Sr20det transmission swap to KA dohc transmission - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

sepulchral · 11-05-2006, 02:57 PM

After searching for 30minutes using vBulletin's "Awesome" search form i give up

To go from redtop sr20det transmission to using a replacement Dohc KA transmission, is there anything i must to besides swapping the bellhousing of the SR to the KA trans? any needed gaskets that need replaced?

tips, writeups, whatever welcome!

thanks

projectRDM · 11-05-2006, 07:29 PM

None. Little RTV for sealing, that's it.

Slidin240Wayz · 11-05-2006, 08:19 PM

What about the little bolt behind the fork. I know something has to be rearanged, but I don't know what.

Carlos

sepulchral · 11-05-2006, 10:33 PM

Quote:

Originally Posted by Slidin240Wayz

What about the little bolt behind the fork. I know something has to be rearanged, but I don't know what.

Carlos

you mean the ball? can you explain or remember what needs to be done?

sepulchral · 11-06-2006, 04:28 PM

anyone? ?

blownoffvalve · 11-08-2006, 01:29 AM

i never knew that could be done

GSXRJJordan · 11-08-2006, 01:59 AM

Quote:

Originally Posted by boosteddet

i never knew that could be done

wow...

Yeah the bellhousing is easy, and it's always good to throw a new TO bearing in there. If you use the z32 TO bearing (like some clutches say to use), you need a diff fork. Always check the condition of your slave cylinder also, cause its easier to replace the slave first than have the swap not go right, tear it all apart, and realize it was your slave all along. Yeah... been there...

projectRDM · 11-08-2006, 09:43 AM

Quote:

Originally Posted by boosteddet

i never knew that could be done

I never knew people could be so fucking stupid. Apparently we were both misinformed.

sepulchral · 11-09-2006, 09:27 AM

all that i knew, ok, so i dont need anew fork, or anything whatever, im doing it this weekend, ill post some pics

BigVinnie · 11-09-2006, 08:53 PM

I am still scratching my head......
How are you using a KA gear box on a sr bellhousing??????
Both use the werner synchros gear system but both are sooooooo completely different, lengths with bell housing and all as well as the spline itself.
WTF I gotta see this one to believe it........
In all reality just get a freakin SR tranny, you can get them used for under $300 and then get it rebuilt....
Even if it carries an FS5W71C tranny number doesn't at all mean its compatible, unless of course you go through the parts bin of engines like VG,VH,KA,L,LZ, and Z engines with similar bell housings and gear box lengths.

projectRDM · 11-09-2006, 09:18 PM

Quote:

Originally Posted by BigVinnie

I am still scratching my head......
How are you using a KA gear box on a sr bellhousing??????
Both use the werner synchros gear system but both are sooooooo completely different, lengths with bell housing and all as well as the spline itself.
WTF I gotta see this one to believe it........
In all reality just get a freakin SR tranny, you can get them used for under $300 and then get it rebuilt....
Even if it carries an FS5W71C tranny number doesn't at all mean its compatible, unless of course you go through the parts bin of engines like VG,VH,KA,L,LZ, and Z engines with similar bell housings and gear box lengths.

You're joking right? This has been covered more times than S14 seats in to S13s.

KA, SR, CA, VG30E, RB20, all use the EXACT SAME TRANSMISSION. Only the bellhousing is different, and in some cases there's a different 5th gear. Direct swap with just a few bolts.

I know for a fact I typed that in large, bold print a minimum of three times this year.

BigVinnie · 11-09-2006, 09:26 PM

Quote:

Originally Posted by R240NA

You're joking right?

No not joking just never delt with sr trannys. I also haven't been around the forums for a while or worked on cars for the last year. It's also easier for me to recall what I have worked on. I also know that tranny lengths using FS5W71c's vary in length depending on what vehicle it came out of. Spline length and teeth vary as well, not that it really matters. Thanks for the update...

Quote:

Originally Posted by R240NA

KA, SR, CA, VG30E, RB20, all use the EXACT SAME TRANSMISSION. Only the bellhousing is different, and in some cases there's a different 5th gear. Direct swap with just a few bolts.

I believe the 5th gear ratio of the CA transmission is only different.
Z series engines used different variant 1st through 5th gears depending if it was a z20,z22,z24 engine car ,or truck

sepulchral · 11-10-2006, 07:00 AM

well hopefully ill have a longer 5th gear for all the 400mile trips to and from wvu to richmond

sunnys14 · 11-11-2006, 12:05 AM

you CAN use a KA tranny on a SR, just swap the front bell housings. ALOT of people say theyre EXACTLY the same, but theyre not. some guy on fresh alloy tested both trannies in each gear and KA and SR tranny had diff max speed at redline in EACH gear.

sepulchral · 11-12-2006, 10:06 AM

is ka shorter or longer?

robertftw · 11-12-2006, 10:19 AM

does anyone know gear ratios for the diffrent trannys, and if you can swith them between the gear boxes, or if you can by aftermarket gearsets, if so where? i never hear anyone playing with that kinda stuff for 240's. thanx and sorry if im changing the topic.

crazyikimasho · 11-12-2006, 10:42 AM

KA24DE/E
1st- 3.321
2nd- 1.902
3rd- 1.308
4th- 1.000
5th- 0.759

SR20DET (S13/S14)
1st- 3.321
2nd- 1.902
3rd- 1.308
4th- 1.000
5th- 0.838

SR20DET (S15)
1st- 3.626
2nd- 2.20
3rd- 1.541
4th- 1.213
5th- 1.000
6th- 0.767

Seikenman · 02-04-2007, 07:01 PM

Quote:

Originally Posted by justified2.4

SR20DET (S13/S14)
1st- 3.321
2nd- 1.902
3rd- 1.308
4th- 1.000
5th- 0.838

Sorry to bump this, but I was searching about bell housing swaps and this information is wrong. The only Turbo S chassis with a .838 5th gear is the 1st generation S13 with a CA18DET(At least I think so. I get conflicting information on the 5th gear. Some sources say it's .838 and some say it's .759). Here's a chart with all the gear ratios. The KA24 trans (E and DE) have the same ratios as a SR20DET trans

sepulchral · 11-12-2006, 01:58 PM

what is that ratio> will i be at a higher rpm at the same speed in 5th with a KA TRANS? or a lower rpm at the same speed, in comparison to the sr trans

so say im 70mph at 3800rpm in sr
will it be higher speed or lower with KA transmssion at 3800rpm?

sepulchral · 11-13-2006, 06:56 AM

Anyone know the answer to this^

***S14DB*** · 11-13-2006, 07:39 AM

Smaller the number the faster you will be going at the same RPM.

sepulchral · 11-13-2006, 04:39 PM

im guessing swapping out a 5th gear is hard work

King 240 · 02-05-2007, 02:00 AM

I'm glad I found this thread. I just busted my SR20DET transmission this weekend and will be swapping the KA24E transmission with the SR bellhousing.

This help clear up alot of questions I had.

Thought I do still have one, about the diffrent 5th gear ratio, will I be at a high speed at a lower RPM with the KA transmission compared to the SR transmission?

Seikenman · 02-05-2007, 12:53 PM

delete delete

pr240sx · 02-05-2007, 06:31 AM

Include 84~89 NON turbo cars
they also have the same 240sx trannies.
Only a bellhousing swap is needed

nismosil40zx · 02-05-2007, 07:28 AM

I just did the swap to my s13...easiest thing ever. Everything just plugs in and bolts up.

Inlandsilvia · 02-05-2007, 07:35 AM

how funny is this...I just did a ka to sr transmission swap last night...total time to put it all together was about 1 hour. it was my first time so...I think next time it will be even faster. six bolts, 1 retaining thingy on the input shaft and bam the housing is off...some RTV and bam it's a sr mission.

King 240 · 02-05-2007, 04:29 PM

Yeah the transmission I'll be replacing is a SR20DET transmission. I'll be replacing it with a KA transmission.
So I'll be at a lower RPM in 5th but at a higher speed, correct?

Seikenman · 02-06-2007, 08:16 PM

Quote:

Originally Posted by King 240

Yeah the transmission I'll be replacing is a SR20DET transmission. I'll be replacing it with a KA transmission.
So I'll be at a lower RPM in 5th but at a higher speed, correct?

No. They're the same

King 240 · 02-07-2007, 01:39 PM

Yeah I found this out after finally finding the gear ratios.
I'll be performing the swap either tonight or tomorrow.

11-05-2006, 02:57 PM	#1
sepulchral BANNED Join Date: Mar 2004 Location: Midlothian. VA Posts: 2,050 Trader Rating: (0) Feedback Score: 0 reviews	Sr20det transmission swap to KA dohc transmission After searching for 30minutes using vBulletin's "Awesome" search form i give up To go from redtop sr20det transmission to using a replacement Dohc KA transmission, is there anything i must to besides swapping the bellhousing of the SR to the KA trans? any needed gaskets that need replaced? tips, writeups, whatever welcome! thanks

11-05-2006, 08:19 PM	#3
Slidin240Wayz Post Whore! Join Date: Jan 2005 Location: Everywhere Age: 40 Posts: 5,427 Trader Rating: (9) Feedback Score: 9 reviews	What about the little bolt behind the fork. I know something has to be rearanged, but I don't know what. Carlos __________________ Support Zilvia by purchasing a sticker!

11-09-2006, 08:53 PM	#10
BigVinnie Zilvia FREAK! Join Date: Apr 2003 Location: Walnut Crizzle, Crackifornia Age: 46 Posts: 1,266 Trader Rating: (0) Rides Gallery: BigVinnie Feedback Score: 0 reviews	I am still scratching my head...... How are you using a KA gear box on a sr bellhousing?????? Both use the werner synchros gear system but both are sooooooo completely different, lengths with bell housing and all as well as the spline itself. WTF I gotta see this one to believe it........ In all reality just get a freakin SR tranny, you can get them used for under $300 and then get it rebuilt.... Even if it carries an FS5W71C tranny number doesn't at all mean its compatible, unless of course you go through the parts bin of engines like VG,VH,KA,L,LZ, and Z engines with similar bell housings and gear box lengths. __________________

11-12-2006, 10:42 AM	#17
crazyikimasho Nissanaholic! Join Date: Mar 2002 Location: SoCal Posts: 2,329 Trader Rating: (6) Feedback Score: 6 reviews	KA24DE/E 1st- 3.321 2nd- 1.902 3rd- 1.308 4th- 1.000 5th- 0.759 SR20DET (S13/S14) 1st- 3.321 2nd- 1.902 3rd- 1.308 4th- 1.000 5th- 0.838 SR20DET (S15) 1st- 3.626 2nd- 2.20 3rd- 1.541 4th- 1.213 5th- 1.000 6th- 0.767 __________________ *PLEASE NOTE* I am no longer affiliated with West Covina Nissan.

11-13-2006, 07:39 AM	#21
*S14DB* AFC #1 Join Date: Oct 2003 Location: 昨晩あなたのお母さんの家 Posts: 20,181 Trader Rating: (3) Feedback Score: 3 reviews	Smaller the number the faster you will be going at the same RPM. __________________ Comments should be taken as Opinions not as Statements of Fact

11-05-2006, 07:29 PM	#2
projectRDM Post Whore! Join Date: Dec 2002 Location: Atlanta Age: 51 Posts: 13,812 Trader Rating: (12) Feedback Score: 12 reviews	None. Little RTV for sealing, that's it.

11-06-2006, 04:28 PM	#5
sepulchral BANNED Join Date: Mar 2004 Location: Midlothian. VA Posts: 2,050 Trader Rating: (0) Feedback Score: 0 reviews	anyone? ?

11-08-2006, 01:29 AM	#6
blownoffvalve Leaky Injector Join Date: Oct 2006 Location: cali Posts: 108 Trader Rating: (0) Feedback Score: 0 reviews	i never knew that could be done

11-09-2006, 09:27 AM	#9
sepulchral BANNED Join Date: Mar 2004 Location: Midlothian. VA Posts: 2,050 Trader Rating: (0) Feedback Score: 0 reviews	all that i knew, ok, so i dont need anew fork, or anything whatever, im doing it this weekend, ill post some pics

11-10-2006, 07:00 AM	#13
sepulchral BANNED Join Date: Mar 2004 Location: Midlothian. VA Posts: 2,050 Trader Rating: (0) Feedback Score: 0 reviews	well hopefully ill have a longer 5th gear for all the 400mile trips to and from wvu to richmond

11-11-2006, 12:05 AM	#14
sunnys14 Zilvia FREAK! Join Date: Mar 2006 Location: a land far far away... Posts: 1,549 Trader Rating: (19) Feedback Score: 19 reviews	you CAN use a KA tranny on a SR, just swap the front bell housings. ALOT of people say theyre EXACTLY the same, but theyre not. some guy on fresh alloy tested both trannies in each gear and KA and SR tranny had diff max speed at redline in EACH gear.

11-12-2006, 10:06 AM	#15
sepulchral BANNED Join Date: Mar 2004 Location: Midlothian. VA Posts: 2,050 Trader Rating: (0) Feedback Score: 0 reviews	is ka shorter or longer?

11-12-2006, 10:19 AM	#16
robertftw Zilvia Member Join Date: Sep 2006 Location: florida Posts: 148 Trader Rating: (8) Feedback Score: 8 reviews	does anyone know gear ratios for the diffrent trannys, and if you can swith them between the gear boxes, or if you can by aftermarket gearsets, if so where? i never hear anyone playing with that kinda stuff for 240's. thanx and sorry if im changing the topic.

11-12-2006, 01:58 PM	#19
sepulchral BANNED Join Date: Mar 2004 Location: Midlothian. VA Posts: 2,050 Trader Rating: (0) Feedback Score: 0 reviews	what is that ratio> will i be at a higher rpm at the same speed in 5th with a KA TRANS? or a lower rpm at the same speed, in comparison to the sr trans so say im 70mph at 3800rpm in sr will it be higher speed or lower with KA transmssion at 3800rpm?

11-13-2006, 06:56 AM	#20
sepulchral BANNED Join Date: Mar 2004 Location: Midlothian. VA Posts: 2,050 Trader Rating: (0) Feedback Score: 0 reviews	Anyone know the answer to this^

11-13-2006, 04:39 PM	#22
sepulchral BANNED Join Date: Mar 2004 Location: Midlothian. VA Posts: 2,050 Trader Rating: (0) Feedback Score: 0 reviews	im guessing swapping out a 5th gear is hard work

02-05-2007, 02:00 AM	#23
King 240 Banned from the Marketplace Join Date: Nov 2002 Location: College Station,TX Age: 40 Posts: 449 Trader Rating: (0) Feedback Score: 0 reviews	I'm glad I found this thread. I just busted my SR20DET transmission this weekend and will be swapping the KA24E transmission with the SR bellhousing. This help clear up alot of questions I had. Thought I do still have one, about the diffrent 5th gear ratio, will I be at a high speed at a lower RPM with the KA transmission compared to the SR transmission?

02-05-2007, 12:53 PM	#24
Seikenman Join Date: Dec 2005 Location: usa Posts: 46 Trader Rating: (6) Feedback Score: 6 reviews	delete delete Last edited by Seikenman; 10-06-2013 at 01:23 AM..

02-05-2007, 06:31 AM	#25
pr240sx Zilvia Addict Join Date: Jan 2002 Posts: 627 Trader Rating: (0) Feedback Score: 0 reviews	Include 84~89 NON turbo cars they also have the same 240sx trannies. Only a bellhousing swap is needed

02-05-2007, 07:28 AM	#26
nismosil40zx Leaky Injector Join Date: Aug 2005 Location: Indiana Age: 39 Posts: 82 Trader Rating: (0) Feedback Score: 0 reviews	I just did the swap to my s13...easiest thing ever. Everything just plugs in and bolts up.

02-05-2007, 07:35 AM	#27
Inlandsilvia Zilvia FREAK! Join Date: Sep 2005 Location: Murrieta (Socal) Posts: 1,031 Trader Rating: (25) Feedback Score: 25 reviews	how funny is this...I just did a ka to sr transmission swap last night...total time to put it all together was about 1 hour. it was my first time so...I think next time it will be even faster. six bolts, 1 retaining thingy on the input shaft and bam the housing is off...some RTV and bam it's a sr mission.

02-05-2007, 04:29 PM	#28
King 240 Banned from the Marketplace Join Date: Nov 2002 Location: College Station,TX Age: 40 Posts: 449 Trader Rating: (0) Feedback Score: 0 reviews	Yeah the transmission I'll be replacing is a SR20DET transmission. I'll be replacing it with a KA transmission. So I'll be at a lower RPM in 5th but at a higher speed, correct?

02-07-2007, 01:39 PM	#30
King 240 Banned from the Marketplace Join Date: Nov 2002 Location: College Station,TX Age: 40 Posts: 449 Trader Rating: (0) Feedback Score: 0 reviews	Yeah I found this out after finally finding the gear ratios. I'll be performing the swap either tonight or tomorrow.