Using the RB26 transmission...

[driftjunke]

Anyone have some insight on converting the 26 awd transmission to rwd?

E

[themadscientist]

not worth the trouble, just get an RB25DET transmission.

[CursedGTR]

I second that, plus the RB25DET and the RB26DETT trannies have identical internal gears and the RB25DET mission will hold 700 or so HP so why not just go with what people have made kits for already instead of spending money to have another type of driveshaft made (flange type instead of the RB25DET spline type) and the transfer case cutoff and welded, really not worth it.

Mike your gasket is at the shop with tom, I have the headbolts for you here at the house.

[Imissmyturbo]

The best resound out there is the fact that people ask way too much for rb25 transmission's. 500-600 would be a fair price unlike the 800-1200 you see.You can't even sell your RB26 transmission for $50. So why not try and use it?

[lee.]

This was brought up before.

zerothread?id=134736

[REDLN]

Does anyone have one for sale? I would like to try and put one my zenki

[themadscientist]

The best resound out there is the fact that people ask way too much for rb25 transmission's. 500-600 would be a fair price unlike the 800-1200 you see.You can't even sell your RB26 transmission for $50. So why not try and use it?

if it takes $950.00 to modify it then is it worth it? You asked the question, I'm sorry the answer is not what you want to hear. Cutting a cast aluminum case up and welding plate over a huge gaping hole and hoping it doesn't weaken the case sounds like tickling the back of your throat by going up your ***. Can it be done? yes. Has it been done? yes. Can you do it? maybe. will it cost a whole crapload of money? most likely. When you are done you will have some oddball monstrosity that will force you to build your car to suit it and you will always wonder if it's strong enough if you are lucky, you WILL know it's weaker if you are unlucky.

[Nismochick240]

mmmm... i agress go w/ the rb25 transmission easier to do it that way!

[Phat_Optimo]

Anyone have some insight on converting the 26 awd transmission to rwd?

E

The awd trans is locked in rwd constatntly (always). The only time the fwd is used is when the attesa computer sends a signal to the hydraulic actuator which inturn moves the gears inside the transfer case (basicly engauges the front wheel drive). So If you block off the front diff hole and plug the hydraulic input then techniclly you have disabled the fwd. Getting the trans to fit in the tunnel is a differnet story. It will fit though... check out my pics in my sig.

[driftjunke]

Well we're gonna do it, to be different, and hell I don't feel like finding a 25 transmission, and I hear they pull premiums 3 weeks before Race Wars. We will post pics of all the work. If the TC is hydraulically engaged removing it should be too bad, then we can just tig a plate over the cut off area, or keep it and notch the floorboard. It's a R33 RB26 so IIRC it's a 6 spd, right?

We'll keep everyone posted.

E

[Phat_Optimo]

The 6 speed getrags are only in the R34's. I would notch the floor board...

[CursedGTR]

The R33 GTR mission and the R33 RB25DET mission are the exact same thing internally, 5 speed and as I have been told by Holinger and PPG the same gear ratio even.

I would not go and chop your floor board I would cut the transfer case. That mod is done by quite a few tuning shops here that run RB26DETT powered GTS-T's. I only question the feasibility when it comes time to mount it. The RB25 drive shaft that Mckinney or anyone else puts out will not work The GTR shaft will not work either, so you have to go and get a custom shaft made, Then you have the mounting issues that may arise (I would not know for sure I have not dealt with the mounting kits in the U.S.). I would say that you are going to spend the same amount of money to keep the 26 transmission that you are to just buy a 25 transmission. So, if you use the 26 transmission I would just make sure that your welder knows what he is doing and you get a reputable shop to make you a driveshaft.

[Phat_Optimo]

It would be nice to hear from people have done it personally... So I would listen to them more than someone whos has not done it. So um alot of these posts make me laugh. But you can always follow the crowd. I OTOH tend not to.

[StricNyne]

Hey, a lil off topic, but i noticed u had a r32 rb26 , and in your photos, you showed how u fixxed crank coller issue with oil pump, can u send me some details on how you did it, or even where you sent it to, thnx, i am on aim at stricnynel0s or on yahoo at the same name, i am in iraq so sometimes i only got email at this address [email protected]

[driftjunke]

We got the transmission apart today, and pulled off the transfer case, removed the gear and chain that sends power to the front diff, took about 2 hours to get it done. We're welding a plate up for it tommorrow to make it work. I will post some pics for everyone, seems to be a great alternative to using the 25 transmission so far. I will keep everyone posted. Other news upon closer inspection of the stock turbos, turns out they aren't stock, we got some nice HKS 2530's.

It's gonna be fun.

E

[240convert]

2530's? you fricken MOFO!!! i'm so jelous...those are like 2 grand used!!! errr

nice find...

keep us updated on the transmission fix...

[Scott Buwalda]

Yes, PLEASE keep us updated on the use of the RB26 box. I have an RB30 box right now, but know for a fact the 26 box will hold more power. Photo documentation would be clutch (excuse the pun).

Scott

[driftjunke]

Well we cut the transfer case up and welded the plate to the transmission, here are a couple of pics.

Welding to cast aluminum sucks, too much contamination in the cast, but it should hold. We used some aluminum diamond plate to patch the transmission with, if it's good for skid plates on trucks it'll do for a transmission.

E

[driftjunke]

Another

[driftjunke]

more..

[driftjunke]

Here's the last one, the 26 is going in the car tommorrow, I will post some more pics and let everyone see the fit of it. Hopefully all goes well.

E

[Wulfgang]

Welding to cast aluminum sucks, too much contamination in the cast, but it should hold.

That's probably why that one that was up on ebay (from Japan) had a brazed plate. If the cast really sucks that bad, brazing might hold up better than a contaminated weld (and of course it will look better).

[StricNyne]

i was told you gotta modify floor of car to use rb26 transmission, can u show some pics of that once u bolt trany up thnx

[BoostFab]

you suppose to grind off the aluminum outer coating and clean it with acetone before welding. i have welded some cast aluminum oil pans and transmission this way wo issue.

you can also jbweld it

[driftjunke]

We were gonna braze it, but we just used a aluminum spool gun to weld it. We grinded it and cleaned it before welding, it just really popped alot.

We ran out of JB weld when we were doing the oil pan so we had to weld

E

[driftjunke]

It's in, I will postpics tommorrow, tight fit, but it works, shifter sits nice. Pics later, I'm going to bed.

E

[klh6686]

do you have to do anything different as far as the mounts are concerned vs a rb25 transmission or does it use the same mount you would for a rb25 transmission? Thanks

[CursedGTR]

Yeah how did the mounting situation work out for you?

Whats up with the drive shaft situation?

I think it is looking good so far. Like I said before I am not a big proponent of the swap if you have to pay a butt load of money for everything to be done but it seems you are doing this pretty cost effectively, Kick A$$ man.

Would you hook us up with some pics after it is in??

[Sumsr20det]

any update on this?

[Phat_Optimo]

I used the stock trans mount (rubber part). Bolted it to a 3/8" x6" piece of flat steel. Then bolted it up into the car. The 26 trans bracket does not bolt-on the S13-s14. I had a special driveshaft made. Cost about 250. Fits good and its very short under 40".