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Discussion Starter · #1 ·
I was doing about 60 on the highway when I suddenly
lost third gear And the Speedometer at the same time, tried to put it in
second: nothing......slowed down and tried first: YES! I pulled of the highway
and checked fluid etc....everthing is ok....reverse and first gear works
What could be wrong?? It's a 500 cui and Th425 FWD
Thanks!
 

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1976 Eldorado project
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I'm not familiar enough to really troubleshoot your problem, but...

The speedometer cable gets a signal from the governor assembly of the transmission, which contains the speedometer drive gear. The speedo cable goes from the transmission to the cruise control, then to the speedometer. The speedometer cable from the transmission drives the transducer, and a cable from the transducer drives the speedometer. This is what connects your problems.

As said before, someone else here will be able to connect this information to your problems more, but it seems to me like a speedometer cable, or possibly the vacuum modulator (controls downshifting) I remember when I started my project the speedometer cable going from the transmission to cruise control was burnt through from being so close to the exhaust manifold.
 

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Discussion Starter · #3 ·
Ok thanks! My friend also told me this, we're gonna take a look
at the govenor today and see whats up...
Other than that the car runs nice and has VERY good power...
I keep chirping the tires every time i take off...have to get used to 550 lbs and FWD:)
 

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JimsEldorado said:
Ok, pulled the govenor, the plastic gear was in two pieces....does anybody know where i can find a new one??? and is it the same govenor as in a th400??
A sturdy length of chain and a t-bone steak should keep the dogs at bay as you whisk into the yard at night...
 

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JTraik said:
A sturdy length of chain and a t-bone steak should keep the dogs at bay as you whisk into the yard at night...
Hahahaha

I would think that your best bet is to hit the scrap yards. The governor is easy to pull, as you know, so it won't be hard if you cna locate one.
 

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Discussion Starter · #7 ·
:) Belive it or not but a company that sells american car parts here in Sweden had the plastic gears in stock! ordered 2 of them.
I really hope this will solve my problem....if not, do you guys know if its possible to pull the tranny without pulling the engine? Looks like it is:)
 

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1976 Eldorado project
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Jim, it's very possible. It's all in my shop manual for the '76, and should be the same for you. Basically you just have to unbolt the mount from the tranny (not the crossmember) and unbolt the tranny from the block, and from the diff. Make sure you disconnect the grounding straps, vacuum line, etc etc. and drop it. I used a floor jack with a board on top of the pumpkin cup, but if you had to be all right about you get a tranny jack. The tranny doesn't weigh all that much either.
 

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Discussion Starter · #13 ·
terrible one said:
Jim, it's very possible. It's all in my shop manual for the '76, and should be the same for you. Basically you just have to unbolt the mount from the tranny (not the crossmember) and unbolt the tranny from the block, and from the diff. Make sure you disconnect the grounding straps, vacuum line, etc etc. and drop it. I used a floor jack with a board on top of the pumpkin cup, but if you had to be all right about you get a tranny jack. The tranny doesn't weigh all that much either.
Ok, thanks! Hopefully the gear will solve the problem though:crying2:
 
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