mazdaspeed

Looking at a 88 RX7 with a T2 angine/tranny swap. Apparently the T2 drive shaft is smaller than the N/A drive shaft. So the drive shaft was shortend to fit, but unfortunatly it was shortened to much, causing a vibration. So it needs to be extended slightly.

1)Is it possible to extend the drive shaft slightly what would it cost?(Ballpark)

2)Would it be better to get a new drive shaft and re shorten it properly?

3)If i could find a T2 drive shaft would it bolt dirrectly in?

Thanks for any help, much appreciated!

Digi7ech

iTrader: (1)

I'm not totally sure what you mean. Do you mean a NA rearend and TII engine and tranny?

I am going to buy Mazdatrix's hybrid dive shaft since it is bolt on.

Drive shafts can be lengthened but you have make sure it's still balanced.

SonicRaT

iTrader: (6)

It's probably an automatic driveshaft, since the yolk fits and it bolts up to an N/A rear-end, but is a few inches shorter than it should be. Just get a TII rear-end, or swap a tII flange onto the N/A rear and use a a tII driveshaft.

mazdaspeed

Yaa thats what i mean, the N/A drive shaft was modded to fit but it was made to small, so I have to either, lengthen it or buy another and mod it correctly.


I called a driveline shop and they said it can be done but its hard to do with out a slight vibration at higher speeds (above 100 KM/H) and it was basically a gamble


What drive shaft are you talking about? Link?

mazdaspeed

That is a very good solution!!

If i can find a T2 flange/TII drive shaft.

Thanks

mazdaspeed

It will bold right from the TII tranny to the N/A rearend?
BTW thanks for all the help!

SonicRaT

iTrader: (6)

Yes, it will. http://www.mazdatrix.com

mazdaspeed

Thanks
http://www.mazdatrix.com/getprice.asp?partnum=2691-000

that should be the one $277.68

Any idea where i could find a TII rear end flange?

Digi7ech

iTrader: (1)

I thought the joints or something weren't replaceable? wouldn't that flange swap mes with those?

That's another reason why I'm getting the mazdatrix one. It is the after market shaft with replaceable joints.

marcus219

The U joints are not replaceable..... but the flange is on the differential, and it bolts the diff to the U joint.....this is my plan. Although I dont see the flange on mazdatrix's website, probably have to get it from dealer, anybody know how much?

marcus219

annnyyyone?

scathcart

Yea they are. I have done it.

IDIGATIT

I recently just did a full t2 drivetrain swap the drive shaft doesnt bol up you have to bore it out 2 fit the diff
other than that everything from t2 flywheel to t2 rear end is good

85TIIDEVIL

iTrader: (2)

I just did the swap tooo... and I used the N/A transmission and driveshaft along with the TII rear.

The flanges on the rearend weren't the same. I tried to swap them out, meaning put the n/a flange on the TII rear so I could use the n/a driveshaft, but the flanges were different. Although the n/a rear flange was S5/90 and the TII rearend was S4/87. Maybe that's why they wouldn't swap.

I still got the n/a driveshaft to work on the 87TII rearend/flange, without any vibrations and I took it up to about 120mph last night.

I had to center the driveshaft on the rearend flange using the raised ring, (you'll see exactly what I'm talking about if you do it) and drill out new holes in the TII rearend flange to match the driveshaft's rear flange. Then the n/a driveshaft flange is smaller in diameter/overall size vs the TII rearend flange so the back of the TII rearend flange had to be grinded to accomodate the bolts to sit flush, (again you'll se exactly what I'm talking about if you do it). It wasn't hard at all.

Evil Aviator

The S4 and S5 dimensions are the same. The TII and NA parts simply don't swap.

This will work, but it's not usually such a great idea because:
1) Most people are not capable of performing this labor well enough to avoid vibrations.
2) In the end, you still have the nasty old stock driveshaft that is probably about to bind up in its old age.

Better idea:
The Mazdatrix custom driveshaft is a better idea because it fits, it will last a very long time, and it isn't much more expensive than a stock driveshaft.

Best idea:
Buy a NEW TII driveshaft and a good used TII rear subassembly (or TII differential and halfshafts). There isn't much point to adding the heavier TII transmission while still using the weak NA driveshaft, differential, and halfshafts.

mazdaspeed

Thanks for all the input!

85TIIDEVIL

iTrader: (2)

The raised ring in the center of the driveshaft flange centers the driveshaft to the rearend without ANY play. It's a no-miss, no-brainer.

But it saved me a hundred - twohundred $$$$$. Which can EASILY be swapped out should it ever fail.