F40 Questions

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   Howdy everyone. As David is well aware, I absolutely 

DETEST the "performance" four-speed that is currently 

bolted up to Gretchin's new heart (Seriously, it has zero 

redeeming qualities) which means behind brakes and an 

alignment, a new transmission is the next on my list of 

things to take car of.

Now, anyone who has spent two minutes with me knows I 

like to jump straight in to the "obscene and over-the-

top" end of the scale with things, which means I'm 

looking at doing an F40 Six-Speed swap. I had a few 

questions for the more technically minded of you:

The V8 Archie Economy Conversion comes with custom 

axles... Yet it says I'll need to buy G6 axles as well. 

Why is that?

The Transmission uses a digital output instead of a gear-

drive, anyone know if there's a way of getting them to 

play nice?

The flywheel from a G6 and a Fiero are 0.16" different in 

outside diameter, and have identical inside diameters. 

Does that mean a SPEC Alumnium flywheel could still be 

bolted up to it?

The G6 transmission weighs 112ibs, does anyone happen to 

know the weight of the four-speed?

I recognize there's a lot of questions there, but to 

anyone who answers, thanks in advance!

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Romeo Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Post God Joined: 16 November 2008 Location: Canada Status: Offline Points: 3033	Post Options Post Reply Quote Romeo Report Post Quote Reply Topic: F40 Questions Posted: 18 April 2013 at 12:12am
	Howdy everyone. As David is well aware, I absolutely DETEST the "performance" four-speed that is currently bolted up to Gretchin's new heart (Seriously, it has zero redeeming qualities) which means behind brakes and an alignment, a new transmission is the next on my list of things to take car of. Now, anyone who has spent two minutes with me knows I like to jump straight in to the "obscene and over-the- top" end of the scale with things, which means I'm looking at doing an F40 Six-Speed swap. I had a few questions for the more technically minded of you: The V8 Archie Economy Conversion comes with custom axles... Yet it says I'll need to buy G6 axles as well. Why is that? The Transmission uses a digital output instead of a gear- drive, anyone know if there's a way of getting them to play nice? The flywheel from a G6 and a Fiero are 0.16" different in outside diameter, and have identical inside diameters. Does that mean a SPEC Alumnium flywheel could still be bolted up to it? The G6 transmission weighs 112ibs, does anyone happen to know the weight of the four-speed? I recognize there's a lot of questions there, but to anyone who answers, thanks in advance!
	Never shift into reverse without a back-up plan.

D_sensitized Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Executive Member Joined: 25 March 2008 Location: Canada Status: Offline Points: 601	Post Options Post Reply Quote D_sensitized Report Post Quote Reply Posted: 18 April 2013 at 8:23am
	For the speedo, there's a simple circuit to wire up between the digital vss and the Fiero speedo that will get it all to play nice. I had to do it for my trans swaps, costs about 3$ for components and takes 5 minutes to make. I can find a diagram when I get home but it's easily googled. And on gmtuners site.
	-Harrison 88GT 3800 SC1 F23 5-speed Chilliwack

Romeo Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Post God Joined: 16 November 2008 Location: Canada Status: Offline Points: 3033	Post Options Post Reply Quote Romeo Report Post Quote Reply Posted: 19 April 2013 at 12:21am
	Okie dokie, well that helps alleviate one issue. =)
	Never shift into reverse without a back-up plan.

Medic Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 31 October 2010 Location: Canada Status: Offline Points: 121	Post Options Post Reply Quote Medic Report Post Quote Reply Posted: 19 April 2013 at 8:18am
	Check out the pennocks forums on my cars F40 swap. http://www.fiero.nl/forum/Forum3/HTML/000030.html It is quite involved. The calibration has been an issue for me, it works with a dakota digital but that causes interference which causes the speedo and tach to bounce causing the idle to bounce around at times. I suggest simply going with a GPS speedo and eliminate the issue all together.That's my next move. It is a known problem with Dakota calibrators and I got zero help from them when I tried to contact them, they did not even return my email requests for help. Hoefully pennocks will answer a few questions.
	88 GT Northstar 6 Spd

Medic Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 31 October 2010 Location: Canada Status: Offline Points: 121	Post Options Post Reply Quote Medic Report Post Quote Reply Posted: 19 April 2013 at 8:32am

	88 GT Northstar 6 Spd

D_sensitized Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Executive Member Joined: 25 March 2008 Location: Canada Status: Offline Points: 601	Post Options Post Reply Quote D_sensitized Report Post Quote Reply Posted: 19 April 2013 at 11:06am
	I forgot the f40s output a different signal then the f23 and 4t60s do. The gmtuners circuit won't work then. And if your going through the effort of the f40 swap, why not replace the engine while your at it?
	-Harrison 88GT 3800 SC1 F23 5-speed Chilliwack

Romeo Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Post God Joined: 16 November 2008 Location: Canada Status: Offline Points: 3033	Post Options Post Reply Quote Romeo Report Post Quote Reply Posted: 20 April 2013 at 1:49am
	I actually like the vulgar V6 in the Fiero, I've no desire to change it out on Gretchin. Just the transmission I absolutely loathe.
	Never shift into reverse without a back-up plan.

Dr.Fiero Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Post God Joined: 12 February 2007 Location: Canada Status: Offline Points: 1726	Post Options Post Reply Quote Dr.Fiero Report Post Quote Reply Posted: 20 April 2013 at 9:59am
	Just do an Isuzu swap. Great gearing, and it's a drop in (virtually). Way cheaper too.

Romeo Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Post God Joined: 16 November 2008 Location: Canada Status: Offline Points: 3033	Post Options Post Reply Quote Romeo Report Post Quote Reply Posted: 20 April 2013 at 10:18am
	Nope. Not as ridiculous. F40. lol
	Never shift into reverse without a back-up plan.

Medic Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 31 October 2010 Location: Canada Status: Offline Points: 121	Post Options Post Reply Quote Medic Report Post Quote Reply Posted: 20 April 2013 at 11:55am
	I have to agree with the Dr. Check the F40 gearing to make sure it is what you want. My first gear is pretty low but i have the power and revs to make it useable. The trannies are pricey and the swap a lot of work. Make sure you get a newer trans as the first couple years had a design flaw that caused the shifter fork to rattle at idle in neutral. I have this issue, it doesn't affect the trans, it is just an annoying noise. If you don't mind the issue you may be able to pick up an older one a little cheaper.
	88 GT Northstar 6 Spd

bcampbell Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 14 November 2011 Location: Canada Status: Offline Points: 160	Post Options Post Reply Quote bcampbell Report Post Quote Reply Posted: 21 April 2013 at 4:22pm
	Any reason you don't want to just swap in an F23? It seems like everyone who has one likes it; speaking from personal experience it shifts nicely although I'm still waiting on a couple parts to put it in my Fiero.
	'86 2m6 F23 5-speed, LSD, 3.5L LX9 '89 Firebird 3500T, T56