cold transmission slips every morning - TheDieselGarage.com
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post #1 of 15 (permalink) Old 02-19-2008, 07:55 AM Thread Starter
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cold transmission slips every morning

Hey all,

When my '97 auto tranny is cold in the morning and I first take off it will slip going into 2nd gear. I have to stop, put it in park, then in drive again and it will take off again. We go through this fun chain of events every morning until after the second or third time it will finally run normal, then never do it again for the rest of the day. It does it less if I really warm the truck up for a long time but at these fuel prices...

Any ideas as to what this could be? And on the topic of the transmission, is it normal for the torque converter to 'thud' the whole truck when it kicks off?

Finally, could any of this have to do with my horrible fuel mileage (about 10)?

:sofa

1997 Dodge Ram 3500 ex-cab dually 4X4 w/CTD, 152K, 4" exhaust, BHAF, Pacbrake, mystery switch, Banks gauges, Hadley airhorns, 235/85/16 Toyos, viper alarm/remote start/turbo timer, limo tint, rhino liner, custom-built woodchip box, backup camera, rear auxiliary floods, bright white exterior w/tan leather interior, Garmin GPS, Cobra CB & radar unsure of engine mods yet
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post #2 of 15 (permalink) Old 02-19-2008, 08:08 AM
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In general, I dont have a specific answer to any of the above questions, though when I start my truck in the AM here (socal) usually if i take off RIGHT away, it will lurch into first right when i drop the shift lever into D ( and this is on a VERY slight uphill incline). If I give it 3-5 minutes to warm up (usually around end of week, IE thursday or friday) it will shift into gear smoother and not hesitate when I drop the shifter.

Granted this problem has really only been aparent since I ran my tranny low on fluid then changed fluid and filter, it still kinda is odd to me, though perhaps a 47RH guru will pop up on here and have some answers to the situations we are both facing-

Oh, and on any given morning (for anyone whos going to post answers) the temp here when I startup is between 40*-55*F.

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post #3 of 15 (permalink) Old 02-20-2008, 04:42 AM
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If you are worried, change the fluid and filter. Take a look at the old oil, see it smells burnt or has metal pieces in it.
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post #4 of 15 (permalink) Old 02-21-2008, 04:08 AM Thread Starter
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will swap filter & fluid

Changing the filter and fluid will be what I do next. On the stick it doesn't look real bad but it's not new either. I once saw in a post another guy complaining about this same thing but couldn't find the post to see if he got to the bottom of it. Something was mentioned about 'pressure' taking too long to build...?

1997 Dodge Ram 3500 ex-cab dually 4X4 w/CTD, 152K, 4" exhaust, BHAF, Pacbrake, mystery switch, Banks gauges, Hadley airhorns, 235/85/16 Toyos, viper alarm/remote start/turbo timer, limo tint, rhino liner, custom-built woodchip box, backup camera, rear auxiliary floods, bright white exterior w/tan leather interior, Garmin GPS, Cobra CB & radar unsure of engine mods yet
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post #5 of 15 (permalink) Old 02-22-2008, 01:34 PM
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I would change the trans fluid and filter first. Could be as simple as that.

Does the trans start in 1st or 2nd from a stop? Go to 1st on its own or manually? Either way, there is a chance you might need to replace the governor pressure sensor and gov. press. solenoid. ~$100 a piece. Have to drop the valvebody to change them out.

The stock transmissions don't flow much oil in park. That is why you have to check the level when it in neutral. The T/C drains back overnight sometimes, so try putting the trans in neutral for about 30 seconds after startup. That will fill it back up.

Cold oil will cause the trans to feel like it grabs when you put the trans into gear. Once it gets warmed up, it won't do it as much. It is even more so when you have a built trans like mine. The T/C is quite a bit tighter than stock, and pulls harder when in gear and not moving. I can roll uphill with a loaded trailer at idle sometimes.

NukleusX- dd has a 47RE, not a RH, so the cause might be different than yours.

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post #6 of 15 (permalink) Old 02-22-2008, 03:32 PM Thread Starter
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It's getting the transfluid and filter change tomorrow. I wanted to do it myself today but got under there and there is no drain plug?! Do I have to drop the pan or is there some sneaky way to drain it from a hose somewhere?

It does take off in 1st and shift back down to 1st o.k. I will warm it up in neutral some and see if that and the fluid/filter change fix it. Once it takes off out of the driveway there isn't another transmission issue the rest of the day...that fluid must make it's way everywhere.

1997 Dodge Ram 3500 ex-cab dually 4X4 w/CTD, 152K, 4" exhaust, BHAF, Pacbrake, mystery switch, Banks gauges, Hadley airhorns, 235/85/16 Toyos, viper alarm/remote start/turbo timer, limo tint, rhino liner, custom-built woodchip box, backup camera, rear auxiliary floods, bright white exterior w/tan leather interior, Garmin GPS, Cobra CB & radar unsure of engine mods yet
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post #7 of 15 (permalink) Old 02-23-2008, 03:11 AM
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Ya, no drain plug. Could oder an aftermarket pan with one, or get a drain plug kit from B&M.

No real good way to drain it. I remove all but one bolt on a corner, just loosen the last one and support it with you hand. Gently let it tip down and hopefully most of it hits the pan. Just don't let it hang there. Could bend the corner.

"Some people are educated beyond their intelligence."

'93 W350 CC, LE, 5spd, HTT modded H1C, 4" DE

Sold- '99 3500 Q/C, SO CTD, 4x4, 5spd.

Traded off- '97 3500 C/C, 4x4, CTD

'92 W250, LE, CC, CTD w/ tweaked pump (SOLD)


"Obama = Hoax and Chains"

If Obama is the answer, it must have been a stupid question.
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post #8 of 15 (permalink) Old 02-24-2008, 03:54 AM
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I would just add 2 quarts of fluid, waayyyyyy back in the day my truck did this too, turns out it was just low enough on fluid to cause this issue when cold.
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post #9 of 15 (permalink) Old 02-25-2008, 03:51 PM Thread Starter
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progress

It reads full on the stick but maybe the stick isn't giving me a true measurement...when yours was low did it read low on the stick? Is there major harm if I slightly overfill?

bmoeller, warming it up in neutral stopped it like you said! No slip at all after only 60 seconds warming up in neutral...good call. I still want to get to the root of it so I will do the fluid/filter change (as soon as my 8 month old lets me).
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1997 Dodge Ram 3500 ex-cab dually 4X4 w/CTD, 152K, 4" exhaust, BHAF, Pacbrake, mystery switch, Banks gauges, Hadley airhorns, 235/85/16 Toyos, viper alarm/remote start/turbo timer, limo tint, rhino liner, custom-built woodchip box, backup camera, rear auxiliary floods, bright white exterior w/tan leather interior, Garmin GPS, Cobra CB & radar unsure of engine mods yet
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post #10 of 15 (permalink) Old 02-25-2008, 05:56 PM
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There is a check valve on the tranny line to cooler that is supposed to keep fluid in the TC. This valve can stick. Shut = bad ju ju, no fluid flow. Open = TC drains down overnight giving your truck "morning sickness". Putting it in neutral for a bit fills the TC again and off it goes like it's supposed to. Some have removed this valve to prevent it sticking shut. Just need to remember to let it sit in neutral for a few seconds on first start after it sits for a long time.

Carl in San Diego with a 95 2500, Junk Dodge paint, BHAF, modded TC and valve plate, 16* timing, full gauges, tranny cooling fan, gutless CAT, lockup switch with #5 plate for now.
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