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May 8, 2016 | 07:27 PM

#16

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

Posts: 24,739

Likes: 2,669

From: SE Florida

Quote:

Originally Posted by Macrobb

I... think you are both agreeing with each other here...

That was my point - we are agreeing. This trans is toast. Even with no vacuum reverse would work. But this trans doesn't have reverse. So fixing the vacuum, if in fact it's bad, won't fix this trans.

Quote:

Originally Posted by tjc transport

i would still check the vacuum pump. it would really really suck to have the trans rebuilt only to find it still will not shift properly because the vacuum pump is bad

But how will that fix reverse?

Quote:

Originally Posted by PlumCrazy7

I agree, put a vacuum gauge on and verify before anything else. A lot of money has been made off of people with a "bad" c6 trans that only has 1st and reverse. A little bit of vacuum line and all is well.

This one DOES NOT HAVE REVERSE!!!!!!!!!!!!!!!!!!

May 8, 2016 | 08:18 PM

#17

mattb77

Thread Starter

Junior User

Joined: Jul 2011

Posts: 57

Likes: 0

Quote:

Originally Posted by Mark Kovalsky

That was my point - we are agreeing. This trans is toast. Even with no vacuum reverse would work. But this trans doesn't have reverse. So fixing the vacuum, if in fact it's bad, won't fix this trans.

But how will that fix reverse?

This one DOES NOT HAVE REVERSE!!!!!!!!!!!!!!!!!!

Just to be clear I do have reverse after the truck warms up about 5 min or so. I appreciate all the replays and will keep u up to date on what I find. I will start by checking lines and pump but I have a transmission that I bought with a 86 I've been parting out so I should be covered either way

May 8, 2016 | 09:10 PM

#18

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

Posts: 24,739

Likes: 2,669

From: SE Florida

That says to me the seals in the reverse clutch is old and hardened.

May 9, 2016 | 09:35 AM

#19

bashby

Post Fiend

Joined: Nov 2005

Posts: 7,437

Likes: 4

From: Charles Town, W bygod Va

Quote:

Originally Posted by Mark Kovalsky

That says to me the seals in the reverse clutch is old and hardened.

Any chance some sort of snake oil will soften them?

May 9, 2016 | 12:37 PM

#20

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

Posts: 24,739

Likes: 2,669

From: SE Florida

I've never tried that approach. I don't know if it will work or not.

May 9, 2016 | 03:14 PM

#21

southern-old-bold

Senior User

Joined: Aug 2014

Posts: 188

Likes: 0

Quote:

Originally Posted by Mark Kovalsky

I've never tried that approach. I don't know if it will work or not.

When faced with options of fixup fluids I prefer to visit the snake charmer and his shelf of new parts.

May 9, 2016 | 03:20 PM

#22

bashby

Post Fiend

Joined: Nov 2005

Posts: 7,437

Likes: 4

From: Charles Town, W bygod Va

I am not an additive guy as a rule, even if it did work for a while I'd be expecting it to break down again at an inconvenient time. Might be worth a shot in this case.

May 9, 2016 | 03:49 PM

#23

tjc transport

i ain't rite

Joined: Mar 2005

Posts: 65,580

Likes: 5,612

From: Marlboro Mental Hospital.

Quote:

Originally Posted by Mark Kovalsky

never said it would fix reverse Mark. all i was saying is that low vacuum will make a C6 not shift properly, and extremely low vacuum will make it not shift until you let off the throttle.
if he has a bad vacuum pump, replacing the trans will not fix the shifting problem.
i actually think he has two problems, low vacuum, and bad seals in the reverse circuit.

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May 9, 2016 | 03:53 PM

#24

tjc transport

i ain't rite

Joined: Mar 2005

Posts: 65,580

Likes: 5,612

From: Marlboro Mental Hospital.

Quote:

Originally Posted by bashby

Any chance some sort of snake oil will soften them?

Quote:

Originally Posted by Mark Kovalsky

I've never tried that approach. I don't know if it will work or not.

Quote:

Originally Posted by bashby

I am not an additive guy as a rule, even if it did work for a while I'd be expecting it to break down again at an inconvenient time. Might be worth a shot in this case.

my experience at the body shop with the snake oils is that they do not work. the lucas stop leak works for a little while, but every vehicle that i ever had come in that had snake oils added to the trans needed a trans put in it within a few weeks of adding it.