E40D - Cold Slip?!
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Joined: Sep 2006
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E40D - Cold Slip?!
So I was driving my truck up the on-ramp to the highway when I noticed I could split the needles with the converter locked. That is, I could get 200-300 more RPM and when I let off the throttle it would come back down to where it should be and lock again. While I was playing with this to see if it was my imagination the O/D light started flashing of course which confirmed it was not my imagination.. I panicked and took the truck to Aamco the next day. They did confirm a Lock-up Converter Slip code was stored. (I saw this on the scanner but I was pretty sure it would be there) Irronicaly on the Way to Aamco it was perfect. I could not get it to slip - and neither could the tech. The tech also thought the ATF smells alright - Not new but not burnt. So the pattern is - the thing slips a bit cold. It's perfect once it's even luke warm. Has anyone else noticed this behavior? Should I really spend $1600 on a rebuild right now? =) Most people might not even notice this but I don't listen to the radio much and watch gauges like a hawk. Considering how good the transmission works Once it has been driven for a few minutes - If anyone else had noticed this I might consider leaving it.
Senior User
Joined: Jan 2005
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From: Lake Sherwood, MO
mine dont slip but I have a chatter between 35 & 50 mph in OD... kick it out of OD and its fine.. you can drive through the chatter but it is sure annoying... same thing with the fluid looked good smelled good but there was alot of debris in the pan.... havent had codes checked though and no blinking OD light...what else can you ask for with 202,000 on the clock..
pat
pat
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Joined: Jun 2005
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From: Oshkosh Wisconsin
I was told ( i know it's a myth ) that tranny fluid shouldn't be changed if the vehical has over 100,000 miles on it? I have 164,000 and my tranny fluid looks pretty nasty... is it safe to still do it? Are there any special fluid brands to run in a psd?
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From: Silver Lake Dunes, MI
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Tuned
Joined: Dec 2006
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From: houston,tx
Many transmissions may show their age through slippage, because internal seals start to harden then soften as they warm up. there are alot of pros and cons about changing the fluid on high milage trans. it wont take much to pull the pan and look in the bottom for excess fiber and metal, some may be present and still go a long time. if you still are worried about changing the fluid at least put a new filter and re-use the old fluid if it seems o-k. if u add new fluid you may have to put a shudder additive
for the torque converter.
for the torque converter.
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Junior User
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I don't know about you guys but I've never seen a ATF filter with anything caught in it. My understanding is that the manufacturer specifically recommends the filter not be changed. I will change the fluid when I get a chance and see how it goes... Considering it works perfect once it's warm I'm not prepared to Tear it down just yet.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com
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Joined: Dec 2006
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You may want to try Lucas Trans Fix fluid when you change the fluid. It will rejuvinate the seals and friction material to extend the life of the tranny. I use it during rebuilds. It also has properties that lower trans fluid temps which is real important on E4ODs.
Good luck with it.
Good luck with it.
Tuned
Joined: Dec 2006
Posts: 291
Likes: 4
From: houston,tx
the filter is there to trap particulate matter thats generated from the clutch frictions. after enough accumalation flow slows down and flow becomes marginal, enough so that the pump can't provide enough pressure/volume for the trans. to make a good clutch selection or apply.
my neighbor used that Lucas additive with good results , i like Lubeguard.
my neighbor used that Lucas additive with good results , i like Lubeguard.
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