Author Topic: Transmission problems  (Read 3626 times)

Tim175

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Transmission problems
« on: May 11, 2010, 12:47:14 PM »
Ok so i have no idea what happened. I was driving my truck home from class this morning when every time i would go up a hill the truck would struggle then shake and then finally get up the hill but very slowly. Then i finally got onto flat ground and it wont shift out of 1st and i can only go about 10 miles an hour. Any ideas on what the hell just happened?? Thanks if you can help.

Jeff73Mach1

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Re: Transmission problems
« Reply #1 on: May 11, 2010, 01:33:07 PM »
sounds strange-what kind of transmission is in the truck?

Is it an automatic?

Is the kickdown lever jammed?

Is the hose off the vacuum modulator?

Have you checked the fluid and if so does it smell burnt or does it feel at all gritty?

is it leaking fluid out the front seal?

give us some more details (and plan to call a wrecker :()


Tim175

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Re: Transmission problems
« Reply #2 on: May 11, 2010, 02:06:55 PM »
Its a C6 auto with less than 6k miles on it. It was rebuilt with all new hard and soft parts, as well as a shift kit and racing valve body at the same time the motor was. I check all of the fluids in my cars once a week and it was fine on Sunday when i last check. As for vacuum lines im not sure i would have to check.

Jeff73Mach1

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Re: Transmission problems
« Reply #3 on: May 11, 2010, 02:28:33 PM »
was the torque converter rebuilt as well?

C-6's are tough transmissions.  Hopefully it is something such as a band adjustment or other minor fix, but it is hard to guess at the cause.

I would definitely make sure the kickdown lever is working freely and that the shifter hasn't gotten out of adjustment (had that happen on a ford column shift one time)

I still would check the vacuum line running to the transmission, but I think that is unlikely to be the problem.

You could pull a line free from the radiator/transmission cooler and be sure it is pumping fluid and that the front pump is working, but again, that is a real longshot.

Will the place that did your rebuild warranty it?

Soaring

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Re: Transmission problems
« Reply #4 on: May 11, 2010, 03:01:14 PM »
On a C-6, if the vacuum line is not hooked up to the transmission, it will eventually change gears if the engine wounds up enough RPM, so that can't be the problem.  I would rule out the transmission and spend time trouble shooting the engine performance.  Spark (Timing) .....fuel....and compression.  The three things that make an engine run. Check them all. 

Tim175

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Re: Transmission problems
« Reply #5 on: May 11, 2010, 05:07:02 PM »
I think i found the problem, or at least part of it. I forgot that there is no kick down on the truck and i don't know why. If i punch the gas or climb a hill it will not down shift so i stay in third. I think that may have something to do with the problem. My 3,000 mile tune up is coming up this weekend anyway so ill just tackle everything this weekend.

Soaring

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Re: Transmission problems
« Reply #6 on: May 11, 2010, 08:02:15 PM »
Your transmission should automatically kick down to 2nd while climbing a hill, but that doesn't sound like your problem. I would focus your attention on the performance of that engine.   The vacuum system is somehow not functioning properly either. 

Tim175

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Re: Transmission problems
« Reply #7 on: May 11, 2010, 08:47:23 PM »
The motor has the same amount of miles on it as the trans. There is nothing wrong with it, no vacuum leaks, compression is perfect, timing is perfect, fluids are perfect all parts are new. The truck runs a 12.45 second 1/4 mile. Until the episode today i have never had a problem with daily driving, racing, or hauling.

Soaring

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Re: Transmission problems
« Reply #8 on: May 11, 2010, 08:56:11 PM »
Then check that kick  down problem. 

Jeff73Mach1

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Re: Transmission problems
« Reply #9 on: May 12, 2010, 10:22:52 AM »
Coil breaking down when it gets hot? 

Soaring

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Re: Transmission problems
« Reply #10 on: May 12, 2010, 02:06:50 PM »
I think we are trying to answer a problem that isn't a problem.  First you say the engine shakes etc, and that it won't shift up so that you can only go 10 MPH, Then you say the engine runs just fine, but the transmission won't kick down going up a hill.  Don't confuse us with what is really happening with the performace of that truck.  What Really is going on?

Tim175

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Re: Transmission problems
« Reply #11 on: May 12, 2010, 02:29:29 PM »
I never said that the engine was shaking? My description was all part of the transmission. This wasn't a motor problem, the transmission was not shifting 1-2-3 or 3-2-1. It wouldn't down shift when climbing a hill as it should, and it got worse the further i drove. By the time i was almost home it would not shift from 1st gear. All of which was previously stated. I'll take my question else where. If its that confusing i apologize.

Soaring

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Re: Transmission problems
« Reply #12 on: May 12, 2010, 02:43:59 PM »
Read your first post again.  The only thing that would cause your truck to shake would be a bad performing engine, or a transmission stuck in 3rd and under more load that it can handle because the engine is not producing enough power to pull it in 3rd.  So, now we are down to deciding what problem you have.  If you are convinced it is a transmission problem, then take it to a transmission shop.  Most likely the downshift rod fell off, and your transmission isn't getting the message from the carb that the rod is missing.  And, if it won't shift out of 1st, then that transmission is in need of some professional attention. 

 

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