RB25 Trans behind a KA24DE
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RB25 Trans behind a KA24DE
I ran across an RB25 transmission for a great price and was wondering how close it comes to bolting up to the KA. I know the output shaft is bigger but I don't think that will cause me any problems because I have a Drive shaft Shop drive shaft and I believe that they can make me a new yoke that will fit the RB trans. So how close does it come to bolting up?
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I was talking to a local guy and he seems to remember that when he looked at this trans set-up that there were only two bolt holes that don't line up. One of the bolt holes in the trans bell housing he said is close enough that you can see 1/2 of the threaded hole in the block through it and the other will require a redrill. Can anyone confirm?
If that is the case, we would be able to run modified RB26 trannys as well.I just picked up a z32 tranny form a buddy for $60 (best friends discount) and will be making my own adapter and mounts. Hopefully I can start early next month some time to be ready for the track events in september.titec2 wrote:I was talking to a local guy and he seems to remember that when he looked at this trans set-up that there were only two bolt holes that don't line up. One of the bolt holes in the trans bell housing he said is close enough that you can see 1/2 of the threaded hole in the block through it and the other will require a redrill. Can anyone confirm?
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Seems to me that if I can make this work without an adapter plate it would be a much better/easer way to get the durability of a z32/rb25 trans behind the ka. I talked with the guy form the driveshaft shop and he said that he can supply me with the correct yoke to work with the driveshaft shop drive shaft I already have and fit the rb output shaft. The guy with the rb transmission is going to bring it to my shop week after next and I will let you guys know what it is goint to take to make it work.
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i heard of a guy useing a rb25 bell housing on his sr20det trans for his rb25 car when his trans went out and people local use sr bell on ka trans when there sr tran goes out. not too sure but it might work....there's a guy on ebay selling his rb25det powered coupe right now that has a bad trans in it and he has a sr trans to throw the 25 bell on to make it work.. so im leaning towards yes but i do not know.
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That is not possible......RB25 trans are 30A's, same as a Z32, and SR trans are 71C (RB20, CA18, SR20, and KA are all 71C). A 30A bell will not fit on a 71C trans......they are VERY different. What you are saying would be possible if it were using an RB20 bellhousing.....05gsxr750 wrote:i heard of a guy useing a rb25 bell housing on his sr20det trans for his rb25 car when his trans went out and people local use sr bell on ka trans when there sr tran goes out. not too sure but it might work....there's a guy on ebay selling his rb25det powered coupe right now that has a bad trans in it and he has a sr trans to throw the 25 bell on to make it work.. so im leaning towards yes but i do not know.
I'm the "local guy" BTW I have put an RB20 bellhousing on a KA block, the dowels line right up, and only 2 bolt holes need to be modified, one of them is extremely close & could be done with a die grinder in a few minutes.
The RB trans' are a little shorter overall than a KA trans, so I'm interested to see how this turns out also.....I think shifter location/driveshaft length may be a problem, but we are gonna find out.
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Just a small update... The guy what has the RB25 trans also has a Mckinney drive shaft and trans mount as well. He is scheduled to bring the whole set-up to me on the 29th of this month. I am very excited to see where all of the pieces fall. If i could impose on ZmasterB; i would like to have one of his many ka24de transmissions on hand for comparison. What do you think ZmasterB?
Yea I think we can rustle one up LOL.titec2 wrote: If i could impose on ZmasterB; i would like to have one of his many ka24de transmissions on hand for comparison. What do you think ZmasterB?
I had forgotten, I have an RB20 trans that is very dead.....but it could be used for measurement purposes, it has the same tailshaft/overall length as the 25 trans.
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Thats what I'm saying, no, the RB25/Z32 trans are 30A's (big), and the RB20's are 71C's (small, same trans as a KA/CA/SR). The bellhousing from a RB20/CA/KA/SR wont fit onto a RB25/Z32 trans.kings_blend wrote:Isnt the RB20 bellhousing compatible with the RB25/Z32 tranny then? And the McKinney driveshaft and mount are probably for the BR26 swap into an s13 or s14. Hmmm we might have all the parts readily available, we just have to put the pieces of the puzzle together.
I have a friend who is working on getting all the AWD stuff from an RB26 to work on a KA......but we'll see how that goes. The trans fits, its that oil pan/front diff thats a toughie
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+1ZmasterB wrote:Thats what I'm saying, no, the RB25/Z32 trans are 30A's (big), and the RB20's are 71C's (small, same trans as a KA/CA/SR). The bellhousing from a RB20/CA/KA/SR wont fit onto a RB25/Z32 trans.
I have a rb20 swap & the bell housing is just about the only difference btwn the ka, rb, & sr tranny. There are a few internal differences but nothing to give one more strength than the other.
A rb25 or z32 tranny on the other hand are much better, nicoclub as some good info on them
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Whatever happened to the guy running the rb25? Did he stop by and shed light on this?titec2 wrote:Seems to me that if I can make this work without an adapter plate it would be a much better/easer way to get the durability of a z32/rb25 trans behind the ka. I talked with the guy form the driveshaft shop and he said that he can supply me with the correct yoke to work with the driveshaft shop drive shaft I already have and fit the rb output shaft. The guy with the rb transmission is going to bring it to my shop week after next and I will let you guys know what it is goint to take to make it work.
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They seem to be pretty pricey, but the bell housing can be had for like 250. Can't I just grab the rb25/26 bell housing and bolt that up to the z32/pathfinder tranny? I know I'd need a custom driveshaft and I can fab up the mount if need be, but does the shifter come through the regular shifter hole?
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Also, I was wondering why we can't just redrill the z32 bellhousing to fit the ka. I mean, were essentially opening up two bolt holes with the rb25/26 or just leaving them be, so why can't I just pick up a z32 tranny and redrill some holes to mate it up with the ka?
Is it that the z32 is shaped differently or something?
Is it that the z32 is shaped differently or something?
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The z32 bell housing is not even close to matching the ka block. The rb transmissions line up you just have to wallow out two holes.
You can put the rb bell housing on the z32 tranny and bolt it up to a ka, but the shifter will be back pretty far like this. The rb shifter is similar to the ka, while the z32 is remote mount.
You can put the rb bell housing on the z32 tranny and bolt it up to a ka, but the shifter will be back pretty far like this. The rb shifter is similar to the ka, while the z32 is remote mount.
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http://zilvia.net/f/chat/270726-pics-z3 ... y-s13.html
The placement in those pictures doesnt seem that off, and that's with the adapter pushing it farther. Is the bellhousing going to push it farther back than that?
The comparison pics of the rb25 vs z32 bellhousings here makes it seem like the difference is very little (about 3/4 of the way down the page):
http://www.houston-nissans.com/index.php?topic=953.0
The placement in those pictures doesnt seem that off, and that's with the adapter pushing it farther. Is the bellhousing going to push it farther back than that?
The comparison pics of the rb25 vs z32 bellhousings here makes it seem like the difference is very little (about 3/4 of the way down the page):
http://www.houston-nissans.com/index.php?topic=953.0
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my 2 cents
stock KA / SR trans- i usually break them at 400+ whp.
(please take into consideration that i drift my car and clutch kicking should be factored...well i would think)
Z32 trans with the MAZworks kit- I would say this is your best option. This kit comes with everything you need such as drive shaft and shifter placement.
RB25 trans has the internals as the z32 trans. In order to make the Rb25 trans fit the two top hole need to get drilled out a bit. Then you need the drive shaft made. (since i dont street drive the car i dont care about the speedo)
RB25 Belt housing could fit on the z32 trans but the shifter placement would be wrong and you would still need to made a drive shaft.
stock KA / SR trans- i usually break them at 400+ whp.
(please take into consideration that i drift my car and clutch kicking should be factored...well i would think)
Z32 trans with the MAZworks kit- I would say this is your best option. This kit comes with everything you need such as drive shaft and shifter placement.
RB25 trans has the internals as the z32 trans. In order to make the Rb25 trans fit the two top hole need to get drilled out a bit. Then you need the drive shaft made. (since i dont street drive the car i dont care about the speedo)
RB25 Belt housing could fit on the z32 trans but the shifter placement would be wrong and you would still need to made a drive shaft.