Transmission hunting?
10-14-2009, 09:59 PM
#1
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Transmission hunting?
I recently had my transmission replaced. The new transmission hunts consistently at 30mph +/- 5 MPH with the OD disengaged. With the OD engaged it hunts at 45 +/- 3 mph. Is there any way I can stop this? It doesn't shift hard, its just consistent and anouying.
If i change my gear ration will it change the shifting?
If i purchase a mod chip and change shift points will it help to lock in a gear?
Ive been told this is a normal dodge transmission issue and its not a big deal.
If i change my gear ration will it change the shifting?
If i purchase a mod chip and change shift points will it help to lock in a gear?
Ive been told this is a normal dodge transmission issue and its not a big deal.
10-14-2009, 10:16 PM
#2
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Read the T C lock up thread at top of this forum. Since the problem came with the new tranny, I suspect the unit has old solenoids. There was a change through the years that shielded the coils better. The genuine replacements from Dodge are the only ones that know for sure have this. That why they higher cost I guess.
The basic things are cleaning all ground and high power electrical connections. Read the mentined thread.
Me brain dead. that post is on another forum somewhere. There are numerous threads here also. Just do search on O. D. hunting or unlocking. By the way, there is no ""one cure fixes all"" for this condition.
The basic things are cleaning all ground and high power electrical connections. Read the mentined thread.
Me brain dead. that post is on another forum somewhere. There are numerous threads here also. Just do search on O. D. hunting or unlocking. By the way, there is no ""one cure fixes all"" for this condition.
Last edited by dozer12216; 10-14-2009 at 10:22 PM. Reason: add info
10-15-2009, 03:39 PM
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my trans was hunting also. i ending up replacing the lift pump after everything else i tried didnt work. guess what... no more hunting. yippie!!! now i got a cracked block tho.
10-15-2009, 11:38 PM
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My 2000 was doing something similar to what you describe. It seemded to be shifting in an out of forth at it's own will when cruising at a steady speed, usually between 30-40 mph. I did some searches here, then crossed my fingers, then offered my first born and finally reset my APPS. Easy as pie. My truck now shifts better than any automatic 24V I have ever driven, or as if 200K never happened. Cost....$0. I don't know if the APPS reset actually helps more than a small percentage of people with their automatic trans. issues or if I got extremely lucky, but it worked for me.
......(edit).....I guess what I thought was shifting in an out of forth gear was actually the OD engaging and disengaging.
......(edit).....I guess what I thought was shifting in an out of forth gear was actually the OD engaging and disengaging.
Last edited by ARIZONACLASSIC; 10-15-2009 at 11:41 PM. Reason: clarification
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10-16-2009, 06:45 PM
#8
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I got mine from DTT when they did my tranny.
I think they call it a tps filter
However I think several others out there sell something similar.
http://www.dieseltrans.com/dodge/price_list.htm
I think they call it a tps filter
However I think several others out there sell something similar.
http://www.dieseltrans.com/dodge/price_list.htm
10-19-2009, 07:56 AM
#10
Administrator
Before you spend your money, try this free fix.
The effect that is occuring is known as a "ground loop". Ground loop cause unwanted electrical "noise" on electrical and signal lines. The lockup clutch is controlled electrically and a noisy control line will make it "hunt".
http://en.wikipedia.org/wiki/Ground_loop_(electricity)
Dirty connections, corrosion, and loose connections all contribute to ground loop. Fixing it is easy though. Generally involves cleaning ALL ground connections affecting the transmission and controlling it. Batteries, frame connections and the PCM on the firewall all need to be cleaned.
IMO tin foil shielding and power filters are simply band-aids that mask the underlying problem if left unchecked. And like I said before a simple cleaning with a wire brush and a piece of sandpaper will normally fix the problem with the lockup clutch.
Here is one of my posts from another thread involving the same issue.
I had the lockup issue and it immediatly was solved after cleaning the grounds.
The effect that is occuring is known as a "ground loop". Ground loop cause unwanted electrical "noise" on electrical and signal lines. The lockup clutch is controlled electrically and a noisy control line will make it "hunt".
http://en.wikipedia.org/wiki/Ground_loop_(electricity)
Dirty connections, corrosion, and loose connections all contribute to ground loop. Fixing it is easy though. Generally involves cleaning ALL ground connections affecting the transmission and controlling it. Batteries, frame connections and the PCM on the firewall all need to be cleaned.
IMO tin foil shielding and power filters are simply band-aids that mask the underlying problem if left unchecked. And like I said before a simple cleaning with a wire brush and a piece of sandpaper will normally fix the problem with the lockup clutch.
Here is one of my posts from another thread involving the same issue.
Originally Posted by jrs_dodge_diesel
There are 6 key spots to clean. Each negative battery terminal (1,2). There is a wire that runs from each negative battery terminal to the body of the truck with an eye terminal (3,4). Not only did I clean the connector, I took some sandpaper and took the sheet metal to bare metal to give a better electrical connection. The most critical wire to clean is the one on the PCM (Powertrain Control Module) which sits on the firewall, on the passenger side (5,6). The PCM is what controls the lockup clutch. There is a ground wire on it that runs to the firewall. On my truck, I did not like the amount of corrosion I saw on my PCM ground wire, so I replaced it. Made a new one with soldered eye terminals to minimize corrosion. I also sanded the firewall and PCM where the ends connect.
07-13-2021, 04:07 PM
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Tried it, worked for 2 days
I ran a jumper from the battery to the PCM ground on the firewall, cleaned and greased all grounds like the videos told me was “all I need to do”, and my 99 w/148k miles ran like a dream for a couple days. Noticed that the fuel gauge seemed to show alarmingly high fuel consumption, then the tranny resumed its old habit of shifting in and out at all rpm, and now I have a “check engine” light burning. I wondered if this was too simple and good to be true, and it seems it is. I’ve had 2 sensors changed out ($800) and spent $1700 apparently teaching a guy how to find YouTube videos on this problem. So far the truck has beaten all challengers. I’ve exhausted the cheap and easy “fixes” and no relief. But I still love this truck for reasons I can’t explain.
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