Re: 2007 Ram 1500 lost OD today.
[Re: Kern Dog]
#2041650
03/30/16 01:29 AM
03/30/16 01:29 AM
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Joined: Feb 2010
Posts: 18,493 Granite Bay CA
Kern Dog
OP
Striving for excellence
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OP
Striving for excellence
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
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Strange thing: It happened again today. I started the truck after work and a few miles down the road at a stoplight, it started off in 2nd gear. At 55 or so, I noticed that it didn't upshift to OD. I stopped to check the fluid level and it was right in the correct spot. Fluid is clear red and smells new. My commute is 92 miles each way and I knew without OD I'd need to get gas to make it home. I shut it down and restarted after refueling. Afterwards, the transmission was back to normal. I never got a MIL, no codes, nothing. It is odd that a restart somehow reset "the clock" or however you'd describe it. At times the truck has felt like it starts in 2nd gear. This has been since the first year that I've owned it. I'm at 260,000 miles and aside from regular fluid and filter service, the transmission is original. I called a local wrecking yard. They have 8 of these 545 series units in stock ranging from $375 to $1050. The most expensive one came from a 19,000 mile truck.
Last edited by Frankenduster; 03/30/16 01:30 AM.
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Re: 2007 Ram 1500 lost OD today.
[Re: Kern Dog]
#2041711
03/30/16 03:49 AM
03/30/16 03:49 AM
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Joined: Aug 2005
Posts: 6,018 Salem
Grizzly
Moparts Proctologist
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Moparts Proctologist
Joined: Aug 2005
Posts: 6,018
Salem
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They don't go into od until 67 mph.
Mo' Farts
Moderated by "tbagger".
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Re: 2007 Ram 1500 lost OD today.
[Re: Kern Dog]
#2042239
03/30/16 08:57 PM
03/30/16 08:57 PM
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Joined: Dec 2014
Posts: 5,954 ohio
ruderunner
master
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master
Joined: Dec 2014
Posts: 5,954
ohio
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Checking in neutral? Not sure if the newer trans are still like that.
Angry white pureblood male
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Re: 2007 Ram 1500 lost OD today.
[Re: Kern Dog]
#2042649
03/31/16 12:35 PM
03/31/16 12:35 PM
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Joined: Aug 2005
Posts: 6,018 Salem
Grizzly
Moparts Proctologist
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Moparts Proctologist
Joined: Aug 2005
Posts: 6,018
Salem
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What gears/tires do you have and what rpm are you at 60mph?
Mo' Farts
Moderated by "tbagger".
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Re: 2007 Ram 1500 lost OD today.
[Re: Kern Dog]
#2044017
04/01/16 11:45 PM
04/01/16 11:45 PM
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Joined: Aug 2005
Posts: 6,018 Salem
Grizzly
Moparts Proctologist
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Moparts Proctologist
Joined: Aug 2005
Posts: 6,018
Salem
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Yep, just wanted to make sure 'cause these things are double-overdrive. Sure like to know why the heck I have to wind my '07 up to 67 mph to get top gear? Every time, makes no difference. Otherwise it will stay in od 1 at 2000 and burns fuel like no tommorow. Get it into od 2 and it's 1600 rpm and mileage goes way up. Even has it listed as 67 in Superchips advanced transmission stock tables.
Mo' Farts
Moderated by "tbagger".
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Re: 2007 Ram 1500 lost OD today.
[Re: buildanother]
#2044136
04/02/16 01:59 AM
04/02/16 01:59 AM
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Joined: Feb 2010
Posts: 18,493 Granite Bay CA
Kern Dog
OP
Striving for excellence
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OP
Striving for excellence
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
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From Wikepedia:
Basic RFE operation[edit] The fully electronic control is accomplished by the Transmission Control Module (TCM). Depending on year and application, it can either be a stand-alone module or integrated with the Powertrain Control Module (PCM). The TCM uses data from various transmission and engine sensors to control transmission shifting. The transmission operates the solenoid pack to change hydraulic flow through the valve body to various clutches in the transmission. The solenoid pack is mounted directly to the valve body; its connector protrudes from a hole on the left side of the transmission. On the 45 and 545RFE the hydraulic control system design (without electronic assist) provides the transmission with PARK, REVERSE, NEUTRAL, SECOND, and THIRD gears, based solely on driver shift lever selection. This design allows the vehicle to be driven (in “limp-in” mode) in the event of an electronic control system failure, or a situation that the Transmission Control Module (TCM) recognizes as potentially damaging to the transmission. On the 68RFE, fourth gear is used for limp-in instead of second and third.
This might explain things. If the trans is designed to still operate in reverse, 2nd and 3rd in the event of an electronic system failure then I must have an electrical gremlin. The truck did feel like it lost first and overdrive. I did not know until today that it IS double overdrive with a 4th gear .75 and a 5th of .67.
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Re: 2007 Ram 1500 lost OD today.
[Re: Kern Dog]
#2044139
04/02/16 02:03 AM
04/02/16 02:03 AM
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Joined: Aug 2005
Posts: 6,018 Salem
Grizzly
Moparts Proctologist
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Moparts Proctologist
Joined: Aug 2005
Posts: 6,018
Salem
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It's confusing, it has a first, two seconds, a third, then two overdrives. At some point they just went from calling it the 545rfe to a 6 speed up until the 8 speed was made available.
At any rate, it's worlds better than the RE I have in my '01.
Trying to adjust mine with a Superchips Cortex I bought, but having some programming issues with Superchips at the moment......
Mo' Farts
Moderated by "tbagger".
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Re: 2007 Ram 1500 lost OD today.
[Re: Kern Dog]
#2072861
05/13/16 08:23 PM
05/13/16 08:23 PM
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Joined: Jan 2004
Posts: 9,066 Eugene, Oregon
minivan
master
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master
Joined: Jan 2004
Posts: 9,066
Eugene, Oregon
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I've always looked at automatic transmissions like "voodoo science" but this was a nice victory.
With you on that one but my thinking is more like " Past here Thar be dragons ".... LOL .......
Last edited by minivan; 05/13/16 08:24 PM.
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