Tranny Cold Start Slippage
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Senior User
Joined: May 2004
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Tranny Cold Start Slippage
I started having problems with the tranny slipping on cold starts. I thought it might be time to change the filter and fluid. Its a 73 C4.
It still, on occasions, only when it is dead cold, slips for a couple minutes. I changed the modulator thinking that would help. My wife says I dont get paid to think.............
After the initial warm up problem, from dead start and on it hard, it shifts normal. On the kickdown, on it hard, it shifts as it should. It only slips when it is dead cold for a short time, like it is having problems building pressure in the pump.
Any tips, or should I just pull it and rebuild it? I have a C6 in the garage that has been rebuilt, but I am not sure it will bold up.
Thanks
It still, on occasions, only when it is dead cold, slips for a couple minutes. I changed the modulator thinking that would help. My wife says I dont get paid to think.............
After the initial warm up problem, from dead start and on it hard, it shifts normal. On the kickdown, on it hard, it shifts as it should. It only slips when it is dead cold for a short time, like it is having problems building pressure in the pump.
Any tips, or should I just pull it and rebuild it? I have a C6 in the garage that has been rebuilt, but I am not sure it will bold up.
Thanks
Hotshot
Joined: Feb 2004
Posts: 11,697
Likes: 3
From: Marengo, Iowa
How regular was the fluid changed over the years? What it sounds like to me is that the seals have gone hard, which happens with age, and can happen faster with infrequent fluid changes. The seals get hard, and won't seal, causing lower apply pressures, resulting in slippage. When the oil warms up, the seals soften with the temperature, and then eveything is normal.
i ain't rite
Joined: Mar 2005
Posts: 65,510
Likes: 5,565
From: Marlboro Mental Hospital.
before you pull it for a rebuild, try putting a bottle of lucas trans madic, or trans fix. (not sure on the name) if it works, and most of the time it will, you saved yourself allot of work. if it don't work, it will only cost you under $10.
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Thanks......
I used about a cup of brake fluid before I saw your post. Someone else had told me that too. When it first started slipping, I put a pint of motor oil in it. It took off!
I changed the fluid and filter. It worked for a bit, then started again. I then changed the modulator.
When that didnt help, I put in the brake fluid. It took a day or so, but started downshifteing and shifting right. It would never downshift before, so i thought it was the downshift rod out of whack.
The brake fluid has worked so far. maybe it will hold up til mid summer after I get the other one rebuilt and change it out.
Thanks.
I used about a cup of brake fluid before I saw your post. Someone else had told me that too. When it first started slipping, I put a pint of motor oil in it. It took off!
I changed the fluid and filter. It worked for a bit, then started again. I then changed the modulator.
When that didnt help, I put in the brake fluid. It took a day or so, but started downshifteing and shifting right. It would never downshift before, so i thought it was the downshift rod out of whack.
The brake fluid has worked so far. maybe it will hold up til mid summer after I get the other one rebuilt and change it out.
Thanks.
