Mireck 12A

I've got two gearboxes, One should be from a GSL-SE.
What is the easiest way to tell the difference. Without mounting them yet offcourse
Is it true that the trannie of a GSL-SE has "longer" shifts for more topspeed?
And are all the shift's longer? or just the Fifth gear?

Greetings from the Dutch 12A Devil

P.s. No I'm not Jos

MosesX605

The GSL-SE transmission has a taller 5th gear, but otherwise similar gearing for the other four gears. I believe that the SE tranny is internally stronger than the 12A tranny due to the greater power of the 13B. As for telling the difference, there is one wire on the 12A tranny for the reverse light, and more than one on the 13B for some sort of sensor IIRC.

Matt
1979 SA22C

gamble302

ok the 12a tranny and se trannies are the same srength wise. other than the taller 5th in the se like he already mentioned you can see a vent on the se tranny that the 12a trannys dont have. its right at the back of what would be the bellhousing and was like 6 inches or so long, dunno though cause im not at home or even in the same state as my stuff.

gamble

Mireck 12A

Hmmm it looks like I've got 2 gsl-se trannies
Both have got a 2 wire backuplightsensor and a vent tube.

Bummer I was looking for longer shifts to deal with the torque of my Elford Turbo RX-7.
It looks like I was already driving with a GSL-SE transmission.

When I 'll get back from work I will take some pics and poste them here...

thanx anyway...

Mireck 12A

Erhhh I've taken some pic of the trannies... and I can't find much difference.... only circled parts... left is the "normal 12 A trannie" on the right the GSL-SE trannie.

The backup light sensor is alway a double wire in Europe according to the manuals...

So does anybody know how to tell the difference ?

Mireck 12A

another pic, taken from the other side... anyway to tell the difference ?

bliffle

I just put an SE 13b transmission in my 83 12a and it's great.

Why not just put it in gear, turn the input shaft and figure the gear ratios? I've always heard they are the same transmission.

b

Mireck 12A

Well.... that would be an idea...
but my "old" trannie is brand new.... don't want it switched for an same trannie but with more milage and the smae shifts...

It's for my Elford turbo.... run's fine... but tops out at 240 KM/h...
max revs at 8K
Don't want to drive more rev's in Fifht
Shifts are to short...
I've heard the GSL_SE trannie is more robust and has longer shifts...

thanks anyway...

Mireck 12A

Nobody?

Re-Speed.com

iTrader: (3)

Not sure what those came from. The 83 - 85 gearboxes had the shifter sep. from the tailshaft and it was further back. Those look like 79- 82. Not sure though.

Miata six speed is what you need. Here is a link for you on part interchange between miatas and rx7.

http://members.aol.com/solomiata/Drivetrain.html

-billy

bliffle

I was just blasting down the back roads in my 83GS, which has an SE transmission, and it winds up to 100mph in 4th, then cruises nicely in 5th with a 25% drop in revs. Very nice.

B

Mireck 12A

Bill,

Thanx for your help, but it seems that you are talking about the same gearbox as from a 13B FC or not? I've got a "spare" FC and there the shifter is indeed seperated from the tailshaft.

I always understood that the difference between the gearbox of GSL-SE is the lenght of the trannie and that you need also the GSL-SE driveshaft.

I'm not trying to cahnge the car to be the fastest 12A in the world , So I want to gets things the best they can, without using "foriegn" parts. Also my car is an European model, maybe that's the difference? We've got different GSL-SE/12A and models/parts?
I've got no clue..

P.S.
thanx for the link.... It was very usefull for sorting out the shift specs.... Now I know for sure that the shifts of a 13B GSL-SE are "longer"

Directfreak

iTrader: (2)

Can you post two complete (showing the whole tranny) pictures of these transmissions? One from each side, and I will tell you if they are SE trannies or not.

Based on what I can tell from the picture above, they are NOT GSL-SE trannies.

This is a GSL-SE Transmission on the Left, Turbo II on the right.

nimrodTT

So what is the identifying factor DF?

Directfreak

iTrader: (2)

Gamble already said it.

nimrodTT

Got a pic of this vent?

Directfreak

iTrader: (2)

Nope..

rotary emotions

Mireck, we normaly do not have GSL-SE's. If you have seen any real ones (not just a badge) it is imported from the US. I know a few of those. Also there are no 79-83, but 79-80 trannies (shifter moved further back after that year) If you want longer gearing you might want to think about endgearings. What axle are you running? Still 79-80? I've seen your car in Lahr, but don't know exact specs. Normally a 81-up tranny wouldn't fit the early SA, because the shifter was moved back later on. Are you having a modified dash? 81-83 or 84-85 dash?

Mireck 12A

Thanx DirectFreak!

These pics are a great help....
The difference is obvious...

But now I've got an other question...
Is the shifter located at the same place as on a 12A trannie?
In other words.. can I put the GSL-SE trannie on my car if I also install the GSL-SE driveshaft?

Rotary Emotions, Hi

Yeah I remember you car also.

I stil have the 79-80 axle but the diff pinion is replaced with the smallest gearwheel there is. So my diff. ratio can not be made smaller.But still get nuts from shifting thru my gears...

I've got the original 79-80 dash... is also still the nicest...
Rev's in the middle
Modified... erhhh.. well on top of the middle of the dash I've mounted my extra gauges for oil temp of the trannie and motor, turbo boost, water temp, current, oil pressure...
I call it modified yeah...

680RWHP12A

actually the SE trannys have 2 vents!!!

one vent is located next to the starter attached by 2 10 mm bolts to the bellhousing and the other vent is on the oppisite side of the bellhousing and is cast into the bellhousing...


those weird other trannys look like 79 trannys judging by the shifter position

680RWHP12A

great pic ,,,,, you cut off the tranny right next to the vents!!!LOL p/s those are clean trannys!!! you could eat off of those!!!

680RWHP12A

GAMBLE,
you are right on!!!the only internal difference is 5th gear

Mireck 12A

Erhhh still confused....
We are talking about the First Gen type SA22C and FB?

Because these 2 trannies look like a FC turbo II trannie and a normal FC trannie (I've got a FC aswell)

I'm really confused now...
I've driven once a imported GSL-SE '85 and the shiftstick was in the same place as my other car ('85 12A)

HELLLLLLLLLPPPPPPPPPPP !!!!!!!!!!!

I'm dreaming trannie's !!!

Mireck 12A

Thanks for all the help guys!!!

I visited the guys at www.euro-rotor.nl and took a look at all the different type's of trannies.

Now I understand what trannie belongs to wath type of RX

Thanks for all your help and input,

I'll put a 12A '85 trannie or a 13B trannie into my SA.

branca

iTrader: (1)

it's an 84 or 85 with two sets of wires (one on each side), and one circular vent on the bottom, is it a 12A or an SE tranny......?