Ford Transmission Issue

Hockeygoon · Feb 19, 2021

Looking at an old 1980s Ford F150 with a C6 transmission. The guy appears honest and told me that the truck runs fine and the transmission works good - until the transmission warms up then the truck quits moving. Is this a torque converter issue or a pump issue - or no one knows until you tear it apart issue?

wore out · Feb 19, 2021

(quoted from post at 20:04:54 02/19/21) Looking at an old 1980s Ford F150 with a C6 transmission. The guy appears honest and told me that the truck runs fine and the transmission works good - until the transmission warms up then the truck quits moving. Is this a torque converter issue or a pump issue - or no one knows until you tear it apart issue?

Budget for a transmission replacement or walk away.

The problem is "deeper" than a "torque convertor" or "pump" issue.

504 · Feb 19, 2021

It probably started out as a clutch pack seal, and by now is a band issue. Great heavy duty transmission,you will need a rebuild or a remanufactured one.

Bruce(OR) · Feb 19, 2021

Frictions are burnt up. Bands, clutch disc, etc. As has been said, time for overhaul and that includes a new converter. Don't need a worn out converter in front of a rblt trans and you would never get all that dirty oil drained off or the debris out of it.
You can probably find a rblt C6 online cheap enough.

jimg.allentown · Feb 20, 2021

Most likely, the filter is plugging up as it warms up. As the oil warms,it draws material from the bottom of the pan into the filter plugging it. When it cools off, the material drops back to the bottom of the pan until the next time it is run.

That material is friction material from the bands and clutches most likely. There is not one thing that is making it quit, but rather a combination of things. As others have said, it is time to replace the transmission.

Forward motion depends on the rear clutch pack. If that fails, you get no forward motion. The front band only affects second gear. The rear band is mostly for reverse. The front clutch pack is for high and reverse. No one friction unit will prevent the transmission from operating in at least one range.

Hockeygoon · Feb 20, 2021

Is there a difference between a 1992 C6 and and a 1984 C6 if they are both small bolt pattern and 4X4?

Bruce(OR) · Feb 20, 2021

Last I knew, the C6 was for the larger engines and the C4 was for the smaller engines. That shows about how long I have been out of it. Your best bet is a web search and see what develops. If still unsure, a phone call to a re-builder in town should do the trick. Sounds like your buying a used unit. Figure 125K miles is a fairly worn out C6.

Hockeygoon · Feb 21, 2021

The small pattern C6 has been around since 1974 - in the 1980s nearly all the F150s and most of the F100s came with the C6 (300 6, 302, and 351) from the factory - very few came with the c4 or c5 transmission.

Ford Transmission Issue

Hockeygoon

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wore out

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504

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Bruce(OR)

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jimg.allentown

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Hockeygoon

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Bruce(OR)

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Hockeygoon

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