Auto Transmission Clunk when shifting from reverse to drive

MadDog89 · 05-05-2022, 02:45 PM

Not sure if normal, but when I shift from reverse to drive there's a pretty hard thud, seems like it's coming from the rear. With my windows down and near a wall it sound rather metallic. Just one single thud. What's the most common reason?

MadDog89 · 05-05-2022, 07:42 PM

Here's the video

iqraceworks · 05-06-2022, 06:58 AM

When's the last time you have serviced the transmission....new filter pan, fluid, sleeve seals, double D seal, and shift solenoids? I would try that first.....if that doesn't fix it, you might need to pull the valve body and install one of those Zip Kits........the plungers in the valve body and stick or leak and cause hard shifting. Search online...lots of info out there on it.

MadDog89 · 05-09-2022, 08:46 PM

Quote:

Originally Posted by iqraceworks

When's the last time you have serviced the transmission....new filter pan, fluid, sleeve seals, double D seal, and shift solenoids? I would try that first.....if that doesn't fix it, you might need to pull the valve body and install one of those Zip Kits........the plungers in the valve body and stick or leak and cause hard shifting. Search online...lots of info out there on it.

I serviced the transmission recently, it shift just fine. Clunk is coming from the drive shaft rear diff area. You can see the shaft move when switching between Park to Drive and then hear the metal sounding clunk. Searching did not really come up with much. Some suggesting center support bearing or the flex plate. But with flex plate I'd expect other symptoms besides just a clunk. While others suggest its completely normal

iqraceworks · 05-10-2022, 08:54 AM

Sounds like you just need to jack up the car, get under it, and start wiggling stuff and seeing where the slop is. Sometimes you just need to dive in and find the problem.

ro881e · 05-10-2022, 09:02 AM

Mine does something similat when shifting from D to R, perhaps more of a thud on mine though. Local specialist told me it's likely the drive shaft centre bearing. It didn't seem terminal hence I have left it for now, so can't confirm, but certainly plausible.

iqraceworks · 05-10-2022, 09:04 AM

If it was me....I would look into the actual U-JOINT at the center bearing area....see if it's got any slop it in. That's the part that takes the most abuse.

Also.... when's the last time you have checked/changed your diff fluid? Low/thin uid could be making the gear slop sound worse than it is.

05-05-2022, 02:45 PM	#1
MadDog89 Second Lieutenant 52 Rep 250 Posts Drives: 2007 335i E92 Join Date: Apr 2019 Location: California iTrader: (0)	Auto Transmission Clunk when shifting from reverse to drive Not sure if normal, but when I shift from reverse to drive there's a pretty hard thud, seems like it's coming from the rear. With my windows down and near a wall it sound rather metallic. Just one single thud. What's the most common reason? __________________ 2007 335i 17T EBAY Turbos, FBO, Stage 2 LPFP, Index 12 Injectors, 2 Step Colder Plugs, OEM Coils
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05-05-2022, 07:42 PM	#2
MadDog89 Second Lieutenant 52 Rep 250 Posts Drives: 2007 335i E92 Join Date: Apr 2019 Location: California iTrader: (0)	Here's the video
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05-06-2022, 06:58 AM	#3
iqraceworks Brigadier General 2001 Rep 3,731 Posts Drives: 2007 335i Join Date: Aug 2019 Location: Missouri iTrader: (0)	When's the last time you have serviced the transmission....new filter pan, fluid, sleeve seals, double D seal, and shift solenoids? I would try that first.....if that doesn't fix it, you might need to pull the valve body and install one of those Zip Kits........the plungers in the valve body and stick or leak and cause hard shifting. Search online...lots of info out there on it. __________________ 2007 335i, BMS DCI, BMS Chargepipe w/Tial BOV, ARM Catless Downpipes, silicone inlets, Bilstein B12 Prokit Suspension, Whiteline subframe bushings, Front/Rear M3 control arms, G-Plus FMIC, Stage 2 LPFP, Custom E40 tune by Justin (V8Bait), xHP stage 3 transmission flash, RB Two Turbos....10.90 @ 128mph
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05-10-2022, 08:54 AM	#5
iqraceworks Brigadier General 2001 Rep 3,731 Posts Drives: 2007 335i Join Date: Aug 2019 Location: Missouri iTrader: (0)	Sounds like you just need to jack up the car, get under it, and start wiggling stuff and seeing where the slop is. Sometimes you just need to dive in and find the problem.
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05-10-2022, 09:02 AM	#6
ro881e Private 37 Rep 98 Posts Drives: E90 330i N52 2007 M-Sport Join Date: Jul 2020 Location: Cambridge, UK iTrader: (0)	Mine does something similat when shifting from D to R, perhaps more of a thud on mine though. Local specialist told me it's likely the drive shaft centre bearing. It didn't seem terminal hence I have left it for now, so can't confirm, but certainly plausible.
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05-10-2022, 09:04 AM	#7
iqraceworks Brigadier General 2001 Rep 3,731 Posts Drives: 2007 335i Join Date: Aug 2019 Location: Missouri iTrader: (0)	If it was me....I would look into the actual U-JOINT at the center bearing area....see if it's got any slop it in. That's the part that takes the most abuse. Also.... when's the last time you have checked/changed your diff fluid? Low/thin uid could be making the gear slop sound worse than it is.
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