its only a 3.96 and a 4.11 difference. and on some years of rx-7 there both 4.11.

 

Why hasnt anyone suggested a high performance torque converter?

 

Because it would still suck... The auto tranny on FC is terrable. Giving it a higher stall converter may help out slightly, then getting s shift kit for the tranny, but even then you arent even up to a stock 5-speed level. They have a 3.909 rear end (not 3.96) as opposed to the 5-speed which came with a 4.10 rear end(not 4.11).

Theres nothing wrong with some auto transmissions in some cars, but the rx-7 isnt one of them.

 

Exactly.

Mazda didnt plan the auto tranny into the RX-7. They added the option to sell cars to girls or people who want the luxury, not the performance. Now some cars have really good auto trannies, but the RX-7 one was just used to sell cars.

 

I completely agree. Having Rx with an Auto is like putting a govenor on your car.

But like I said, its not as easy as everyone says to just swap. You have different electrical connections between the two tranny types.

 

https://www.rx7club.com/forum/showth...hreadid=201102

Do it.

 

only on the 90-91 'vert. All the auto tranny coupes had 3.9 rear ends.

And I must agree with the other comments, the auto tranny makes the FC a dog.

The shift points are way too slow and 1st gearing with the 3.9 rear end makes the auto tranny even slow off the line. In addition the extra 60 lbs, adds evern more to slower nature of the auto tranny FC.

 

black 13b, unless youve done the swap stop actin like its as simple as changing your intake manifold, it just plain isnt!and a different electrical connector isnt a big deal, grab the manual tranny, and leave all the connectors pluged in and just cut the wires, then splice and wrape.

 

Yeah right.

Unless you have the exact wiring diagrams, BOTH, (90 n/a Auto and Manual) and have all wires explicitly color coded exactly you're going to have trouble. Especially if you're a newb....

Look, lets not pretend that everyone here knows jack **** about Rx7's. Everyone here knows something, but we all, in a sense know nothing.

Trigger has a 90 N/A

Are you going to tell me that all of the sudden he can know what r/b b/w to the B/w to the R/whatever-the-**** is just gonna work as long as you "splice" it.......You're dreaming.

Reality check!

 

Honestly, out of all those which do you think they will be doing? Lighten the car maybe.

 

I read the writeup I just posted a link to, and it didn't seem that difficult.

Even if it was the hardest thing ever, who cares, just don't be lazy. Go do it. You won't regret it.

 

Whoops, I thought you said it was easy.

LOL!

 

I had written a response to Mephis about why the automatic is such a dog. Then I tried to edit it and the forum went down on me. So rather than rewrite the statement I just wrote "Whoops I thought you said it was faster".

Anyways - The hardest part of the ordeal is probably making / having someone make the mount brackets. Anyone read that writeup yet?

It's not that tough. Getting wiring diagrams is easy too.. More than a handful of forum members have websites with the full FSMs on hand.

 

Wait a minute. I just noticed the link I posted no longer has the pictures of the tranny mounted up.

I'll go and find that one.

------------------

OK, This one has the pictures with it showing both ways you could mount the tranny.

https://www.rx7club.com/forum/showth...t&pagenumber=1

 

First let me say that thinking about it is one thing, doing it is another.

Yes its hard and its worth it. But if Trigger isn't mechanically inclined, then it could turn out to be a disaster.

Replacing the Cluth and Brake peddle assemblies. The're no room for you to stick your head in and start cranking on the bolts. You basically have to play Twister, And once you do get it out the Auto peddle assembly, then you have to get the Manual back in.

S-U-C-K-S

The differential, That's really really fun too with crusted grease getting in your eyeballs.

Not to mention that you bassically have to craft your own transmission brackets.

And as for the wiring explanation in the writeup. Well, Like I said I figured it out with a lot of trouble and I have no idea what this means:


Step 5: Reverse Lights and Neutral Safety Switch
Locate the two red wires on the manual transmission, keep them in mind.
Look for a white three pronged clip that used to plug into the automatic transmission, cut all three wires and connect the bottom two together "this will allow you to start the vehicle" and connect the top of the three to one of the red wires on the manual transmission "doesnt matter which one, you will need to add some wire to complete the connection".
Now take the other red wire and run it into the inside of the vehicle through the shifter hole " you will need to add soem wire to complete the connection" locate the wiring harness in the shifter area that used to connect to the automatic shifter assembly.
Locate the 4 pin clip, now locate the black with yellow stripe wire and attach it to the wire you ran inside the car from the transmission "this will allow your revers lights to work".


Stick the red one in..

and stick the red one out.

Do the hokey pokey and turn youself around,

And that's what it's all about!

 

That was the easiest thing for me. I'll go take a picture of mine for you right now.

 

So you're gonna let all that stop you? It's been done, more than once, successfully.

Pictures of your brackets? So you've done it then!

It's not a job for anyone who is afarid to get their hands dirty.

 

Black,

How do you post pictures?

 

Click "post reply"

Click "Browse" next to "Attach File" underneath reply box.

If you do not see the browse button, your browser doesn't support uploading.

 

and..crap the file's too big...have to resize it photoshop....But gotta go.

Late

 

wow that write up is terrible especially with the tranny mount....go to rotaryresurrection.com.....kevin has a much better writeup......u dont need to run the wiring up to the shifter and find all the crap just run it into the fuse box...all it needs is a power source....plus u need to run a wire off the starter up inside the dash to the ignition otherwise your car wont start becuz of the neutral and park lockouts.....
plus on swaping out the rear end.....takes all of 20 minutes.........u drop the two bolts on the diff, disconnect the struts and calipers, unbolt the subframe from the body and if u didnt have it all jacked up it will just drop to the floor.......then u can unbolt the diff and bolt the new one up easily....becuz anyone whose tried to unbolt the front of the diff knows thats the hardest thing to do in the world when its still in the car

but all in all.......the swap isnt that hard....im not that super mechanically inclined but i did the whole thing in 2 1/2 days by myself except when my friend gave me a hand with the heavy stuff like installing the tranny and putting the rear end back up etc.

 

level 10 in NJ will buiold you a very solid tranny.. but to get your monies worth out of a $3400 usd build up.. you'll need an upgraded TII motor under the hood at least..

failing that, at least get a high stall TC and change to B&M trickshift ATF.

 

ok upgrade teh torque converter and see if you can get a shop to redo the valves. Theres a big well known shop in new jersey that works on automatics a friend has one in hi is 300 the thing launces and shifts as ahrd and fast as a stick. HI is 300 was in super street blk one form ny if you have that issue the tranny shop is prolly listed there

 

lol just saw ppc's post thats the name level 10
tehy do awesome work

 

Critic, not me! Oh by the way your use of the word 'their' is incorrect in your thread title. It should be 'there'...