c6 Transmission help

[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

[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.

[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

[Delta Bob]

Yeah, a friend of mine with an old Dodge PU had the same thing.

[69Ford]

Change the filter which is nothing but a screen in C6's mine was just about completely plugged.

[Timd]

Where is the filter located?

[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.

[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?

[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.

Thanks

[Delta Bob]

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

[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.

[Timd]

This thing looks like it was leaking from everywhere, is that possible?

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[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

[Timd]

It has 17 bolts and the pan looks like the one in the picture.

[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.