Speedometer Cable
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Mountain Pass
Joined: Jun 2021
Posts: 139
Likes: 3
From: Dallas, Texas
There is a speedo gear in the transmission that comes out easily once you remove the cable adapter. I downloaded a GPS speed check app and surprisingly my speedo is pretty accurate. It's dead on up to about 50mph and then starts to read a little slow. 65 on the speedo is 68, 70 is 74/75. I'm not sure I can expect it to be much more accurate than that. I can only assume that the PO changed the gear when he put the 31" tires on the truck.
On another note, I'm leaking transmission fluid at the speedometer cable adapter. I took it out of the case and it looked like it had a slot for an o-ring but there wasn't an o-ring on it. There also isn't any seal between the driven gear and the adapter. I fished an O-ring out of a bucket of O-rings I have and put one on the adapter and took it for a drive but it's still leaking. I've looked all over the Internet and it looks like the housing and adapter I have is rare so I haven't been able to find the parts I need or even any information as to whether or not there should be a seal of some sort on the gear itself. I was thinking I might have to stop by an transmission shop and see if anyone there can tell me what I need to seal that up but if anyone on here knows, I'd appreciate any info you have.
On another note, I'm leaking transmission fluid at the speedometer cable adapter. I took it out of the case and it looked like it had a slot for an o-ring but there wasn't an o-ring on it. There also isn't any seal between the driven gear and the adapter. I fished an O-ring out of a bucket of O-rings I have and put one on the adapter and took it for a drive but it's still leaking. I've looked all over the Internet and it looks like the housing and adapter I have is rare so I haven't been able to find the parts I need or even any information as to whether or not there should be a seal of some sort on the gear itself. I was thinking I might have to stop by an transmission shop and see if anyone there can tell me what I need to seal that up but if anyone on here knows, I'd appreciate any info you have.
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
Sure. Remove the speedo cable out of the trans or transfer case if it's a 4X4. On the cable's end you will see the gear I referenced. It is held in place by a "C" shaped metal clip. Remove the clip and the gear will slide right off.
And OP, there should be an o-ring on the adaptor but not the gear. If still leaking, you might have installed an o-ring that is too thin walled.
And OP, there should be an o-ring on the adaptor but not the gear. If still leaking, you might have installed an o-ring that is too thin walled.
Mountain Pass
Joined: Aug 2019
Posts: 187
Likes: 14
Sure. Remove the speedo cable out of the trans or transfer case if it's a 4X4. On the cable's end you will see the gear I referenced. It is held in place by a "C" shaped metal clip. Remove the clip and the gear will slide right off.
And OP, there should be an o-ring on the adaptor but not the gear. If still leaking, you might have installed an o-ring that is too thin walled.
And OP, there should be an o-ring on the adaptor but not the gear. If still leaking, you might have installed an o-ring that is too thin walled.
Thread Starter
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Mountain Pass
Joined: Jun 2021
Posts: 139
Likes: 3
From: Dallas, Texas
My bad, I should have included a pic in the original post. Here is my speedo gear adapter. There is a metal gear in the trans but it's a metal to metal joint between the gear shaft and the cable adapter so nothing there to stop a leak. Seems like there should be something there?
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