Rb25de/t 5spd At Tiptronic And Harness

[IvoryJ30t]

yeah. the bellhousing is integral [one piece] with the front transmission case. unbolt the front cases of both trannies and swap.

[IvoryJ30t]

you see how the transmission is one piece in the front, then the center plate and the rear housing bolt together?

unbolt there, and swap front cases.

[IvoryJ30t]

if you blow up your transmission, remove the one bolted to the rb, take your "new" ka transmission, and swap cases.

then take your blown transmission and useless ka front case, and throw away.

[Rex]

From what I can find they offered 2 different automatic's for the inline 6 cylinder Skyline

• M-ATx: Dualmatic M-ATx full-range electronically controlled 4-speed automatic transmission with a manual shift mode
• E-ATx: full-range electronically controlled 4-speed automatic transmission with a wide lockup range

Sounds like you're looking for the first of these, and it was offered on the 25-GT Turbo & 25-GT V. You may want to get the steering wheel, "Models fitted with the M-ATx automatic transmission also have shift buttons mounted on the steering wheel." (according to a 2000 Nissan-Global press release)

More from same press release..."The Skyline also comes with the "Dualmatic M-ATx" transmission, a new automatic gearbox featuring a manual shift mode. The Dualmatic M-ATx combines the driving ease of an automatic transmission with the direct shiftability of a manual gearbox. With this transmission, the engine brake clutch is engaged to quicken acceleration or deceleration response to throttle inputs in all gear positions, which vastly improves the direct G feeling in relation to the operation of the throttle. Shifting is possible either by the shift lever or by the shift buttons mounted on the steering wheel, thus providing a "dualmatic" feature for enhanced driving performance befitting the Skyline."

NICE find while researching the Dualmatic M-ATx

According to this 2001 press release "Adopted as the gearbox on the 3.0-liter models to provide smooth, crisp shifting together with improved fuel economy is the 5M-ATx full-range electronically controlled 5-speed automatic transmission with a manual shift mode and incorporating a new shift pattern." Looks like it may only be offered on the 3.0 liter V6??

[IvoryJ30t]

no, theres a 5 speed tiptronic auto also. it came on the R34, and possibly some R33.

[Wulfgang]

Ok, hang on. I am getting confused. The KA front case/bellhousing will not bolt to the RB20 because although it is the same length, it has a different bolt pattern.

The rear part of the KA transmission is 2" longer than the RB rear part. If I take the RB front case/bellhousing and bolt it to the KA transmission, the shifter will be 2" farther back, and I'm sure the mounts would not line up. Are you talking about an internal swap? I don't see how mixing and matching with the cases would work.

[IvoryJ30t]

no, i meant the whole transmission, not the internals.

your sure the KA rear case is off by that much?

[IvoryJ30t]

well, you guys had me thinking all night about the 5 speed auto.

i would love to have a 5 speed auto, but i just dont know how long it would stand up to a RB26 pushing a 3600 lb car around.

i also dont want to go through the trouble of sourcing the transmission, wiring, computer, and shifter just to have it blow up and have to pull the car apart to convert to manual.

[PROJECTRB240SX]

I'LL BUILD MY ENGINE AND I'M DEFINATELY USING THIS transmission SO, YOU'LL SEE HOW MUCH IT CAN TAKE.

[NISMO_RB25]

3600lb car? what are you putting it in a supra?

[IvoryJ30t]

hey, if it works out i think im in.

no cutting up the transmission tunnel, mounting new pedals, clutch master, running the line, ect etc...

do they make rebuild kits/upgraded clutchs for it? is it r34 only, or did it come in the 33 also?

[PROJECTRB240SX]

INFINITI J30

[IvoryJ30t]

the J. removing the VG is gonna save some weight, but im 200 lbs, so with the rb and me, it will probably be like 3600 lbs.

[PROJECTRB240SX]

AS FAR AS I KNOW ITS ONLY R34 GT AND GT-TTHE NEO RB25DE AND RB25DET MOTORS.

AS FAR AS UPGRADES GO I'M NOT SURE AS OF YET BUT IT IS PROBABLY THE SAME AS THE 350Z 5SPD TIPTRONIC OR THE G35 COUPE.

[IvoryJ30t]

hey, if it ill hold up i cant complain. brake torqueing the boost up, and holding boost through the shifts.

[IvoryJ30t]

i wonder how much of a pain it will be to get the steering wheel and the steering hub w/ contacts for the tiptronic.

[NISMO_RB25]

just put the buttons on the dead pedal and shift with your foot

[IvoryJ30t]

im just wondering how hard it would be to get the needed parts since im not getting an rb25 clip.

[PROJECTRB240SX]

I AM TRYING TO FIND EVERYTHING.... I HAVE A GUY IN AUSSIELAND RIGHT NOW WITH ONE GETTING A QUOTE ON SHIPPING BUT HE IS SAYING THAT HE'LL CHARGE ME $1050 SHIPPED UNLESS SHIPPING IS REALLY HIGH, FOR EVERYTHING I NEED.

[IvoryJ30t]

cool, ill be keeping an eye on your project.

[PROJECTRB240SX]

NO PROBLEM I JUST HAVE TO GET ALL THE PARTS, AND GET FROSTED FLAKES SWAPPED OVER.

[IvoryJ30t]

the transmission is the only major issue i have to iron out. the placement of the console cutout for the auto shifter is a little too far forward. i cant decide if i want to try to get the JDM console with the handbrake [car has foot brake, not sure if it would interfere with clutch pedal assembly]. im gonna get both the rb25 manual transmission and the z32 transmission to see which would line up better.

i figure if the stick is to far forward when placed in the console, i would get a short shifter [to compensate for the extension] and weld an extension angled back to place the shifter in a comfortable position.

either that or just go with the auto.

all this is adding up to one hell of a price, so im not gonna be able to do it for some time anyway so it gives me plenty of time to get the setup correct.

ill see how the auto works out for you.

[PROJECTRB240SX]

WELL THE 350Z AUTO IS THE SAME AS THIS AUTO EXCEPT FOR THE BELL HOUSING AND SHIFTER ASSEMBLY.

[Wulfgang]

no, i meant the whole transmission, not the internals.

your sure the KA rear case is off by that much?

I'm pretty sure. I had both trannies out side-by-side, so I measured them. KA is 2" longer and shifter sits 5/8" closer to the back of the transmission than the RB (which is why people say the shifter sits a bit forward after the swaps).

[IvoryJ30t]

so the shifter is 5/8 inch further back than the rb, or 2 5/8?

[PROJECTRB240SX]

INTERNALLY THEY ARE THE SAME.... ONE OF THE GUYS I WORK WITH SAYS THAT HE'LL SWAP FRONT CASES FOR ME TO SEE IF ITS POSSIBLE. SO UHH DOES ANYONE OUT THERE HAVE A BLOWN RB20 transmission? OR JUST THE FRONT CASE?

I HAVE TWO KA TRANNIES TO USE....

[IvoryJ30t]

yeah, its a difference in the rear case because the ka is a 4 cylinder. if the shifter is slightly rearward with that combo, it might wind up sitting better in the car than the rb transmission.

the shaft spacing and gearing is identical, the ka transmission just has a longer rear case/output shaft.

[Wulfgang]

1. Shifter sits in correct location with KA.

2. Shifter sits 5/8" too far forward with RB.

3. Shifter with RB front case and KA transmission would be 2" too far back (compared to #1), but 2-5/8" farther back than #2.

[IvoryJ30t]

not too far off. i would rather have the shifter be closer than be further, and its sure cheaper and easier to pick up a ka transmission than an rb transmission.

[rbsileighty]

I have a blown RB20 trans.

Do any of these KA-T guys (or anyone else) know if there is a KA trans strengthening kit?