SR Transmission question

[LilRebel57]

I'm going to be buying a new trans soon and was wondering if it ends up having some worn out gears or syncros, can I just use a KA rebuild kit? Or a will they not fit in there correctly? Any guidance from people more experienced with this is appreciated :)

[Rb26kouki]

Just buy a 350z trans with a conversion kit and never have to worry about doing anything to it
It will cost you the same if you rebuild a SR/KA trans

[rightcoastimports]

Just buy a 350z trans with a conversion kit and never have to worry about doing anything to it
It will cost you the same if you rebuild a SR/KA trans

pretty sure you have to make clearance for it though.
Z32 5 speed works too (with adapter).
SR and KA trans are the same apart from the bell housing i believe so youd have to swap that part.

[slider2828]

Well I thought it was that easy just to buy any 350z or G35 tranny, but this isn't true either
You have to get the cd009 transmission which had better synchros and gears. That came on very specific cars and years.

At this point, I just given up because there are cd008, cd001, cd006 and even 5 speed trannies and all the junk in between... How do you check which tranny? You have to get the vin and run the vin through z1motorsports or someone who has a nissan part number database....

yeah wish it was that easy... BUT if you do end up with a CD009 tranny, then you can get the mazworx adapter and its almost straight bolt on. If you get a z32 5 speed tranny, then that is more like a cut and weld bell housing first then bolt on.... NOT as easy either. All Z32 and CD009 tranny will go into the tunnel.

Here is another tip. If you get a z32 tranny, don't get the one with the bolt on flywheel spacer, that wobbles a little or goes on crooked and you are in a bad situation....

SO down to the question you want answer to. If you get a SR tranny or KA, there are two rebuild kits. One with and one without a reverse synchro. Which one you need? You won't have any idea until you crack it open. Also if have a SR tranny, you also need to source some baulk rings from an xterra as well on top of the KA rebuild kit.

Good luck. I recently did a lot of research on this.... for the rebuild, here is a good reference thread....

http://zilvia.net/f/showthread.php?t=417958&page=2

[LilRebel57]

Well I thought it was that easy just to buy any 350z or G35 tranny, but this isn't true either
You have to get the cd009 transmission which had better synchros and gears. That came on very specific cars and years.

At this point, I just given up because there are cd008, cd001, cd006 and even 5 speed trannies and all the junk in between... How do you check which tranny? You have to get the vin and run the vin through z1motorsports or someone who has a nissan part number database....

yeah wish it was that easy... BUT if you do end up with a CD009 tranny, then you can get the mazworx adapter and its almost straight bolt on. If you get a z32 5 speed tranny, then that is more like a cut and weld bell housing first then bolt on.... NOT as easy either. All Z32 and CD009 tranny will go into the tunnel.

Here is another tip. If you get a z32 tranny, don't get the one with the bolt on flywheel spacer, that wobbles a little or goes on crooked and you are in a bad situation....

SO down to the question you want answer to. If you get a SR tranny or KA, there are two rebuild kits. One with and one without a reverse synchro. Which one you need? You won't have any idea until you crack it open. Also if have a SR tranny, you also need to source some baulk rings from an xterra as well on top of the KA rebuild kit.

Good luck. I recently did a lot of research on this.... for the rebuild, here is a good reference thread....

http://zilvia.net/f/showthread.php?t=417958&page=2

Thank you so much!

[kyral]

https://www.allstategear.com/FS5W71-s/2796.htm

are the SR and KA trans actually the same internally? i thought they were slightly different but can swap the entire assembly to different bellhousings
I think KA is the fs5w71 "c" (can anyone confirm this?

The synchro hubs and sleeves are probably inerchangeable between the two transmissions. unless the sr uses a synchro reverse gear then the 5th hub syncho would be different bewteen the two.

I also heard the Sr trans MIGHT have a different gear ratio. Not 100% sure about this tho

be careful if you take it apart there is a lot of ball bearing and springs that can go flying or fall out and get lost
And the bigger of the two shaft nuts is revearse threaded and i used a 6 point trailer hitch wrench to get it off

[slider2828]

The gears and synchro sleeves are the same. The baulk ring between ka and sr are different.... Everything else is the same

[kyral]

The gears and synchro's are the same. The baulk ring between ka and sr are different.... Everything else is the same

Baulk rings, these are the synchro rings right? the yellow brass rings with teeth

[slider2828]

Baulk rings, these are the synchro rings right? the yellow brass rings with teeth


Yup!... another way of saying syncrhos....

[Kingtal0n]

The gears and synchro sleeves are the same. The baulk ring between ka and sr are different.... Everything else is the same

there are lots of little differences throughout the trans (KA vs SR), and again through the years. Some SR trans are different from other SR trans, for example. I took apart a couple KA transmissions trying to get parts for an SR trans rebuild and just couldn't find the parts I needed. For example the plate that bolts over the bearings on the front of the transmission was completely different from one to the next. One had an overhang for the reverse gear cut in it that wouldn't fit the next trans. And then theres the forks, some SR trans always break 5th gear fork and need the new 'updated' fork you can't take from a KA trans, it must be purchased.

The SR uses the same baulk ring for 1st as it does for 4th
and it uses the same two between 2nd and 3rd also (it is a two piece design, expensive)
Some have synchronized reverse, some do not.

Currently there is no rebuild kit for SR specific trans. In the past I had to order two 2x KA kits to rebuild 1x SR trans. Now however, I am fairly sure you can order only the pieces you want, you just need to know where they come from (I think its a 98 Xterra transmission that uses the SR baulk rings iirc)

[brndck]

there is a 100% solid way to confirm if a z33 trans is cd009 or not, but it does require removing the rear tail shaft of the trans.

I covered it fairly extensively

http://outslidersandsmokeproduce.blogspot.com/2015/06/z33-cd009-trans-shit.html
pix links aren't working but I included the link to fsm below
http://pdf.textfiles.com/manuals/AUTOMOBILE/NISSAN/350Z/coupe/2005/mt.pdf
disassembly starts on page 26, the critical part is the diagram at the bottom of page 33 (cd008) and the diagram at the top of page 34 (cd009)

they have distinctly different parts (008 is a 2pc cover, 009 is 1pc)