48re buzzing when coasting and downshift - Dodge Cummins Diesel Forum
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post #1 of 8 (permalink) Old 01-20-2019, 04:19 PM Thread Starter
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48re buzzing when coasting and downshift

I swapped my 48re with a Firepunk Towmaster 3 years ago and everything went fine. Lately I have started hearing a buzz when downshifting 2-1 and especially when coasting into turns. Also have code P1740. I have replaced solenoid and governor. Now I’m getting ready to start swapping throttle body parts. Thought I would search for advice first.....also would any pics and/or diagrams of what the throttle plunger/ control arm should look like. 04.5 3500 48re with Cable Throttle control (non Electronic TVA). Thanks.


2004.5 Dodge 3500 SLT High Output Turbo Diesel
AFE Stage II Intake Magna Flo 5" Exhaust
Edge Juice w/ Attitude programmer
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post #2 of 8 (permalink) Old 01-20-2019, 04:34 PM
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IMO, best to go thru diagnostics rather then just throwing parts at it

See

https://www.cumminsforum.com/forum/3...639-p1740.html

04 QCSB HO Automatic
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post #3 of 8 (permalink) Old 01-20-2019, 07:23 PM
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Worn pump, valve body issue or faulty overrunning clutch. Check line pressure, inspect valve body for wear or loose bolts. For overrunning clutch you need to disassemble the transmission. This last one would be my bet.
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post #4 of 8 (permalink) Old 01-20-2019, 07:41 PM
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talk to firepunk who made your trans and ask.....
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post #5 of 8 (permalink) Old 01-20-2019, 09:15 PM
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Quote:
Originally Posted by smokestack69 View Post
talk to firepunk who made your trans and ask.....
What he said.

2007 Ram 2500 crew cab, long bed, 4x4 5.9L, Firepunk EFI live and Towmaster 48re, Straight piped muffler, 2um Cat filter 10um water, separator on frame rail. Steering box brace
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post #6 of 8 (permalink) Old 04-17-2019, 05:08 PM Thread Starter
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???Solved???

????Solved????
Alright, so I looked over the diagnostic list and saw that a potential cause was restricted fluid lines. And lo and behold the rear hard cooler line was kinked at the fitting. Probably from when we swapped out the tranny. So I replaced the cooler line a couple weeks ago. Took it for a test drive and no improvement on the noise.... Then, this past weekend, I was out of town so she sat in the driveway. Then I hop in on Tuesday to go to work and no buzzing noise. I thought maybe it would come back but 2 days and no noise. I just took it hot rodding around the block a few times to check it out and still no noise. So, maybe its fixed. I have not tried to erase the code yet. My question is does this seem like a feasible action and result? Also, can anybody give me a little information regarding the direction and action on the fluid as it travels to and from the cooler? So that I could wrap my head around what I was experiencing and how I was able to fix it? Thank you all for your responses...

2004.5 Dodge 3500 SLT High Output Turbo Diesel
AFE Stage II Intake Magna Flo 5" Exhaust
Edge Juice w/ Attitude programmer
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post #7 of 8 (permalink) Old 04-17-2019, 06:37 PM
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Hopefully that was it !!
Search on here for "newbies guide" FSM and ATSG available showing fluid flow diagrams, also Sonnax has some good info here https://www.sonnax.com/tech_resource...tures-revealed

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post #8 of 8 (permalink) Old 04-30-2019, 07:46 PM Thread Starter
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Talking Solved

So it looks like that was it......restricted fluid line. After looking at the schematic, what I can figure is that the return line was restricted causing the fluid to drain slow from the TC and causing the RPMs to not drop as fast as the computer wanted causing the code and the buzzing. I'm not sure what exactly was physically causing the buzzing. Perhaps it was from the plates in the TC not being free when they should or maybe fluid turbulence, but not likely. At any rate, the noise is gone, truck is running great. But the code.....is stuck on there. I can't get the cheap-o reader to erase it. oh well. dont bother me nun. until my next smog that is...

2004.5 Dodge 3500 SLT High Output Turbo Diesel
AFE Stage II Intake Magna Flo 5" Exhaust
Edge Juice w/ Attitude programmer
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