todius

Does the GTU model uses a turbo tranny or does it have an NA tranny. I've read that the tranny was beefed up as well as the suspension in the GTU model.

Dak

It has the same tranny as any other n/a from it's respective year group.Your thinking of the GTUs which also has the n/a gearbox but with a close ratio 5th gear.TII's were the only cars released with the turbo gearbox.

Turblown

iTrader: (12)

I've heard a lot about this. But then again my 88 GTU came stock with the TII Tranny. I've heard both sides. But then again the 88 GTU is basically the same as the GTUs. its even got the 4.33 in the rear

peejay

Node

iTrader: (1)

Uhm, no
Turbo II's were the only cars in US w/ Turbo tranny
And GTUs and Inifini were only FCs to ever come stock w/ 4.3 rear end
only other gears offered where 3.9 (auto, and some say certain verts) and 4.1 which was standard on every manual besides GTUs and if the vert thing is true

Icemark

Nope, no way, no how, didn't happen.

I'd even go so far as say someone perhaps is using illegal substances.

If that is the case did your GTU also come with a T2 starter??? Perhaps a T2 clutch???

Perhaps the T2 drive shaft as well, since the R type tranny is longer.

If those parts are on your car someone whole owned it before you put those parts on it. They would require a new clutch/ flywheel/ counterweight and a trip to the wrecking yard.

Turblown

iTrader: (12)

explain this then
READ THE WHOLE THING BOTH PAGES

My car was stock when i bought it from a collector, it has the whole drivtrain... I;m not too sure about the 4.33, i was just told that.

Mark S

iTrader: (1)

I've looked in the Matras book as well as asked Mazdatrix in the past.

88-GTU 4.1 Posi, NA Trans

89-90 GTUs 4.3 posi, NA trans (closer ratio fifth gear)

The only place the 4.3 is avalable is the GTUs (or the Jap enfini turbo)

You can get the ring and pinion for the 4.3 from RP or Mazdatrix, etc. and install it yourself, but they did not come stock.

Turblown

iTrader: (12)

How could u tell if u had it in the rear? maybe its a mistake but i know for a fact i got it stock THE TII drivetrain

MaxRX7

yeah there is NO way your car came with a turbo tranny.

SpeedRacer

You are WRONG, and Vosko is WRONG. Just cause you linked us to another board, that says something, different, how does that prove you are right? You do NOT have 4.3 gears, unless somebody put them in aftermarket, and you do NOT have a T2 tranny and driveline. Lets see pics of your T2 driveline if you are so sure. The bellhousing is a little different. Your rear-end IS LSD, but its not 4.3.

Icemark

Real easy way to see if you really do have a T2 tranny on the car, climb under the car and measure the drive shaft.

The T2 drive shaft is (from knuckle axis to knuckle axis) 30.47 inchs
The NA drive shaft is 30.78 inches.
So the NA drive shaft is a little more than 1/4 inch longer.

The T2 drive shaft is 2.94 inches in diameter
The NA drive shaft is 2.24 inches in diameter.
So the NA drive shaft is almost 3/4 inch smaller.

But even if you do have a T2 tranny in there it didn't come that way from Japan. I personally think that the guy you bought it from was blowing smoke up your rear end, but that's just my opinion. measuring the drive shaft will tell you for sure.

go_speed_go

To check for if you're rear is a 4.10 or 4.30:
Jack both rear wheels off the ground. With a piece of tape, or shoe polish, or whatever you got, put a mark on the flange that connects to the driveshaft. Next move the mark to the 12 o'clock position. Then spin one of the wheels one full time around. If the unit is a 4.10, then the flange would have spun 4.1 times around leaving your mark a little past the 1 o'clock position. If it's a 4.30, your mark should be closer to the 3 o'clock position.


As for the TII tranny in anything other than a TII, it never happened. For starters, I parted out a '90 GTUs. It's tranny, and only the tranny, bolted into my '90 vert using the existing 'vert clutch and drivershaft. Secondly, a TII tranny MUST use a TII clutch as it's different from the NA clutch. Go to the websites for Mazdatrix, Racing Beat, and Rotary Performance. They all list clutches as NA or Turbo, not 'NA except for....".

thomasmeisch

this seems to be a touchy subject. No body seems to be mentioning the UK rx7's they came in different varients then jap or us.

My vert I bought new in '89 has turbo underpinnings, Mazda Says Its because the verts heavier frame required the beef up.

I'm reading my '89 owners manual now page 8-2 says
4.300 gears - '89 GTUS grade models. (note GTUS 5th gear is 0.756)
but 1-4 are same as N/A gears

4.100 gears - N/A's
1st 3.475, 2nd 2.002, 3rd 1.366, 4th 1.000, 5th 0.697.


4.100 gears - turbo, verts
1st 3.483, 2nd 2.015, 3rd 1.391, 4th 1.000, 5th 0.0719.

3.909 gears - N/A automatics
1st 2.841, 2nd 1.541. 3rd 1.000, 4th 0.720

Buy the way I purchased mine in Vancuver, Canada

links below for mr info

thomasmeisch

stuff

Icemark

Another way to tell if you have a T2 tranny (which verts don't have BTW) is that the bell housing is bolt on for the T2 tranny.

But the NA tranny and bell housing are all one piece.

BTW thomasmeisch, the 'verts have the suspension off of a T2 as do the GTUs/Sports/88 GTU models, but not the mechanicals.

Icemark

Not too many RHD cars in the USA. I doubt that 1Revvin7 has one.

thomasmeisch

'89-91 verts all had TII trans. and suspension. I do not believe that my Mazda dealership is wrong, my owners manual is wrong nor my Mech. I purchased my RX in canada but manual is for all '89 RX's

ZachSpazz

You have a TII suspension but not a TII tranny...trust me on this. Mazda dealerships sometimes don't even know what kind of engines our cars have...you'd think they know the tranny?

peejay

Our parts books onlylisted two types of brakes and two types of suspension - basically four lug or five lug. All FCs (in US anyway) have the SAME springs except for Convertibles which have slightly stiffer springs in the rear. All suspension differences, in other words, between a base model and a T2 and a this and a that etc. are in the struts!

I seriously seriously doubt Mazda would bother putting the Turbo transmission behind an N/A. Especially in a convertible, as the convertibles were complete tanks that Mazda was trying to keep as light as possible - that's why there was to droptop turbo in the US, it weighed so much that the MPG would have been horrible - "no Mazda will ever again be called a gas guzzler".

Turbo trannies are easy to spot once looking underneath the car. A N/A trans will be one continuous piece from the engine to about midway along the length of the trans, and the case will be fairly smooth with no strengthening ribs on the side. A Turbo trans has a separate bellhousing that the transmission bolts to, and so you can only go a little ways from the engine back before you hit a seam. The transmission is also covered with strengthening ribs.

Or another way to check is to look under a mid-90's Ford F150 2wd 1/2 ton pickup with a 5-speed. If your transmission looks like the truck's, you have a T2 trans. (The same unit with different gears was used by Ford for many trucks and also some T-birds)

Turblown

iTrader: (12)

dead on, its 2 PIECE, ribbed everything,. i'll buy a ****** scanner tommorrow - and show everyone..... I'm going to test the rear end deal... good idea abou the amounts of spins...

And i will contact the last owner... lives close.. to ask about anything. She gave me all the service records everything, she was midle aged too. I highly doubt she was soupin up the car.....

Dak

Not to be rude but they did not.I have a friend with a '90 convertible who I helped the previous owner do an engine rebuild and alot of other mods to.The tranny had the smooth case, and the clutch and lightened flywheel we put in was also for a n/a.So even if some came with the TII tranny( which I strongly believe they did not) not all of them did.

Dak

Does it split at the bellhousing or back towards the middle.There is some confusion here.Neither one is two pieces actually.The n/a is three, the transmission case( which is smooth),the intermediate housing,and the extension housing.The TII is four,the bellhousing,the transmission case( wich is ribbed),the center housing, and the extension housing.If you can scan and post a picture that would settle whether or not it is a TII tranny.If it is, someone put it in there.It didn't come that way from the factory.

Turblown

iTrader: (12)

yeah we will, i already got the scanner tonight, taking pics tommorrow. I;ve been trying to settle this for awhile, becuz no can ever put ******* pics on the damn screen...... Everyone just says ribbed this and ribbed that or smooth here ya da ya yada., but hey eveyone thanks for all the info, lol..

Turblown

iTrader: (12)

u guys were right i don't have the TII tranny, but i'm going to put some pics up later, as soon as i develop the film, to show u why u was confused. I did a lot of research and found some pics.. but this is a very common Q, everyone i knoe with FC's think think that i do have it, oh well just more $$ and another item to get in future....
and i seriously doubt i have the 4.3 back there now too...