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subtleZ28 84 auto-manual swap
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15 Posts
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2009/1/4 1:22



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I'm in the middle of swapping an 84 vette from auto to T56 (it is an LS1 swap).
I have the dash and bracing all apart. I purchased a set of pedals on CF, and they don't look like they will work.

The aluminum box is different shape on the new-to-me manual brake pedal (on the rear facing end, the master cylinder side is the same), and the pedal itself has too much material above the bushing, so it cannot be swapped into my aluminum box(I wish I had the proper term for that).

Also I cannot see where the clutch pedal and bracket will go.

Are 84 firewalls different between autos and manuals?

Is the bracing different auto vs manual?

What year pedals will work w an 84?

I'll try to get picks up tomorrow if that will help.

Thanks in advance!
-Shaun-
Posted on: 2009/2/5 6:51
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bogus Re: 84 auto-manual swap
Grand Imperial Pooh-Bah
San Pedro, CA
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gee... I wish I knew...
Posted on: 2009/2/5 6:55
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anesthes Re: 84 auto-manual swap
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Boston, MA
646 Posts
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2008/6/18 18:02



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Quote:

subtleZ28 wrote:
I'm in the middle of swapping an 84 vette from auto to T56 (it is an LS1 swap).
I have the dash and bracing all apart. I purchased a set of pedals on CF, and they don't look like they will work.

The aluminum box is different shape on the new-to-me manual brake pedal (on the rear facing end, the master cylinder side is the same), and the pedal itself has too much material above the bushing, so it cannot be swapped into my aluminum box(I wish I had the proper term for that).

Also I cannot see where the clutch pedal and bracket will go.

Are 84 firewalls different between autos and manuals?

Is the bracing different auto vs manual?

What year pedals will work w an 84?

I'll try to get picks up tomorrow if that will help.

Thanks in advance!
-Shaun-


I did this on my '87. Everyone on CF gave the typical retarded corvette owner response "sell it and buy a manual". Centralcoaster was very helpful with some of the ZF6 specific stuff, and most everything else I had to figure out while laying on my back with my feet in the hatch.

The manual brake pedal is a direct swap.

Actually, here is a link to a writeup I wrote which should help you. If you need more specifics after reading it hit me up.

http://members.cisdi.com/~anesthes/projects/stick-swap/

-- Joe
Posted on: 2009/2/5 12:41
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subtleZ28 Re: 84 auto-manual swap
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Thanks Joe, I actually already have that link bookmarked.

I got info that maybe 90+ pedals are different, maybe that is what I got. I'm told 90+ doesn't have the aluminum cross brace under the dash. That would explain the difference in shape.
Posted on: 2009/2/5 13:28
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anesthes Re: 84 auto-manual swap
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Boston, MA
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Quote:

subtleZ28 wrote:
Thanks Joe, I actually already have that link bookmarked.

I got info that maybe 90+ pedals are different, maybe that is what I got. I'm told 90+ doesn't have the aluminum cross brace under the dash. That would explain the difference in shape.


The 90+ doesn't have the brace so the clutch pedal may be an issue. I used a clutch pedal out of an '89. Can you post a picture of your '90+ clutch pedal?

I have to run right now, but I have a ton of pictures of dashes apart on 89-91 so maybe we can figure out a solution.

The brake pedal however is the same and should work. The pedal itself. The brake pedal bracket, how it mounts is different between 89-90.

-- Joe
Posted on: 2009/2/5 14:41
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CentralCoaster Re: 84 auto-manual swap
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San Diego, CA
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84-85E pedals have a larger pin to engage the m/c eyelet. I thought it only changed after that in 1990, which is when the interior was changed.

I would look for a late85-89 pedal.

I don't know of any firewall differences. I would be surprised if there was.
Posted on: 2009/2/5 15:50
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1985 Z51, ZF6
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jhammons01 Re: 84 auto-manual swap
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I'm confused, you point out that there is an 84-85E C4, then when this guy is using an 84 chassis, you suggest that he looks for an 85-89 pedal.

Does that not confuse anyone else? It is almost reverse from what I thought you should say.

Understand, I have no clue either way, I'm just curious for discussion sake.
Posted on: 2009/2/5 17:44
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CentralCoaster Re: 84 auto-manual swap
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San Diego, CA
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I believe the 84-85E pedal is NLA and superceded by the later pedal. And all the master cylinders now are designed to fit the 86+ pin size anyways.
Posted on: 2009/2/5 18:29
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1985 Z51, ZF6
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BrianCunningham Re: 84 auto-manual swap
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Boston, MA for the most part :)
7763 Posts
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Which mounts are you using?

The LS is a lot different at the back, if you leave it at the stock location then you'll have to cut the firewall.

That's why the SpeedHound mounts move it forward.

Talk to JeffVette and what he did

Photobucket
Posted on: 2009/2/5 18:43
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subtleZ28 Re: 84 auto-manual swap
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2009/1/4 1:22



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My car was an early swap. It actually uses C5 style stands and has triangular chunks welded to the frame to mount to.

I'm not super confident in the welding, or placement (I don't even know who did it). I'm considering cutting all that out and finding stock frame mounts and going w speed hound or universal mounts. I want to run the melrose headers. The car currently have what I believe are f-body shorty headers.

I already deleted the HVAC stuff, and it clears the firewall otherwise. I feel for guys doing street car C4 LS1 swaps. Deleting the HVAC stuff made things way easier!
Posted on: 2009/2/5 18:51
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anesthes Re: 84 auto-manual swap
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Boston, MA
646 Posts
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2008/6/18 18:02



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Quote:

CentralCoaster wrote:
84-85E pedals have a larger pin to engage the m/c eyelet. I thought it only changed after that in 1990, which is when the interior was changed.


Hrmm. my pedal is from an '89. It clicks into the aftermarket ZF6 master I bought which has a plastic insert.

Do you happen to know the eyelet size for the 84-85E and later?

The eyelet is huge on my aftermarket master with the big plastic insert. I wonder if a different insert/bushing could be used for the different pedal.

Quote:

CentralCoaster wrote:

I would look for a late85-89 pedal.

I don't know of any firewall differences. I would be surprised if there was.


It's the bar that runs across the dash that is the issue between pre 90 and post 90. The pedal bracket bolts to that bar.

-- Joe
Posted on: 2009/2/5 19:19
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jhammons01 Re: 84 auto-manual swap
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Quote:

CentralCoaster wrote:
I believe the 84-85E pedal is NLA and superceded by the later pedal. And all the master cylinders now are designed to fit the 86+ pin size anyways.
ahhh gotcha
Posted on: 2009/2/6 18:49
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85L98-84L83 Re: 84 auto-manual swap
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113 Posts
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2008/1/7 0:00



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Just keep it stock and buy some wax and polish and a new duster(CF reply).

Lets get back to arguing which is better mothers or meguires(CF comment also)

I was banned from CF, couldn't get into that waxing thing.

Go ahead and rock that T56 hard.
Posted on: 2009/2/6 22:20
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85 vette - 3.54 gears,pulleys,160 stat,hypertech chip,K&N,no cat,B&B cat back,cut air lid,TB bypass,air pump elim pulley,air foil,Torque thrust II wheels,maaco paint job
84 vette - K&N,renegade,2 inch TB's,adustable fuel pressure to 15 psi,air pump e...
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subtleZ28 Re: 84 auto-manual swap
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Quote:

85L98-84L83 wrote:
Just keep it stock and buy some wax and polish and a new duster(CF reply).

Lets get back to arguing which is better mothers or meguires(CF comment also)

I was banned from CF, couldn't get into that waxing thing.

Go ahead and rock that T56 hard.


LOL!! (we don't have an lol smiley here?)

That is so true. I should also add a bra.

Another CF answer: why add an LS1 a SBC can make just as much power... blah blah blah... you should at least use an iron block so weigh stays the same.. blah blah blah...

I've already gutted the interior, and part of me wants to fog the whole thing flat black just to annoy the "wax it and keep it stock" corvette stereo-type crowd!
Posted on: 2009/2/6 22:33
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CentralCoaster Re: 84 auto-manual swap
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San Diego, CA
9454 Posts
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I recommend using at least three colors for added effect.
Posted on: 2009/2/7 4:22
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1985 Z51, ZF6
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subtleZ28 Re: 84 auto-manual swap
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15 Posts
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2009/1/4 1:22



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How about just really blotchy obvious rattle can flat black?

Anyway, back on track. I have a some-what local guy (also LS1 swapping an 84) going from manual to auto. He stopped buy and we traded pedals. They look like they will work (the ones I have must be 90+) , and he didn't see a lot that was different fire-wall wise.

Hopefully I will get some garage time soon and get the pedals installed.

The bad news is after getting the (correct) clutch pedal, the LS1 F-body clutch master will definitely not work...

---side note: Brian, you are still the King of the Avatar!!
WOW
Posted on: 2009/2/7 13:39
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vetteoz Re: 84 auto-manual swap
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2007/8/6 0:00



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Quote:
subtleZ28 wrote:
How about just really blotchy obvious rattle can flat black?


How did you see the hood on my car? and don't even mention the pro stock scoop to clear the HSR!
Waxer's and purist's only in my area;
if they drive pass the drag strip their car will blow up.
Posted on: 2009/2/8 0:01
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CentralCoaster Re: 84 auto-manual swap
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San Diego, CA
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Quote:

subtleZ28 wrote:

The bad news is after getting the (correct) clutch pedal, the LS1 F-body clutch master will definitely not work...



What part of it doesn't fit?
Posted on: 2009/2/9 2:57
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1985 Z51, ZF6
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subtleZ28 Re: 84 auto-manual swap
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15 Posts
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Quote:

CentralCoaster wrote:
What part of it doesn't fit?


The mounting bolt orientation is wrong. Also the vette set up mounts flat on the firewall, where the f-body master has an angled mounting surface.

I believe I read a vette master will work w and LS1/T56 hydraulic throw out bearing if a special line is fabricated to link the two. Hopefully the vette master or an aftermarket will fit the pedal set up and have the proper volume for the bearing.

Any input on that would be appreciated!
Posted on: 2009/2/9 3:51
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CentralCoaster Re: 84 auto-manual swap
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San Diego, CA
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The vette master is a pretty standard design. It's the fbody one that's the oddball.

Whichever vette master you use, check and make sure the bore is about the same.

Otherwise you might be getting too much or not enough throwout bearing movement.
Posted on: 2009/2/9 4:43
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