. 4.785/4.928 = 67/69).

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nsxtasy &raquo;</TD></TR><TR><TD CLASS="quote">Shouldn't the numbers of teeth be in the same proportion as the gear ratios? Because they're not for the numbers shown above for the 4.40 ratio (but they are for the other two ratios, i.e. 4.785/4.928 = 67/69).</TD></TR></TABLE>

the JDM 4.785 and the ATS 4.928 both use 14 teeth pinions
the usdm 4.40 uses a 15 teeth pinion

so...

66/15= 4.40
67/14= 4.785
69/14= 4.928

 

thanks guys,

anyone know the part number for the 4.7 ?

 

you expect to walk into a USDM dealership and fork over a part number that they dont market over here?

 

im not in u.s

 

Go to http://www.jdmland.com/

And look up DC2 in there you can get a set for $399.00

 

Get the 4.9, its mucho better Ask anybody with a 4.7 and they'll all pretty much say they wish they went with the 4.9.

 

The higher the gear = more power... Am I right?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AssPenny &raquo;</TD></TR><TR><TD CLASS="quote">Get the 4.9, its mucho better Ask anybody with a 4.7 and they'll all pretty much say they wish they went with the 4.9.</TD></TR></TABLE>

its my daily driver so 4.9 will be too much

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by py &raquo;</TD></TR><TR><TD CLASS="quote">The higher the gear = more power... Am I right? </TD></TR></TABLE>

No, not more power....more acceleration with a lower top speed. It's just gearing, not a power adder, though it feels like more power.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dave_B &raquo;</TD></TR><TR><TD CLASS="quote">No, not more power....more acceleration with a lower top speed. It's just gearing, not a power adder, though it feels like more power.</TD></TR></TABLE>

Yup. More specifically...

Acceleration is a function of torque at the wheels. Torque at the wheels is torque at the crank (what you hear quoted as torque specs) times gearing, minus drivetrain losses. So, the shorter your gearing, the faster you can accelerate, assuming you're not exceeding redline (or the rev limiter). This is why your car accelerates at low speeds faster in first gear than in third gear, for example.

However, because it lowers the road speed at which you hit redline (or the rev limiter), that means you will be forced to upshift at a lower road speed. And immediately after the upshift, you will then be accelerating slower, because you will be in a higher gear, and your overall gearing is taller as a result.

Comparing two different gearing setups, the one with the shorter gearing accelerates quicker as long as both setups are in the same gear. However, for those ranges of speed where the shorter gearing forces you into a higher gear, the shorter gearing accelerates slower.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vti444 &raquo;</TD></TR><TR><TD CLASS="quote">its my daily driver so 4.9 will be too much </TD></TR></TABLE>

I daily drove my ITR with a 4.9 for over 3 years with trips to Expo 2 & 4 and alot of little trips in between

 

heard that going from 4.7 to 4.9 is a big different. but too bad, i just can't reject a deal on a 4.7, I just got it...a jdm 4.7

 

can i use the u.s 4.4 pinion with jdm/u.k itr lsd/4.4 f/d ?

ive also decided to stick with the 4.4 f/d i already have, better fuel economy, better for daily driver and 4.7 f/d are $$$$$$$. wont have additional accelaration of 4.7 but money saved will go towards more tuning time


Modified by vti444 at 11:55 AM 11/23/2005

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by neo_ &raquo;</TD></TR><TR><TD CLASS="quote">

Whats the RPMs when crusing at 80 mph?</TD></TR></TABLE>

http://www.autocrossing.com/cgi-bin/gearcalc.cgi

Knock yourself out. Been asked and answered many times before.