M205 Diff - Feels like Parking Brake on in 4WD - Second Generation Nissan Xterra Forums (2005+)
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post #1 of 23 (permalink) Old 03-05-2017, 03:51 AM Thread Starter
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Question M205 Diff - Feels like Parking Brake on in 4WD

Sry for all the problem threads, just want to make sure I have everything correct since I'm first time. I thought Titan swap was going to be an "easy, bolt-on application" lol. Hopefully this is my last question...


So I fixed my ABS problem today and was finally able to switch to 4WD with the new (used 2012 with 54k miles) M205 diff. I switched to 4-hi in our gravel driveway. Here is what happened:
  • Both forwards and backwards, going in a straight line, it felt like the parking brake was pulled hard. It took a decent amount of effort to move the truck.
  • While the truck was moving in 4wd, the front wheels were "chirping" on the gravel every few feet.
  • I switched out of 4-hi and back in, and tried this again both forward and reverse. Same results.

I only went 6 or 7mph and for about 30 feet or so. This happens both in drive and reverse. I didn't try anything more substantial cus I didn't want to blow the diff if something was wrong.

Here is what I know so far:
  • This DOES NOT happen in 2wd and the truck rolls just fine.
  • I did a max-braking test from about 35mph to stop and the truck didn't pull to either side so I don't think it has anything to do with brakes.
  • The diff is properly bolted into the truck (pretty hard to mess that up), I reattached the breather tube, and it definitely has diff fluid.


Any ideas?

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Last edited by AlbatrossCafe; 03-05-2017 at 03:55 AM.
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post #2 of 23 (permalink) Old 03-05-2017, 04:40 AM
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Do you have the correct/matching gearing to match the rear? Sounds like you might have different gears front vs. rear. Though I'm no expert.

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post #3 of 23 (permalink) Old 03-05-2017, 04:51 AM Thread Starter
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Originally Posted by npgtech View Post
Do you have the correct/matching gearing to match the rear? Sounds like you might have different gears front vs. rear. Though I'm no expert.
Good point. This would REALLY be frustrating if this is the case. I definitely bought 3.36 which matches my PRO-4x A/T rear. Whether or not LKQ junkyard actually gave me the correct one is another story. Do you know if there is a stamp or something on the housing that I can check?

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post #4 of 23 (permalink) Old 03-05-2017, 04:58 AM
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I'm not a 100%, but I think there is a post somewhere here TNX that might have that info. There is also a way to tell by the rotations of the output shafts vs the drive shaft input, that is somewhere here on TNX as well.
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post #5 of 23 (permalink) Old 03-05-2017, 07:54 AM
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Just asking, you weren't trying to turn while in 4wd were you?
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post #6 of 23 (permalink) Old 03-05-2017, 08:13 AM
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M205 diff - feels like parking brake on in 4WD

Sounds like it's not the right gear ratio. That's what is does when they are mis-matched. Did you check the ratio stamped on the ring gear before installing? The tooth count for the ring and pinion will be stamped on there.

Edit, if you didn't, jack up just one front tire and rotate it exactly one turn. Watch the driveshaft. If it turns exactly 3 times (or just a fuzz less), you have the 2.94 gear ratio. If it turns over 3 times (3 - 1/3 rotations) you have the 3.36 ratio.
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Last edited by jsexton; 03-05-2017 at 08:16 AM.
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post #7 of 23 (permalink) Old 03-05-2017, 10:54 AM
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I'm betting wrong gear ratio


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post #8 of 23 (permalink) Old 03-05-2017, 11:04 AM
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You got the wrong gear ratio bud.

Bummer. Always check first before bolting it all together. Junk yards screw up a lot.


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post #9 of 23 (permalink) Old 03-05-2017, 11:04 AM
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It is the wrong ratio, no need to further test it. I would look into either pulling both CVs or the front driveline to prevent un-needed wear in the transfercase with the drivelines spinning at different speeds.

You were probably able to move a few feet first and it started to bind up. Same thing happened to me years back when I bought a rear axle assembly from an "auto recycler" for my last rig.


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Last edited by Snowtrout; 03-05-2017 at 11:14 AM.
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post #10 of 23 (permalink) Old 03-05-2017, 12:30 PM Thread Starter
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Quote:
Originally Posted by Snowtrout View Post
I would look into either pulling both CVs or the front driveline to prevent un-needed wear in the transfercase with the drivelines spinning at different speeds.

You were probably able to move a few feet first and it started to bind up.
Yep, that sounds correct.

Damn. So even in 2WD it can still damage the transfer case? Or what do you mean by "un-needed wear"? I've probably driven 200 miles or so on it already. I hope that didn't hurt anything.

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