Did a search, and couldn't believe nothing on this came up for "TII 3rd Member".

Anyway, I'm looking to put a S5 TII 3rd member into my S5 Vert. I know I need a Automatic driveaxle to put a TII Tranny into a NA. But, I'm just putting a 3rd member in for now. I know I need the TII half shafts, go I grabbed them too and good there.

My question is, can I put in the S5 TII 3rd member into my S5 Vert and still use the NA drive axle? Asked another way, is the length the same and will the mounting holes on the flange line up?

 

Im not sure what you mean by "3rd member". Also I have never heard of an automatic driveshaft working in a T2 transmission. That would be cool if it did.

 

3rd member=rear differential unit

Also, I'm hearing that using a Auto tranny driveaxle to mate up a TII tranny to a NA 3rd member isn't as confirmed a solution as I was led to believe. So, check with Mazdatrix or the like before you try that program.

Also, to share advise I just got from IceMark:

"actually you would only use the Auto drive shaft if you using an auto tranny. yes the input and ouput flanges fit perfect, but the drive shaft itself is about an inch too short.

If you have an NA manual tranny, and you are just swaping in the T2 rear end, then I would just re-drill the rear drive shaft mounts to match up to the NA drive shaft.

see the NA manual and T2 Manual trannys are different lengths and the auto tranny is again a different length than either of those two"

 

Time to clear some things up with comparisons.

-The NA rearend is narrow, and thus has wider axles. The t2 rear is a bit wider, and thus has somewhat shorter axles. The difference in width does not change how the diff mounts to the car. The difference in width is enough that you cannot use a t2 axle on an NA rear, or vice versa.

-The NA diff has a smaller flange on the front. The t2 diff has a larger flange. This means the bolt pattern on the flanges are different, as well as teh size of the driveshaft flange itself. **Because of this, you cant use an NA (automatic) driveshaft on a t2 rearend.**

-The NA driveshaft has a small rear flange and bolt pattern that only fits NA rears. The t2 has a larger one that only fits t2 rears. You could make it fit an NA diff if you wanted, by re-drilling the rear flange. This means, if you wanted, you could run an NA diff and axles in your t2.

-The NA driveshaft for a 5sp is the same length as a t2 driveshaft(within about 1 inch). The automatic NA ds is shorter than both of them, by about 2.5". You can use an automatic DS with a NA rearend, and a t2 trann7, but it depends on how comfortable you are with the front yoke hanging out an extra couple of inches from the tranny. You still have about an inch of yoke inserted into the tranny.

-The NA 5sp DS has a small yoke on front that only fits the NA 5sp. The auto NA and t2 DS's have a larger front yoke that fits only t2 and AT trannies. **Because of this, you couldnt hope to use an AT ds with an NA 5sp tranny.**

There you have it. As it is, you have a few options, all custom.

1) have a DS shop remove a rear flange from a t2 DS, and mate it to your stock NA 5sp shaft with a new ujoint.

2) have a DS shop cut in half an NA 5sp DS and a t2 DS and weld the two together, similar to that above, except on the shaft instead of at the joint itself.

3) try and re-drill the t2 rearend flange to fit an NA DS bolt pattern.

4) see if it is possible (I truly dont know) to swap flanges on t2 and NA rear diffs, and put the NA flange on the t2 rear, though I doubt this will be possible.

Bottom line, do it all the first time, the right way, and avoid rigging.

 

a little further on the length thing...

Overall length of the T2 drive shaft is 38.03 inches, while the NA drive shaft overall length is 38.07" (so that is pretty close; only about 1mm difference), but the diff connection mount holes and main shaft input are not the same.

Overall length of the NA auto drive shaft is 35.94", and while the auto drive shaft has the same main shaft connection as the T2 manual tranny, and has the correct rear to mount to a NA rear end, the shaft is radically short.

So you will need to either drill the T2 3rd member/diffs input to match to a NA drive shaft, or build a custom drive shaft

 

GREAT STUFF!! I think this is worth a 5 star rating.

Also, this confirms that I'm going to wait until I can get my hands on a good TII Tranny to make this installation stock correct.

FYI, I pulled the entire rear sub-frame to help insure correct installation.

 

one more word of advice: Just call it a rear-end/diff. I've never heard of it being called a 3rd member, and I'm sure most other people are the same way.

 

You already know this, but.....Just call Mazdatrix and they will make you a Turboii To N/A driveshaft for some dough. They don't even quibble with you, so they must do it all the time. Ordered one myself last Friday.

 

How much???

 

Yeah,

How much dough did yours cost, if I may ask?

 

Yeah,

How much dough did yours cost, if I may ask?

 

3rd member referrs to the center section only, that part houses the ring and pinion and differential. The part he was talking about swapping is the entire rear axle.

 

For real, i wonder how much?

 

on of the guys here has done it from what I understand and it worked fairly well..

his N/A rear gave out before anything else did

and it did last up against 5000rpms clutch dumps and a 13 second pass

only problme I heard him say with the auto driveshaft is for one you do lea a little tranny fluid.
two you still have the N/A rear end

 

Did I hear some one say *How Much*? Like the man said, if you have to ask the price, you can't afford one.

It was two hundred forty something.

Please, I don't wanna hear how I could have gone to the local drive shop and have one made for less than a hundred bucks.

I've been waffleling about wherther to put the spare Turbo engine in the n/a for a little over a year now. I just woke up one day and called Mazdatrix and ordered six hundred bucks worth of parts to force myself to do it.

I hate messing with something that I spent a good deal of time to work right. That car was a lemon of the assy line, and now it isn't.

And now I'm left with the Mazdatrix header and full dual exaust system. What am I to do with those? Problems, problems, problems.

 

sell the fuell dual exhasut... iknow someone who will buy
PM pd_day

 

Sometimes I feel like I'm keeping them in business by myself. Nice to have a little help.

Rob

 

Rob500......well, when I had ordered my parts the guy got to chit chatting a bit and mentioned he was thinking about buying a new boat, and in the same breath asked me how my last physical at the doctors went and how much longer I was going to be working at my present job.

I think I'm starting to put two and two together.