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Old 04-21-2018, 05:19 PM   #1 (permalink)
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Noisier than usual Atlas?

Just got a 3.8:1 Atlas 2 speed installed in my truck and I know gear driven transfer cases are noisier than chain but this seems a little excessive. It is clocked at 39ish degrees, cable shifters, filled with 2 quarts of Red Line 75/90 synthetic (what AA sent) and the rear driveline was just serviced. On the freeway, coasting is quieter but noisier when I'm on the gas but around town its the opposite, on the gas is quieter than coasting. Maybe thicker gear oil would help? If its normal, I guess I will pile up sound deadener on the floor to cut down on cab noise because I can't even talk to my passengers. Drives just fine at 70+mph down the freeway, no different than before, no vibes either.

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Old 04-21-2018, 07:47 PM   #2 (permalink)
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Old 04-21-2018, 08:08 PM   #3 (permalink)
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I'm aware, just want to make sure something isn't gonna blow up
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Old 04-21-2018, 08:20 PM   #4 (permalink)
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I'm aware, just want to make sure something isn't gonna blow up
again ... #racepartsgetyouracecarresults #iwaswinninguntiliwasnt
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Old 04-21-2018, 09:08 PM   #5 (permalink)
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Take an oil sample and check for metal. Difficult to diagnose drivetrain noises on the internet.
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Old 04-21-2018, 09:44 PM   #6 (permalink)
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I think AA says to put 500 miles on the case, then do an oil change. My oil was pretty dirty after the first change. Been staying cleanish since the change. Maybe things just need to get seated in and it'll get better.
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Old 04-21-2018, 09:57 PM   #7 (permalink)
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To be clear, it's not noisier than usual (as in a new development) it's just noisier than your toy cases were? What all did you change? Mounts, holes for shifters/ cables, etc. There are likely more wheels in motion than the case itself making noise.
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Old 04-22-2018, 09:14 AM   #8 (permalink)
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I can’t say that I have ever had noise from an atlas driving down the road. I still have # 375 from 1998 that does not make noise. I would look to drive line or rear axle.
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Old 04-22-2018, 09:25 AM   #9 (permalink)
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Old 04-22-2018, 09:25 AM   #10 (permalink)
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To be clear, it's not noisier than usual (as in a new development) it's just noisier than your toy cases were? What all did you change? Mounts, holes for shifters/ cables, etc. There are likely more wheels in motion than the case itself making noise.
Its certainly noisier than the chain driven case and I expected it to be louder but this seems excessive especially since some people have silent Atlas'.

Edit: Mount changed, I only have a TMR rear output mount and the motor mounts holding the drivetrain up. Holes for the shifters have been patched with 12 gauge sheet and 1/8" thick neoprene so there aren't anymore holes in the floor than there were before. I did have one small section open where the Atlas cables came through the floor that was open and the noise was so loud you couldn't hear anything inside the cab because of the gear rattle in the Atlas.
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Last edited by generalee7; 04-22-2018 at 09:29 AM.
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Old 04-22-2018, 12:50 PM   #11 (permalink)
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Damn I didn't think Atlas' were way more sensitive to driveline angles than chain drive cases. I had installed 1" center support bearing spacers in the rear driveshaft 4 years ago when I built the truck to help with angles and vibrations but never really noticed a difference in using them. I pulled those spacers out to help with the angle at the t-case and its 100x quieter now, sounds like a gear driven case should I think. Maybe the further you get from 90* to the t-case output, the more the u-joint travels from fast to slow and the more the Atlas doesn't like it. Carry on folks..

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Old 04-22-2018, 02:29 PM   #12 (permalink)
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Old 04-22-2018, 09:14 PM   #13 (permalink)
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My carrier besring setups have always sang
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Old 04-22-2018, 10:52 PM   #14 (permalink)
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Unless your going down the road in 4WD the chain versus gear to gear really should not be up for debate. Now when you swapped out the TC and you changed driveline angle / length then it’s hard to pin it to the TC. Very Minor changes can make a big difference with noise and vibration. Science doesn’t apply to wheeling rigs. Throw some shims or spacer in somewhere and see if it makes a difference. In the past I have rebuilt the trans, drive line and TC chasing a funny noise. Ended up being a bad pinion bearing that you could not feel by hand.
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Old 04-24-2018, 05:23 PM   #15 (permalink)
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x2 on the dshaft angles. When my build was new I had the rear pinion cranked way up and it got the atlas angry. called Atlas and I thought they were blowing me off but no, it fixed it.
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