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wacky trans

Old Dec 11, 2009 | 12:01 AM
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Default wacky trans

well my problem is getting noticably worse. ive heard people having this problem when its cold, but i have it when its hot. when i first start it and drive it shifts fine. when it does shift it shifts fine no grinding or slipping, but it doesnt like to shift, from 1st to 2nd it doesnt like to shift before 3k, and from 2nd to 3rd doesnt like to shift much at all, i have to let off the gas and hit it again, or let off completly, and sometimes even move my shifter from D to N back to D while keeping on the gas and then it shifts. im guessing its probably some type of sensor? i have no idea really just assuming because when it does shift it shifts nice and smooth. any ideas?
 
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Old Dec 11, 2009 | 12:14 AM
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hows ur fluid?
 
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Old Dec 11, 2009 | 12:18 AM
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You need to get access to a quality scan tool while driving, might well pinpoint the exact problem.
Anything anyone could tell you here would basically be a lucky guess if right, could be a number of things, including sensors.
 
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Old Dec 11, 2009 | 12:18 AM
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i checked it 2 weeks ago and it was low so i added lucas auto trans conditioner to top it off. (not the stop slip)
 
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Old Dec 11, 2009 | 12:19 AM
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like an OBDII scanner?
 
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Old Dec 11, 2009 | 12:34 AM
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like a transmission shops scan tool that can read the governor pressure sensors data
 
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Old Dec 11, 2009 | 04:00 AM
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If you ran it very low for a period of time, might have burnt something up with excess heat, lets hope not.
Have you determined why it is losing fluid ?

OBD2 readers are bare bones, like Sheriff says, most tranny shops have the bad a$$ scan tools that do extensive diagnosing.
Some shops will do this for free, some will charge $50 or so.
The ones that charge should refund this fee, if you have them work on your tranny.
Also can try running a craigslist add, offering say $30 to someone in your area to scan the vehicle while in motion.
Some out of work mechanic with one would be glad to do it, or a guy just looking for quick side jobs.
[These tools cost from $2,000 on up, thats why they are not very common for average DIY'ers].

Don't get me wrong, they don't always tell 100% exactly what is wrong, but if the readings come out Ok for the sensors, you'd probably be looking at something mechanical like worn bands, busted accumulator springs or some type of blockage in the lines, something along those lines.

Some guys have luck curing shifting problems by adjusting the tranny throttle cable, if they get even slightly out of adjustment that can play havoc with shifting, so you might look into that too, if only to eliminate it as a possible cause.
 

Last edited by xray99; Dec 11, 2009 at 04:12 AM.
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Old Dec 11, 2009 | 06:57 AM
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busted accumulator springs normally come with a tendancy to either buck before it shifts into 2nd or kinda plop into overdrive rather than a smooth shift.

what you want is someone that can read the governor pressure while the truck is shifting. the scan tool will show what the pressure should be and if it is about half or less than that value then you know that the governor pressure solenoid is gummed up with clutch dust.
 
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Old Dec 11, 2009 | 12:21 PM
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well i went to a reputable shop today and they had the $12000 scanner with all its updates, they charged me $55 for the scan and would credit it if i had the work done and it came up with the governer pressure sensor and solonoid werent at the same psi as the desired psi is was less than half so they need to be swapped and theyd do it for $350 so i figured it would cost about $200 total for all the parts plus the $55 if i didnt get it done there, plus aggravasion doing it myself, so for the extra $100 i let them do it. he also mentioned i had a TCC code, and that because i found part of my snap ring when i dropped the pan i should have it rebuilt but i dont really have the $350 now let alone the $1650 that they were asking which is a good price but i cant afford that now.
 
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Old Dec 11, 2009 | 04:41 PM
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Ok, so did that improve your shifting, and are you sure they refilled with ATF+4 ?
 
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