c6 Transmission help

Clutch, transmission, rear axle

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Timd
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c6 Transmission help

Post by Timd »

I have a c6 in my 1969 F100 and it drives and might slip a bit but I am sure, my issue is that from a stop and in Drive my 8 year old can run faster than it can drive when I punch it, on the freeway I really struggle to get to 60MPH. Does anyone know what could cause this?

Fluid is leaking from bellhousing but I keep it where it needs to be.

Engine: 302 out of a 71 Torino

Thank you
1969 Ford F100 Custom Cab
302
Delta Bob
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Re: c6 Transmission help

Post by Delta Bob »

When you put the gas pedal down, does the motor increase RPM's before the truck starts going faster? That is a classic indicator of trans slipping.
On a side note, are you sure that the oil leaking from the bell housing is trans fluid? When the rear main seal is leaking, motor oil will leak from the same area.
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69Ford
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Re: c6 Transmission help

Post by 69Ford »

I had transmission fluid coming from what looked like the inspection plate on my C6. It turned out to be the O ring on the transmission dipstick luckily I already had the transmission cover inside the cab off. it would have been a pain to get at the bolt on the back of the engine that holds it in place. Here's my story. http://fordification.com/forum/viewtopi ... =2&t=83859
1969 Ford F100 Styleside standard cab 360 C6
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Re: c6 Transmission help

Post by Delta Bob »

Yeah, a friend of mine with an old Dodge PU had the same thing.
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69Ford
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Re: c6 Transmission help

Post by 69Ford »

Change the filter which is nothing but a screen in C6's mine was just about completely plugged.
1969 Ford F100 Styleside standard cab 360 C6
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Timd
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Re: c6 Transmission help

Post by Timd »

Where is the filter located?
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302
Busboy
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Re: c6 Transmission help

Post by Busboy »

Wow, if your trans is leaking out the front seal area and slipping....it's time for a new or rebuilt trans friend. Don't waste any money on changing the filter or anything else. There is no miracle cure for this other than replacement.
1967 F-100 4x4 custom cab.
Another 67 F-100 4x4 custom cab.
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1972 F-350 Sport Custom cab & chassis.
1972 F-250 Explorer Special, Camper Special.
1971 F-100 custom. 302, C-4, p.s. p.b. factory 65 amp alternator with transistorized voltage regulator.
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Re: c6 Transmission help

Post by DuckRyder »

A little better description of what is going on would help.

Filter is in the pan, if you drop the pan and don't find it full of clutch material a filter and a band adjustment might be worth a try.

My guess is that a overhaul is in your future though...

You sure it is a C6?
Robert
1972 F100 Ranger XLT (445/C6/9” 3.50 Truetrac)

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Timd
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Re: c6 Transmission help

Post by Timd »

It does not feel like it is slipping, what it feels like is I can punch it and instead of the truck taking off with all the power and speed I would expect, it feels like I am in a granny gear or something, however if I put it in first gear it performs as I would think. My 4 cylinder Mitsubishi has more power.

C6 Automatic.

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1969 Ford F100 Custom Cab
302
Delta Bob
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Re: c6 Transmission help

Post by Delta Bob »

Interesting. So, if you put it in 1st and start off then manually shift it to 2nd & 3rd its alright?
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Re: c6 Transmission help

Post by Timd »

I haven't actually tried to change gears once in first, didn't know if it would handle it. I am garaged until my power steering pump arrived then I will try it.
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Re: c6 Transmission help

Post by Timd »

This thing looks like it was leaking from everywhere, is that possible?
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Re: c6 Transmission help

Post by 69Ford »

Are you sure its a C6. here's a transmission identifier from LMC truck. http://www.lmctruck.com/icatalog/fb/full.aspx?Page=120
1969 Ford F100 Styleside standard cab 360 C6
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Re: c6 Transmission help

Post by Timd »

It has 17 bolts and the pan looks like the one in the picture.
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Re: c6 Transmission help

Post by Twisted_Steel »

Is it changing gears ok? If your modulator valve is bad.... or the vacuum line to it is leaking, it won't downshift to first gear, causing it to take off in second gear and make it feel like you are pulling a tank trying to leave from a stop.
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