transmission making a roaring noise in first gear - Chevy and GMC Duramax Diesel Forum
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post #1 of 9 (permalink) Old 11-13-2011, 06:54 PM Thread Starter
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Angry transmission making a roaring noise in first gear

working on a 2001 gmc serria 6.6 2500hd allison auto trany ......ok so i got in my truck this morning and backed it up and put it in gear and roar roar roar even worse when i let off the gas truck has a lot of miles on it like 389,000 but all the gears work fine and dont slip sifts realy good just makes this noise .... only in first and gets louder when u let off the gas pedel ....... so this is what i have done i pulled the drive shaft put the truck in 1st and climed under it roar roar bad sound comming from the back of the trany sounds like a rear diff when the bearings are bad

2011 chevy 3500 lml
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post #2 of 9 (permalink) Old 11-13-2011, 07:17 PM
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Just a stab in the dark. 4WD? Maybe Transfer case? Check fluid in T-Case. I've heard funky sounds from bad T-cases. I'm ASSuming you already checked Tranny fluid and it's at proper level and good, not burnt.

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post #3 of 9 (permalink) Old 11-13-2011, 07:20 PM Thread Starter
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fluid good and its 2wd

2011 chevy 3500 lml
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post #4 of 9 (permalink) Old 01-11-2012, 03:40 PM
 
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Im having this same issue. It just started yesterday, i searched and searched and haven't found anything yet. I hear the same roaring noise in D first through 2nd, then when it shift to 3rd it goes away. Happened to me on my way home from work. So i pulled the ING0 fuse forcing the tranny into "limp mode" and did just that limped home.

I have changed the Fluid and filter, fluid was a lil dark but wasn't burnt, then took the truck out on a test drive and same issue. Truck shifts fine no slipping or hard shifting, but by way of the noise i KNOW something isn't right. I have a OBDII scanner but the tranny isn't throwing any codes. the only code i have is a P0540 which is Intake Air heater circuit.

Many people are suggesting the transfer case but I have ruled that out because...

-1 when I pulled the fuse which removed power from the TCM and the truck remained in "limp mode" (3rd gear) I never heard the noise, so therefor im assuming its a transmission problem between 1st and 2nd.

-2 I rebuild my tcase 2 months ago, and have since put 6,000 miles on it since then

Im going to try and make a vid and post it, but any help would be greatly appreciated


truck is a 2004 LB7, CCSB, 4in exhaust
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post #5 of 9 (permalink) Old 09-08-2015, 08:23 PM
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Hey did you ever get anywhere on this? I am having a similar problem with my truck only it's loud in second, but also makes a lighter noise in first and reverse. Same thing, shifts great, no burned fluid, no slippage.......no clue.

05 2500HD LT E.C. S.B Meyer Super V2 8.5
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post #6 of 9 (permalink) Old 09-08-2015, 09:00 PM Thread Starter
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Yes The planetary gears was busted pan was full of shavings put new transmission in truck done fine traded truck in at 425000 miles
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post #7 of 9 (permalink) Old 09-10-2015, 11:48 AM
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Dammit!

05 2500HD LT E.C. S.B Meyer Super V2 8.5
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post #8 of 9 (permalink) Old 09-10-2015, 09:49 PM
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Pull the pan on any grinding noise coming from tranny. Will allison makes a grinding noise 99 percent is the planitary gears.

Are you happy now Dukcaln?

2008 GMC 2500 Pewter Lmm
20in fuel rims/ CAT fuel filter/ Deleted/ pcv reroute/ DSP5 EFI LIVE by Jason Rowl/ flopro 4in exhaust/ egr blocker plate/ transgo jr./ allison deep pan/ amsoil filter bypass w/ madjackracing mount
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post #9 of 9 (permalink) Old 09-11-2015, 05:34 AM
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so should I just throw it in a lake and get a rebuilt unit?
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