C6 Transmission
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Junior User
Joined: Sep 2009
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From: Anchor, Tx
C6 Transmission
Ok guys i have a cross reference for yall. I have a 69 f100, but my transmission and transfer case came off of an 85 bronco. i've been told that my speedometer cable is supposed to thread into my transmission. then i was told, in the case of my tranny, my cable would thread into my transfer case. any of you guys know where it would thread in? cuz i can't tell. and drivetrain components ain't really my thing.
Lead Driver
Joined: Sep 2002
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From: Gateway to the West
You could follow your speedometer cable down from the firewall and see where it goes. The C6 had a speedometer gearing. Very few (if any) transfer cases had the speedometer gearing. Since the C6 was used so widely across the Ford vehicle line it is highly unlikely that the gearing is anywhere else but in the C6. It needed to have it for any vehicle that didn't have 4WD anyway.
Later models that require a VSS (Vehicle Speed Sensor) rather than a cable and gear have this sensor mounted in the rear axle housing and some aftermarket companies make an adapter that allows the VSS to be relocated to the t-case/transmission tail-housing.
Later models that require a VSS (Vehicle Speed Sensor) rather than a cable and gear have this sensor mounted in the rear axle housing and some aftermarket companies make an adapter that allows the VSS to be relocated to the t-case/transmission tail-housing.
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Lets start over.
A 4x4 with a two-speed TC, the TC is going to have to be the source for the speedo cable. Can't be the trans, as the trans is going to run 2.whatever times as fast when you are in low range.
A C6 trans for a 4x4 will have a different tailshaft housing that allows it to be bolted (married) to the TC.
In a 2wd C6, the speedo drive is in the tailshaft housing. Thus, there is no speedo provision in a 4x4 model, as it must come off the TC.
Am I right? Stand by, you might could get another response. Meanwhile, check the TC for a speedo output.
You will probably need a different cable to reach it.
A 4x4 with a two-speed TC, the TC is going to have to be the source for the speedo cable. Can't be the trans, as the trans is going to run 2.whatever times as fast when you are in low range.
A C6 trans for a 4x4 will have a different tailshaft housing that allows it to be bolted (married) to the TC.
In a 2wd C6, the speedo drive is in the tailshaft housing. Thus, there is no speedo provision in a 4x4 model, as it must come off the TC.
Am I right? Stand by, you might could get another response. Meanwhile, check the TC for a speedo output.
You will probably need a different cable to reach it.
Lead Driver
Joined: Sep 2002
Posts: 9,182
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From: Gateway to the West
Now lets simplify things... find the cut end of the cable that is still attached to the T-case or the tranny. Because if the end of the cable is not still attached to which ever device that device will leak fluid profusely at the HOLE where the speedo cable should be affixed! So, if neither the T-case or the tranny is leaking, then the other end of the cut cable is most likely still attached where ever it should be.
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Junior User
Joined: Sep 2009
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From: Anchor, Tx
that's a good idea cuz my buddy said he thought he noticed i had a transmission leak... but even still, would the tranny/t-case leak from the gear housing if there's only a threaded cable that's supposed to thread onto it? and i was wondering if speedometers might change with the year and model? or do is it the same basic setup for all models?
Cargo Master
Joined: May 2004
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I've got an AOD, the speedometer threads into the transfer case (BW 1356), picture is in MyGarage. 1990 DonKo
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Hotshot
Joined: Mar 2001
Posts: 13,559
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From: Manhattan, KS
My 78 has a C6/205 transfer combo and if I remember right the cable connects to the transfer case for the reasons the 85e150 mentioned.
I have a 203 transfer in the garage and can check it tonight. The 78 is parked in the mud(rained today) and I don't really want to crawl under it tonight after work.
I have a 203 transfer in the garage and can check it tonight. The 78 is parked in the mud(rained today) and I don't really want to crawl under it tonight after work.
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Hotshot
Joined: Mar 2001
Posts: 13,559
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From: Manhattan, KS
Checked the 203 transfer in the garage and the speedo gear/cable attaches to the rear tail on the rear of the transfer.(the area of the rear driveshaft yoke) I'm pretty sure the 205 is similar. Also, I noted that on the 203 there is an electrical connection in the same area and I think that is probably for a indicator light, but I don't really know because I have a C6/205 combo in the Bronco.
Sarge89, I'm not sure which transfer case your 85 would have. Maybe someone with an 85 knows what the options were for that year. The 203 is weaker than the 205. The 203 is a chain driven transfer and the 205 is gear driven. Hope that helps some. I also have a 75-82 Chiltons that may have some other spec infor if you need it.
Sarge89, I'm not sure which transfer case your 85 would have. Maybe someone with an 85 knows what the options were for that year. The 203 is weaker than the 205. The 203 is a chain driven transfer and the 205 is gear driven. Hope that helps some. I also have a 75-82 Chiltons that may have some other spec infor if you need it.
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Junior User
Joined: Sep 2009
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From: Anchor, Tx
ok. i think i noticed on the that end of the transfer case there were 2 lines coming out. one was torn and i couldn't even tell about the other... maybe that'll lead me to some answer.
Hotshot
Joined: Mar 2001
Posts: 13,559
Likes: 81
From: Manhattan, KS
The connection on the top of the tail is the electrical connection and the hole or line on the bottom should be the speedo cable connection. If your rear end ratio is different in the 69 compared to the 85, you can change the gear on the speedo cable to correct your speedometer reading. It has been about ten years since I did one, so I can't remember how to figure what teeth count you need on the gear to change, but a Ford parts department can help if you need to change it. The gears are pretty cheap cost wise.
Post Fiend
Joined: Mar 2002
Posts: 19,402
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From: Bonita Springs FL
Lets start over.
A 4x4 with a two-speed TC, the TC is going to have to be the source for the speedo cable. Can't be the trans, as the trans is going to run 2.whatever times as fast when you are in low range.
A C6 trans for a 4x4 will have a different tailshaft housing that allows it to be bolted (married) to the TC.
In a 2wd C6, the speedo drive is in the tailshaft housing. Thus, there is no speedo provision in a 4x4 model, as it must come off the TC.
Am I right? Stand by, you might could get another response. Meanwhile, check the TC for a speedo output.
You will probably need a different cable to reach it.
A 4x4 with a two-speed TC, the TC is going to have to be the source for the speedo cable. Can't be the trans, as the trans is going to run 2.whatever times as fast when you are in low range.
A C6 trans for a 4x4 will have a different tailshaft housing that allows it to be bolted (married) to the TC.
In a 2wd C6, the speedo drive is in the tailshaft housing. Thus, there is no speedo provision in a 4x4 model, as it must come off the TC.
Am I right? Stand by, you might could get another response. Meanwhile, check the TC for a speedo output.
You will probably need a different cable to reach it.