mazdaspeed7

This is a pic of the driveshaft I got from hypntyz7 sent me(top) sitting next to the stock driveshaft out of my car. Notice the difference in the diameter of the shaft. The shaft is the same diameter as the TII shaft, but it has the n/a yokes on it. How is this possible?

Samps

I think I have the thicker one with the lil cooling fins on the end.

HAILERS

Its from a automatic. You can put a turbo transmission in the car, and use a N/A automatic transmission driveshaft so you don't have to change the differential. Make sense???? Anyway, *I'd bet its from a n/a automatic transmission car.

Samps

According to the way I read; Which is left to right top to bottom. Mazdaspeed is saying that the skinny one came out of his car, which is a manual (i hope). This would all make sense if the top one was his and the other guy sent him an auto shaft. I'm confused; HAILERS, fix this.

tmak26b

its from an auto

hmm i didnt know you can use a T2 tranny just by using a NA rear end

peejay

Auto shafts are a different length, and have a regular N/A flange on the rear, and a T2-sized slip spline on the front.

I'd want to guess that the beefy shaft is an aftermarket unit, but I've never seen an aftermarket front yoke with the oil slinger on it... usually only the OEM shafts have ****-retentive details like that

edit: found the link... gr00vy pix at http://www.16paws.com/rx7/index.html

HAILERS

Yeah I can do better. The top one he bought. The bottom one is his out of a N/A. It has become sorta common knowledge around here lately, that a N/A with a automatic transmission, has a driveshaft the same size as a turbo manual model, and that the front end of this automatic driveshaft will fit into a tubo transmission. The real good thing is that the rear end of the n/a, automatic driveshaft, has the same bolt pattern as any other n/a car. The TURBO driveshaft looks similar to the one in the picture, except the bolt pattern on the rear end IS NOT the same as the bolt pattern in a N/A. Now I do admit that I've never seen this myself. Its just what I've gathered from reading on this forum. I'm going to put my spare turbo engine in my n/a, and thats why I have some hint of what is going on, at least in my mind. Gonna put a turbo engine and transmission in a n/a and use a automatic driveshaft to couple the two. I understand the auto driveshaft is a touch shorter but will work. Make more sense??????

mazdaspeed7

the driveshaft will work right though, right? I have it in my car already, but havent driven it yet.

Stepdaddy

you better hope so

Felix Wankel

It does. My brothers 87 had a thick one, and the one I took out of my GXL parts car to replace it was a skinny one. It works fine. I suppose its just some more of Mazdas bullshit.

mazdaspeed7

Alright, first let me add that it works GREAT. My car rides absolutely perfect now. Not the slightest vibration at any speed.

Heres a question: It was said that the TII and auto trannies use the same output splines. You could use the auto driveshaft to mate a TII driveshaft to a n/a diff. Wouldnt that then mean that you could use a regular n/a driveshaft with a TII tranny too?

Xentrix

Yeah, hypntyz7 knows his stuff.

Felix Wankel

No.

mazdaspeed7

Heres the failed u-joint from my bad driveshaft

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