# SR 5th Gear Myth Proven Facts
**URL:** https://forums.speedlife.net/t/sr-5th-gear-myth-proven-facts/84418
**Category:** SON240sx Automotive
**Created:** [March 21, 2005, 2:16pm UTC](https://forums.speedlife.net/t/sr-5th-gear-myth-proven-facts/84418 "2005-03-21T14:16:30Z")
**Posts on this page:** 17
**Page:** 1
### Author:  [@SHIFT\_KA24DET](https://forums.speedlife.net/u/SHIFT_KA24DET)
#### Post date: [March 21, 2005, 2:16pm UTC](https://forums.speedlife.net/t/sr-5th-gear-myth-proven-facts/84418/1 "2005-03-21T14:16:30Z")
Check out these interesting links…
[JDM Motor and Tranny Specs](http://www.nissansilvia.co.nz/tech/Silvia-180SX%20Table.htm)
[US USDM Motor and Tranny Specs](http://www.nissannews.com/site_library/nissan/1997vehicles/240sx/specs.shtml)
To Sum it all up…
US Spec (KA) 5th Gear: 0.759
JDM Spec (CA) 5th Gear: 0.838
JDM Spec (SR) 5th Gear: 0.759
US Spec (KA) Final Drive Ratio: 4.083
JDM Spec (CA) Final Drive Ratio: 4.363
JDM Spec (SR) Final Drive Ratio: 4.083
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### Author:  [@Sasha\_SG](https://forums.speedlife.net/u/Sasha_SG)
#### Post date: [March 21, 2005, 2:23pm UTC](https://forums.speedlife.net/t/sr-5th-gear-myth-proven-facts/84418/2 "2005-03-21T14:23:12Z")
Its Myth big guy
who was saying they were any different?
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### Author:  [@SHIFT\_KA24DET](https://forums.speedlife.net/u/SHIFT_KA24DET)
#### Post date: [March 21, 2005, 2:33pm UTC](https://forums.speedlife.net/t/sr-5th-gear-myth-proven-facts/84418/3 "2005-03-21T14:33:15Z")
> [@Sasha (Turbo)](#):
>
> who was saying they were any different?
Everybody…
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### Author:  [@Matt-chu](https://forums.speedlife.net/u/Matt-chu)
#### Post date: [March 21, 2005, 2:41pm UTC](https://forums.speedlife.net/t/sr-5th-gear-myth-proven-facts/84418/4 "2005-03-21T14:41:08Z")
All I know is that my car sucks ass on the highway, 110 and im at 3000rpm
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### Author:  [@spd-dmn](https://forums.speedlife.net/u/spd-dmn)
#### Post date: [March 21, 2005, 3:52pm UTC](https://forums.speedlife.net/t/sr-5th-gear-myth-proven-facts/84418/5 "2005-03-21T15:52:36Z")
I heard from someone here, and was corrected by the same token, that the ratios are the same but that the tranny’s final drive is lower on the SR tranny.
:dunno:
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### Author:  [@Sasha\_SG](https://forums.speedlife.net/u/Sasha_SG)
#### Post date: [March 21, 2005, 4:39pm UTC](https://forums.speedlife.net/t/sr-5th-gear-myth-proven-facts/84418/6 "2005-03-21T16:39:33Z")
i never read that?
link me
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### Author:  [@SHIFT\_KA24DET](https://forums.speedlife.net/u/SHIFT_KA24DET)
#### Post date: [March 21, 2005, 6:55pm UTC](https://forums.speedlife.net/t/sr-5th-gear-myth-proven-facts/84418/7 "2005-03-21T18:55:37Z")
The Final Drive Refers to the Rearend (Rear Diff)
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### Author:  [@spd-dmn](https://forums.speedlife.net/u/spd-dmn)
#### Post date: [March 21, 2005, 7:03pm UTC](https://forums.speedlife.net/t/sr-5th-gear-myth-proven-facts/84418/8 "2005-03-21T19:03:15Z")
Jantos you said it yourself dude:
“Yes but the final drive on the SR’s tranny is different than the one on the KA.”
Did you mean the dif that time as well?
[http://www.son240sx.ca/forum/viewtopic.php?t=9510](http://www.son240sx.ca/forum/viewtopic.php?t=9510)
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### Author:  [@NeveR](https://forums.speedlife.net/u/NeveR)
#### Post date: [March 21, 2005, 7:34pm UTC](https://forums.speedlife.net/t/sr-5th-gear-myth-proven-facts/84418/9 "2005-03-21T19:34:37Z")
> [@spd-dmn](#):
>
> Jantos you said it yourself dude:
>
> “Yes but the final drive on the SR’s tranny is different than the one on the KA.”
>
> Did you mean the dif that time as well?
>
> [http://www.son240sx.ca/forum/viewtopic.php?t=9510](http://www.son240sx.ca/forum/viewtopic.php?t=9510)
---
### Author:  [@SHIFT\_KA24DET](https://forums.speedlife.net/u/SHIFT_KA24DET)
#### Post date: [March 21, 2005, 8:32pm UTC](https://forums.speedlife.net/t/sr-5th-gear-myth-proven-facts/84418/10 "2005-03-21T20:32:42Z")
> [@spd-dmn](#):
>
> Jantos you said it yourself dude:
>
> “Yes but the final drive on the SR’s tranny is different than the one on the KA.”
>
> Did you mean the dif that time as well?
>
> [http://www.son240sx.ca/forum/viewtopic.php?t=9510](http://www.son240sx.ca/forum/viewtopic.php?t=9510)
This is why I posted this, because I was misinformed…
I was told by many people for a few years now that the 5th gear in SR
Tranny’s as with the Final Drive (Rear Diff) were infact longer due to the
Emissions standards in Japan. They wanted to keep the RPM’s down while
crusing on the highway though clearly that is all BS with these proven numbers.
This also concludes another mith that indeed the KA Speed Sensor and a
SR Speed Sensor are the same. Many people for the longest time who got
SR Motor sets used the KA sensor because they believed the Final Drive
(Rear End) Gear Ratio’s were different which would result in inacurate speed readings.
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### Author:  [@spd-dmn](https://forums.speedlife.net/u/spd-dmn)
#### Post date: [March 21, 2005, 9:05pm UTC](https://forums.speedlife.net/t/sr-5th-gear-myth-proven-facts/84418/11 "2005-03-21T21:05:14Z")
Understood.
Although, 4.08 seems a bit high to me when you’re running 300+hp. Where’s that J30 ring? 😉
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### Author:  [@mr200](https://forums.speedlife.net/u/mr200)
#### Post date: [March 22, 2005, 6:32am UTC](https://forums.speedlife.net/t/sr-5th-gear-myth-proven-facts/84418/12 "2005-03-22T06:32:42Z")
Heh, I’ve got a Q45 if someone wants it … think it’s a 3.7 LSD
What I can’t understand is why Nissan would bother with marginally different ring and pinion sets.
Guess the ca18det was really down on torque or something.
110 @ 3000 … don’t you like 5th gear passing? 😉
What about the R&P for auto cars? It should be lower (numerically)
Nismo offers crazy gearsets for the R200 too … I think they go up to a 5.88:1
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### Author:  [@DTS](https://forums.speedlife.net/u/DTS)
#### Post date: [March 22, 2005, 5:02pm UTC](https://forums.speedlife.net/t/sr-5th-gear-myth-proven-facts/84418/13 "2005-03-22T17:02:35Z")
> [@SHIFT\_SR20DET"](#):
>
> [quote=spd-dmn]. Many people for the longest time who got
> SR Motor sets used the KA sensor because they believed the Final Drive
> (Rear End) Gear Ratio’s were different which would result in inacurate speed readings.
ya andy told me to do that but i couldnt get the bolt off the ka so i said STFU and left the sr one and my speedo is fine
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### Author:  [@Uniac](https://forums.speedlife.net/u/Uniac)
#### Post date: [March 22, 2005, 7:27pm UTC](https://forums.speedlife.net/t/sr-5th-gear-myth-proven-facts/84418/14 "2005-03-22T19:27:27Z")
i belive the myth comes from the sr20de, i belive if you were to find the final drive for that you would find it to be different…people are easily confused…but then again…i could eb wrong…
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### Author:  [@SHIFT\_KA24DET](https://forums.speedlife.net/u/SHIFT_KA24DET)
#### Post date: [March 28, 2005, 8:44pm UTC](https://forums.speedlife.net/t/sr-5th-gear-myth-proven-facts/84418/15 "2005-03-28T20:44:42Z")
> [@lucky DFR](#):
>
> i belive the myth comes from the sr20de, i belive if you were to find the final drive for that you would find it to be different…people are easily confused…but then again…i could eb wrong…
Just like all JDM motors having ~60,000km on them… It’s more like ~60,000 miles which is ~100,000km
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### Author:  [@Jesse](https://forums.speedlife.net/u/Jesse)
#### Post date: [March 28, 2005, 9:07pm UTC](https://forums.speedlife.net/t/sr-5th-gear-myth-proven-facts/84418/16 "2005-03-28T21:07:35Z")
umm yeah
on the highway in my ca, 5th gear 3000rpm… 106kmph bye bye gas mileage
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### Author:  [@Uniac](https://forums.speedlife.net/u/Uniac)
#### Post date: [March 29, 2005, 4:42am UTC](https://forums.speedlife.net/t/sr-5th-gear-myth-proven-facts/84418/17 "2005-03-29T04:42:47Z")
> [@SHIFT\_SR20DET](#):
>
> [quote=lucky DFR]i belive the myth comes from the sr20de, i belive if you were to find the final drive for that you would find it to be different…people are easily confused…but then again…i could eb wrong…
Just like all JDM motors having ~60,000km on them… It’s more like ~60,000 miles which is ~100,000km[/quote]
adam don’t be a dick, prove me wrong, find the proof, like you just did…and it would make sence, the na sr20de has what 50hp less and god knows how much torque less, it only makes sence it would have a different ratio.