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Discussion Starter #1
just got my c-4 from jw , I notice they installed a soft plug in opening where speedo cable goes. have any of you heard of this ? can I take out the plug and use my speedo ?? this c-4 is mostly for street use & jw was aware of this when I made the order . they will be open monday but was hoping someone could help today .:confused:
 

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My Dynamic came with a small freeze plug type thing in the speedo hole. I used a sharp punch and poked through it at an angle so I could wedge it out. Just make sure you don't push it into the trans.
 

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Discussion Starter #3
so after you removed the plug , there was still a gear to run speedo? I can't imagine a reason for them to remove it , but I've seen some strange things in the aftermarket world!
 

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Yup, mine too. The worm gear portion of the set-up is machined into the output shaft so just knock the plug out and slide the speedo gear in. It should all be the same.
 

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Discussion Starter #5
very cool , many thanks for the imput! ya made my day .happy racing !! "no such thing as fast enough"
 

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Discussion Starter #6
:( I got bummer news from jw , they said my c4 has no provision to run speedo:( :( :( ...........:lol: but they did say autometer makes an elect. pulse speedo 5" so now I really need the mc machine aluminum dash plate as it is perfect for this speedo among other gauges.:joy: :joy: :joy: any one out there got a dash plate for sale ? I would pay $250.00 for one !!:evil:
 

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I don't understand why JW would remove the drive gear from the trans but I guess different companies do different things for unknown reasons. My Dynamic is a full race trans and it still had the gear. All I had to do was install the old T-5 cable drive mechanism and that was that. Anyway, good luck and I hope it works out OK for you.
 

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Discussion Starter #8
I don't understand either , my c4 is also a fully rollerized super comp ( minus a trans brake )trans with all the good stuff . they say ok to handle my big block with spray up to 1100 hp .the only thing I can think of is the output shaft is also an aftermarket piece with no provision for speedo . I am going to take out the plug anyway just to verify, does'nt hurt to look. I'm not thrilled about using a elect pulse speedo but what do you do? I can't put a car like that on the street & guess how fast I am going!this car will be a cop magnet........sigh......makes me wonder why I ditched my c6 thats now laying on my garage floor fully rebuilt with 0-miles. just trying to free up some ponies I suppose.
 

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Weird, must have swapped output shafts too.

You could always just RPM drive it. Find out what RPM is what MPH and keep it steady...or in that ballpark.
 
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