c-6 slipping in 3rd
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Senior User
Joined: Jan 2004
Posts: 105
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c-6 slipping in 3rd
I have a c-6 in my Highboy 390 4x4. I hauled some really heavy loads up a very steep hill. I ran low on tranny fluid and had to put in what the local grocery store had, { not the correct fluid] I drained the fluid and refilled with the right stuff. Now when my truck warms up it starts slipping in third gear then in all gears. I have a new tranny to put in it. Does this sound like I need to replace, or am I jumping the gun? I find that usually I think it is going to be a majoir repair and turns into something simple. I.E. adjust bands? Flush tranny?It has a new Modulator.
Laughing Gas
Joined: Apr 2001
Posts: 868
Likes: 3
From: New Glasgow, Nova Scotia
If it gets worse the hotter it gets I'm willing to bet you are in for a tranny change. A c-6 will take a tremendous amount of punishment but when the slip due to low fluid with a load and up hill too add to the stress, it doesn't take long to cook the bands. I cooked one from just towing a truck out of the garage ( it was a chevy I was towing-- dead weight) with the trans about 2 or 3 Qts low, by the end of the day all it did was get me home after work, made the driveway but would make it in the garage.
More Turbo
Joined: Aug 2007
Posts: 555
Likes: 2
From: Washington state
SOmeone verse me here, when one says "bands" in an auto trnny do you mean the clutch pack? I thought most autos used sets of steel circular flat rings and clutch material between them and there is several layers of ring/cluch ring/ring/clutch ring etc etc..
Am I way off here?
Am I way off here?
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Elder User
Joined: Dec 2007
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Two Bands, and I believe two clutch packs as well. When the bands and clutches work together normally it controls a planetary gear set that makes up your 1,2,3 and reverse gears. There is also a one way roller clutch built in as well.
Sidebar note: If anyone uses a transmission from a salvage yard? Some of the yards will intentionally drop the pan and remove the filter unit. That way the new owner will be forced to install a new filter, otherwise the warranty will be invalid.
S-
Sidebar note: If anyone uses a transmission from a salvage yard? Some of the yards will intentionally drop the pan and remove the filter unit. That way the new owner will be forced to install a new filter, otherwise the warranty will be invalid.
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Elder User
Joined: Dec 2007
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Please do not take this as an insult, it's hard to know someones understanding of auto/truck mechanics by just the typed word.
I'd strongly urge picking up a copy of a Haynes manual or Chilton's manual for your year/model. That will answer quite a few questions and be very valuable source of base line information.
S-
I'd strongly urge picking up a copy of a Haynes manual or Chilton's manual for your year/model. That will answer quite a few questions and be very valuable source of base line information.
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Thread Starter
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Senior User
Joined: Jan 2004
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Thanks I've never changed the filter before, I'm not insulted by the chiltons manual comment either. I've never seen the filter ,I have the tranny out now and have to swap the rear section onto my new tranny, Might as well put a new filter on and maybe a shift kit if it's not too much trubble. My truck had an extra cross member in the front that had to be removed. I unbolted it but it had to have two stuborn rivets groud out before it would clear. ,,,,,What a pain.
Elder User
Joined: Dec 2007
Posts: 739
Likes: 1
Yeah...these ol' beasts can be a pain.
The filter is not bad to change out. I'd recommend using an anti-seize stuff on the threads of the pan bolts when it's put back together. (don't ask..LOL)
As for shift kits? Well...you'll have the filter out of the way of the valve body at this point. It's pretty much following the instructions with the kit. Just use care with the valve body parts. I've not had a C-6 apart at this point (mostly a few GM's and others) Some use check ***** and springs that can fly around when you least expect it. The kits instructions should explain.
S-
The filter is not bad to change out. I'd recommend using an anti-seize stuff on the threads of the pan bolts when it's put back together. (don't ask..LOL)
As for shift kits? Well...you'll have the filter out of the way of the valve body at this point. It's pretty much following the instructions with the kit. Just use care with the valve body parts. I've not had a C-6 apart at this point (mostly a few GM's and others) Some use check ***** and springs that can fly around when you least expect it. The kits instructions should explain.
S-