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1986,4+3 doug nash to th350 conversion

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Old 12-14-2011, 09:40 AM   #1
project C4
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Last edited by project C4; 02-23-2012 at 11:06 PM.
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Old 12-14-2011, 01:20 PM   #2
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Default Doug Nash 4+3

Are you interested in selling the Doug Nash? If so PM me
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Old 12-14-2011, 04:31 PM   #3
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Old 12-14-2011, 06:24 PM   #4
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Very nice conversion!

I see you have the C4 DNE speedometer signal generator in position - did the speedometer drive gear line up with it correctly???

What did you decide on for a 'shifter'???
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Old 12-14-2011, 09:07 PM   #5
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Originally Posted by project C4 View Post
I use a GPS in my vehicles anyway so not a big deal untill I get it fixed.
IIRC from my conversion, the speedo sensor also feed signals to the ABS and the ECU...as well as the speedometer & digital dash...

Roger at Speedometer Solutions might be able to help you out...He came up with a solution for my conversion!
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Old 12-14-2011, 09:20 PM   #6
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Looks great!
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Old 12-15-2011, 02:11 AM   #7
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I will be going to analog gauges in the future.
Exactly the opposite of my conversion. I went from the DNE 4+3 to a 4-spd trans w/cable speedometer actuation. I needed a cable operated signal generator.

Quote:
how will this effect my ABS brakes ?
I'm no expert, but here's what I understand happens...Every time you start the car, the ABS goes through a test cycle. The first part is electrical; the second part occurs when the car reaches 4 mph, when the modulator valve test is run. If there is no signal from the speedo/signal generator, then the test is not conducted and the ABS remains inoperative. This is more thoroughly explained in section 5E-3 & 5E-4 of the FSM.

Normal brake operation "remains fully operational"...

Last edited by Rich B.; 12-15-2011 at 02:13 AM.
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Old 12-15-2011, 08:45 AM   #8
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I have seen those. Autometer sells those for there electric speedometers
My plan is to get the factory speed sensor working and then hook an electric autometer to it.
Have you written/spoken to john_leahy@autometer.com about this??? According to John (for my conversion) "While our [AutoMeter] #5291 [pulse generator/sender] would physically fit, it *would not* drive the factory [C4] computer/cluster/etc. The signal is a square wave (vs your factory since wave) and the pulse count is far too high from our sensor as it's a high-end, high resolution sensor." That was in response to my using an AutoMeter pulse/generator to send the signals to my C4 digital dash/EFI/ABS/ECU.

If I understand you, you're going to try using the C4 sender to drive an AutoMeter gauge/cluster??? I would check with John first to make sure it will work...(You might need their sender/pulse generator)...
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Old 12-15-2011, 05:03 PM   #9
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I went from the DNE 4+3 to a 4-spd trans w/cable speedometer actuation.
I needed a cable operated signal generator.
http://tpiparts.net/inc/sdetail/10956/7586
Also do same for later ECM requiring 4000 pulse VSS input
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Old 12-16-2011, 09:42 AM   #10
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http://tpiparts.net/inc/sdetail/10956/7586
Also do same for later ECM requiring 4000 pulse VSS input
Here's a pic of the signal generator (in foreground) that Speedometer Solutions provided...

Click the image to open in full size.

It works great! No jittering, no error codes, speedo & odo read correctly, ABS tests OK, etc. I didn't like the idea of it being hidden under the car right on the trans, so they made me up a 48" cable extension and I fabricated a bracket to mount it in the engine compartment...

Click the image to open in full size.
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