Question: Does anyone have a decent picture of...

[Mac]

Does anyone have a decent picture of where/how the speedo cable connects to the Muncie? Mine keeps working itself loose and I'm starting to wonder if I've hooked it up wrong or if I'm missing a retainer of some sort...

-Mac

 

[Vettehead Mikey]

I forget which rear end you've got (on the car) but many '73s use a right angle adapter between the cable and the transmission. Mine does with a 3.36 ratio.

The cable screws into the adapter and the adapter attaches with a forked plate bolted to the transmission..

Don't have a pic handy but I think there's an illustration in the AIM.

 

[Mac]

I believe my rear diff is 3.08 but I have that right-angle adapter. What I don't have is the forked plate. I pressed the adapter on by hand and it "clicked" and appeared tight so I thought it was fine but after a hundred miles or so, it worked loose.

I don't have an AIM. Any chance of you scanning the appropriate page and either posting it or sending it to me via email?

-Mac

 

[gmjunkie]

I believe my rear diff is 3.08 but I have that right-angle adapter. What I don't have is the forked plate. I pressed the adapter on by hand and it "clicked" and appeared tight so I thought it was fine but after a hundred miles or so, it worked loose.

Mac,I'll dig around here,I should have one or two of thous Fork'n Things!!!

 

[Mac]

Mac,I'll dig around here,I should have one or two of thous Fork'n Things!!!

Thanks, Junkie. See... this is why you should be President... you care about people!

-Mac

 

[Vettehead Mikey]

I don't have an AIM. Any chance of you scanning the appropriate page and either posting it or sending it to me via email?

-Mac

I consulted my AIM and Doc Rebuild's catalogue.

http://www.docrebuild.com/dr-r-web/SPEEDO.PDF

Both specify that you need a flat plate (item D) instead of one of them fork'n plates (item H), stating that the later is for Auto trans only. That's fine except my car is a four speed and has had the fork'n plate for at half it's life. ????

 

[Mac]

Thanks for the link, Mikey. The fork'n fitting looks more secure to me but perhaps the picture doesn't do the flat plate justice? Given a choice, I'll fork the old girl.

-Mac

 

[Mac]

Okay now this is just weird. My memory (as usual) was wrong or the problem was different this time. My light died so I was operating pretty much by feel but rather than being loose at the tranny, it was separated at the adapter!

I unscrewed the cable and brought the adapter out into the sun. There is no sign of a retaining clip, just a groove on the inside. The grease in it was pretty ugly so I cleaned & restuffed it, then slid it back. It "clicked" when it went into place and I couldn't pull it off by hand, so I screwed the cable back in. Hopefully, the clean-up and new grease allowed whatever retainer is on the geared end to function.

-Mac

 

[fine69]

Okay now this is just weird. My memory (as usual) was wrong or the problem was different this time. My light died so I was operating pretty much by feel but rather than being loose at the tranny, it was separated at the adapter!

I unscrewed the cable and brought the adapter out into the sun. There is no sign of a retaining clip, just a groove on the inside. The grease in it was pretty ugly so I cleaned & restuffed it, then slid it back. It "clicked" when it went into place and I couldn't pull it off by hand, so I screwed the cable back in. Hopefully, the clean-up and new grease allowed whatever retainer is on the geared end to function.

-Mac

Hi Mac,

On both my cars, there is a small, flat rectangular metal that is held in place by a bolt... this piece fits into the groove you described.

Ralph

 

[Bill75]

Hi Mac,

On both my cars, there is a small, flat rectangular metal that is held in place by a bolt... this piece fits into the groove you described.

Ralph

Just in case this helps, a little greasy but just like Ralph said.

 

[Mac]

Thanks, guys.

From what I can gather, both Mikey and I have speedometer 90 degree adapters on our 73s... so we're slightly different than the posted picture. I don't know enough about these adapters to figure out why mine keeps dropping off. It's clear from the marking on it that the adapter is an AC product but, from the brief bit of research I've done, it appears to normally be for adjusting ratios so the speedo is accurate.

If someone knows more about these adaptors, please let me know.

-Mac

 

[Mac]

This isn't exactly the same as the adapter I have but the basic idea is the same...

-Mac

 

[Mac]

Well, folks, it turns out that image which I added in the last post is the new version of the adapter. I pulled out the old one and bought a new one. The new one is more compact and fits nicely plus it has a grease nipple. Here's a picture of the two side by each.

The old one appears to have a ratio stamped on it (1:0.88) which makes me think bad thoughts. The new one appears to be 1:1... so I might have to replace the actual plastic gear to get the right ratio for the speedo.

Why is nothing ever easy?

-Mac

 

[Vettehead Mikey]

Mac,

If that's your old adapter at the bottom of the pic, I now understand your problem. It's done broked itself. The fork'n plate we've been discussing won't help.

You and I need (?) a .88 adapter to get the speedo to indicate properly and for no other reason. The variety of plastic gears are either too high or too low for us-ens. You may as well not bother installing a 1:1 adapter, just run the cable straight in.

Maybe find another .88 adapter?

 

[Mac]

Yep, that's the old one. It's much more elegant than the new one. My holder plate is the tag rather than the fork'n one.

I guess this means I've got a 3.36 rear diff, same as yours? I hung the 1:1 adapter on for now so there's no kink in the speedo cable. Better to have an inaccurate speedo than nothing which is how I've been running for the last little while. So far, no visits with my brothers-in-badges but only by luck.

As far as the old one, I can't figure what retained the two pieces together. If it was a friction/pressed fit, it isn't obvious and it failed. There's no sign of any type of retainer. From my quick research online, 0:88 adapters aren't common so replacing it might not be easy.

Worst come to worst, I will drill & tap a set screw and reuse the old one.

-Mac

 

[Vettehead Mikey]

I believe your car has a 3.70 rear end, that was standard for L82 cars. My AIM shows a .88 adapter for L82/w 4 speed.

 

[Mac]

I believe your car has a 3.70 rear end, that was standard for L82 cars. My AIM shows a .88 adapter for L82/w 4 speed.

Thanks again, Mikey. Eventually, I'm going to have to break down and buy an AIM so I'm not pestering others for these kind of things. The 1:1 works for now until I can either repair or replace the .88 adapter.

-Mac