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96 Dodge Ram1500 transmission/need input please
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Jim Hancock View Drop Down
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    Posted: 03 Aug 2018 at 1:05am
Folks, I'm needing some input of where to start looking and checking into why my transmission won't shift into 4th(OD) except when it wants to. 
It'll shift into OD on first startup and start driving when the air temperature is really cool to cold. But after the engine gets to operation temperature and i come to a stop at a light or sign and take off again, it won't shift on up again. 
It will, however, shift up when I disengage the OD, essentially, shifting into gear 3.5. 
Well, I can putt around town and get to where I'm going within a reasonable about of time with a few extra minutes added, I just figure in leaving a little earlier. 
Then, on the hotter days of this year, I'd forget to disengage the OD and it'd shift into 4th and stay there until I came to a stop again. 
As long as I was moving, it wouldn't come out of 4th. 
Even the real cool spell earlier this week, it wouldn't shift into 4th, no matter how much I'd throttle tease it up and let off the gas. 
So, back to gear 3.5. 
At times, it'd shift on it's own to OD when I'm just dinkin' along on low rpms and a slow take off and no hurry. Other times, NOT. 
Getting around at 45-50 isn't so bad as it sure saves on the gas as it'll do 15mpg consistantly in the 1700-1750 rpm range, which is where I try to keep it, unless I've just "got" to be somewhere. 
Thanks again for any and all input of what and where to start looking. 
BTW: had the transmission rebuilt about 70,000 miles ago at 304,000 miles.
It rides real nice and I'd like to take it on road trip as needed. 
How blessed we are by HIS GRACE!
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Amos View Drop Down
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Joined: 11 Sep 2009
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Points: 1318 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Amos Quote  Post ReplyReply Direct Link To This Post Posted: 03 Aug 2018 at 6:36am
Is it not shifting into OD or is the toque converter not locking up?  I have had both issues with them.
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Jim Hancock View Drop Down
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Points: 1112 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Jim Hancock Quote  Post ReplyReply Direct Link To This Post Posted: 03 Aug 2018 at 8:54am
Amos, 
It'll shift into OD when it's real cool outside or on occasion when I'm driving real slow but hardly never if it's hot out. 
But then, make a liar out of me like it did the other day when it was 90* + and it shifted into OD, just like it was supposed to. 
The intermittent shifting into OD is what has me scratching my head and why I'm asking questions here, given this behavior. 
It's not shifting in & out constantly, either it will or it won't. 
If it won't, I'll disengage the OD and it'll shift up that "half gear". 
I suppose you could say that the converter isn't locking up to get it to shift into OD, if my concept is correct. Maybe not, though. 
I just know that it'll shift normal in the 1st 3 gears, and maybe it will - maybe(more than likely) it won't, shift into OD. 
I'm not "that" schooled in automatic transmissions yet, but getting there.  So, I'm asking here. 


Edited by Jim Hancock - 03 Aug 2018 at 9:03am
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Stan IL&TN View Drop Down
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Points: 6730 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Stan IL&TN Quote  Post ReplyReply Direct Link To This Post Posted: 03 Aug 2018 at 9:38am
Daughters car would not downshift into first so if you stopped and took off it would be in 2nd.  Only time it was in first was on first startup after starting engine.  It turned out being the computer that was bad and not the transmission at all.
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shameless dude View Drop Down
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Points: 13607 		Post Options Post Options   Thanks (0) Thanks(0)   Quote shameless dude Quote  Post ReplyReply Direct Link To This Post Posted: 03 Aug 2018 at 10:28am
mine won't go into OD below 35 MPH. sposed to be like that. you should never drive around town with it in OD, OD is the weakest part of the tranny. you let it shift back and forth a lot dinking around, soon you won't have it anymore. try hand shifting it after getting up to speed. leave in 3rd gear until out on the road at a faster speed then shift by hand into OD.
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Amos View Drop Down
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OD solenoid is worn out/ defective/toast is what I think is your problem, not unusual to have go
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DiyDave View Drop Down
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Points: 54030 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DiyDave Quote  Post ReplyReply Direct Link To This Post Posted: 04 Aug 2018 at 5:42pm
Originally posted by Jim Hancock Jim Hancock wrote:

Folks, I'm needing some input of where to start looking and checking into why my transmission won't shift into 4th(OD) except when it wants to. 
It'll shift into OD on first startup and start driving when the air temperature is really cool to cold. But after the engine gets to operation temperature and i come to a stop at a light or sign and take off again, it won't shift on up again. 
It will, however, shift up when I disengage the OD, essentially, shifting into gear 3.5. 
Well, I can putt around town and get to where I'm going within a reasonable about of time with a few extra minutes added, I just figure in leaving a little earlier. 
Then, on the hotter days of this year, I'd forget to disengage the OD and it'd shift into 4th and stay there until I came to a stop again. 
As long as I was moving, it wouldn't come out of 4th. 
Even the real cool spell earlier this week, it wouldn't shift into 4th, no matter how much I'd throttle tease it up and let off the gas. 
So, back to gear 3.5. 
At times, it'd shift on it's own to OD when I'm just dinkin' along on low rpms and a slow take off and no hurry. Other times, NOT. 
Getting around at 45-50 isn't so bad as it sure saves on the gas as it'll do 15mpg consistantly in the 1700-1750 rpm range, which is where I try to keep it, unless I've just "got" to be somewhere. 
Thanks again for any and all input of what and where to start looking. 
BTW: had the transmission rebuilt about 70,000 miles ago at 304,000 miles.
It rides real nice and I'd like to take it on road trip as needed. 

You know the model/year, have the vin #.  Go to youtube and google, and ask the same questions.  Lotsa times, the question has been asked, before, and you'll find a video of how to fix the problem. Or the search engines may lead you to clues/symptoms, that lead you in another direction...Wink
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Jim Hancock View Drop Down
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Points: 1112 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Jim Hancock Quote  Post ReplyReply Direct Link To This Post Posted: 04 Aug 2018 at 5:51pm
Shameless, 
I definitely don't do any dinkin' around OKC. Main traffic lights are a mile apart and the traffic doesn't take their time neither. 
Amos, thanks for the starting point to look into. 
Dave, I'll do that. 
How blessed we are by HIS GRACE!
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Lars(wi) View Drop Down
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Points: 8024 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Lars(wi) Quote  Post ReplyReply Direct Link To This Post Posted: 05 Aug 2018 at 9:48am
So if I figure right this truck has 375,000 mi on it?
Is it possible the vacuum is getting weak, and causing the tranny issue?
I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.
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Jim Hancock View Drop Down
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Joined: 11 Sep 2009
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Points: 1112 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Jim Hancock Quote  Post ReplyReply Direct Link To This Post Posted: 11 Aug 2018 at 3:11am
Update: 
My transmission issue has been narrowed down to the PCM not telling the transmission to upshift into OD. 
They cleaned the ground connections first - nope - then serviced it - not that either. 
They did find some brass shavings in the pan when they dropped it to service it. 
Upon checking mileage, it's actually been 62,xxx since 3/2014 when it was totally rebuilt and a new PCM put in. 
It's at 366,4xx miles now. 
My previous number was a guesstimate as best as I could when I initially posted this. 
Sidenote: Ask your question in the address bar - in my case - PCM for a 96 Dodge Ram 1500 - and up popped quite a few result sites for a replacement/repair at very reasonable prices with warranties! Take your pick at the best bang for the buck! 


Edited by Jim Hancock - 11 Aug 2018 at 3:13am
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