1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Auto trans to Manual trans swap

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Old 06-04-08, 09:33 AM
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You'll need the dust shields that go around the bellhousing on the 5 spd trans too. I think there is one on the passenger side and one on the top. Good thing you've got the 85 pedal box because the 83 bracket is different. Otherwise you'd have to take the 83 pedals and put them in the 85 box in place of the old wider brake pedal.

Make sure you get a pilot bearing and seal to go in the end of your eccentric shaft also. You should put those in with the new clutch. I don't believe that the auto cars have a pilot bearing or seal.
Old 06-04-08, 09:54 AM
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Good time to replace the rear main engine seal.

Also might want to consider replacing the front and rear seals on the transmission as preventive maintenance.
Old 06-04-08, 11:59 AM
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Sorry, quick question - I've been reading in and im actually wanting to get the same project underway on my '85 GS.

If someone were to go to a junkyard and find an 84-85 manual, where would they find the manual wiring harness in the car? One of the last things i need it seems, as well as that speedo cable, since i thought they were the same thing, the auto was just longer.


Should be able to have my conversion done this summer, more than likely before july.
Old 06-04-08, 12:02 PM
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The manual tranny wiring harness connects in the driver's side inner fender in the engine bay. I believe that it is a 5 pin plug? I think that two of your wires go to the actual transmission (for reverse lights) and the other 3 go to the starter if I'm not mistaken? Anyway, look in the driver's side inner fender and find the 5 wire harness that connects to the transmission. It's pretty easy to find once you get in there.
Old 06-04-08, 09:03 PM
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I used my auto tranny speedo cable into the 5 speed (84 GS, posted in the link on page 1). Also using the same cable on my T2 now.
Old 06-05-08, 10:34 AM
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Originally Posted by rx7doctor

Also might want to consider replacing the front and rear seals on the transmission as preventive maintenance.
Also, are these the input and output shaft seals?

Link to verify:
http://www.partsamerica.com/ProductD...rtNumber=13931
Old 06-05-08, 11:32 AM
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i would say that they are. easy to change once the trans is out and a great idea as preventative maitenance.
Old 06-05-08, 12:18 PM
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here are a few pics of the car. i havent even started to clean anything. the car is filthy. its been sitting for over a year. i plan on going through everything when i do this swap. no body rust. the only rust underneath is where the brake master cylinder had been leaking, causing the metal to be exposed and rusting. easy fix now as its only minor. the only other problem i have is that when the ignition is turned off and the key is removed, the radio stays on..thats weird, lol. i'm going ot have to pull it and check the wiring. i'll fix it all. the car has a rear wing. though i'm not a fan it l;ooks to have been there awhile and if i remember correctly, i've seen other's this same style. the wing is actually metal. it will be removed. only 113K.





Old 06-05-08, 12:39 PM
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i may be interested in your automatic stuffs
Old 06-05-08, 01:23 PM
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let me know. i'll make you a good deal on everything.
Old 06-05-08, 01:53 PM
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sounds good. Coming to the meet at my shop on the 29th?
Old 06-05-08, 03:07 PM
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i have to leave for national guard drill tomorrow until 6-22. so, i wont be doing much but wasting away as a recovery sgt in grayling michigan...
Old 06-05-08, 03:10 PM
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Car looks like a good base to start with. Yea that spoiler has to go though lol Doesn't really flow with the lines of the car. Keep us posted on your progess, and good luck with your drill....
Old 06-05-08, 03:24 PM
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the car is decently nice. a lot of original unmolested things on the car. being a GSL i really think its a worthwhile project. the body has poor paint and some hail damage. some dents are present but overall i'm pleased. the seats are shot and it needs a new rear carpet. the dash padding is bowing and the sunroof crank is beyond repair. the master cylinder is shot, the oil cooler is leaking (o-rings), and the water level sensor gasket is all but gone. but on the good side, the engine runs super well, the brakes and exhaust are new, as are the tires. so, the car really does have some good strong points.
Old 06-05-08, 03:41 PM
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Originally Posted by mazdaverx713b
i have to leave for national guard drill tomorrow until 6-22. so, i wont be doing much but wasting away as a recovery sgt in grayling michigan...
so youll be back with a week to spare!
Old 06-05-08, 06:33 PM
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if i'm not working i'll come out. i have to go to an AR-15 instructor course for the police dept when i get back in wadsworth on 6/24-6/26. if i'm off on the 29th i'll be there!
Old 06-21-08, 04:41 PM
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ok, i'm back from my two week military training stint in michigan. its great to be back. i should be starting this swap within a week. i will post pics of the car and of the swap.
Old 06-22-08, 12:03 PM
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Can't wait to see it.
Old 07-12-08, 01:11 PM
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Sorry to double post,

Can we get an update? I'm curious to see your work
Old 07-13-08, 09:00 AM
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Don't know if this is an issue, but I know that in many cars the rear end is different in an auto than in a manual. I basically replaced the body on an old Corolla for my mom years ago (bent frame from an accident and was easiest to find a clean body and put the engine, trans, and clutch from the wrecked car into it than try and fix the wrecked one) and didn't think about the rear end and it ended up that she was going faster than what the speedometer said because of the different gear ratio in the rear end that was for the auto trans.

If this is the case I doubt that you'll really see it as a problem, but just wanted to mention it since it is always nice to know how fast you're really going.
Old 07-17-08, 06:20 PM
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Originally Posted by Percentage
Sorry to double post,

Can we get an update? I'm curious to see your work
i hope to start working on the car by this weekend or the middle of next week. i've been so busy with other crap that this has gotten pushed aside a little. when i start i will definatly be posting pics of the entire process.
Old 07-20-08, 09:22 PM
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ok, the first phase has begun. get the car road ready and completely operational. complete. today, i bled the brakes completely with new valvoline synthetic fluid, made some carb adjustments and did a very good inspection of the braking system and suspension. i found that all of the brake pads need replacing and there are a couple of worn bushings. the muffler is bad, the beehive o-rings are leaking, the cooling system, though VERY strong should be flushed and replenished with clean cooland/distilled water. i gave the car a quick bath and took a vacuum to it as well as an interior wipe down. the car performed flawlessly on the road test. its a very plesent car to drive, though the auto trans, as nice and smooth as it is, really does take something away from the car. here are the pics:









more pics to follow. the swap should begin in two weeks. roughly the next weekend that i have off.
Old 07-20-08, 10:24 PM
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Is it just me, or do those tires look huge? What size are they?
Old 07-21-08, 08:42 AM
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they are too big. you are the first to notice!!! they are 185/80/13. they are WAY too tall. they will definatly be replaced!
Old 07-21-08, 10:32 PM
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Hahaha yeah I thought they filled out the wheel well a little too much LOL. That is a huge sidewall. I bet it makes the ride nice and comfy though


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