My Overdrive seems Underdriven - Second Generation Nissan Xterra Forums (2005+)
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post #1 of 9 (permalink) Old 05-16-2019, 09:34 PM Thread Starter
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My Overdrive seems Underdriven

I’m on my second Extera, first one was an ‘04, this one is an ‘07 with 152,000 miles, both are automatics, my overdrive gear was slipping in and out of neutral, I can’t check the trans fluid due to it’s a sealed unit, anyone hear of this and is there a solution or is my tranny fried, I can still drive it with the overdrive switched off,
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post #2 of 9 (permalink) Old 05-16-2019, 09:38 PM
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This post is odd, but if you do have an automatic 2007 Xterra, then you do not have a sealed transmission. Bring it to a shop and have them take a look.
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post #3 of 9 (permalink) Old 05-16-2019, 10:33 PM Thread Starter
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There’s a cap on the dipstick tube so there’s no dipstick and it appears factory looking I took it to a garage and they said it appears to be an internal mechanical problem, I’m going to the dealer to get a second opinion
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post #4 of 9 (permalink) Old 05-16-2019, 11:42 PM
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Take the bolt out, pull on that cap. Its a dipstick.
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post #5 of 9 (permalink) Old 05-17-2019, 12:07 AM
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The Extera might not have a dipstick but the Xterra does.
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post #6 of 9 (permalink) Old 05-17-2019, 12:15 AM
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Originally Posted by satown210 View Post
The Extera might not have a dipstick but the Xterra does.
Easy fellas,.. English is obviously not his native language.

I hope he does not have the feared SMOD

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post #7 of 9 (permalink) Old 05-17-2019, 12:52 AM
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If it shifting except for OD I'd imagine that he has a mechanical or electrical issue. 152K, unknown maint or towing. I could see it failing.....
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post #8 of 9 (permalink) Old 05-17-2019, 08:33 AM
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I can still drive it with the overdrive switched off,
Would you describe it as "hunting" or "fluttery" when it's trying to shift up into overdrive? It sounds a lot like what I saw recently. Hit the O/D Off button and it behaved just fine locked at 4th.

First, like others mentioned, check the dipstick. You need a 10mm socket and extension to get it open, make sure you turn the bolt ring 180 to the front for a good reading. You need to check it running, warmed up, and on pretty flat ground. Check the level and condition. (SMOD)

Get a copy of the FSM. FWD.pdf is the index.

Find @Mr.Bills post on SMOD radiator part numbers and compare yours to it.

I can't tell you what's wrong with yours, but the 06 trans controller in the attached pics had similar O/D symptoms and is now running much smoother with new solenoids. I also scrubbed the corrosion off the traces with an old tooth brush, but none of the leads to the solenoids needed repair. (Some here have soldered splints with good luck.)

It took me 2 days to complete at my slow pace but was only about 4-5 hours of actual labor. The original solenoids went about 190k miles. Shifts fairly firm and quick now.

With luck yours may just be a bit low on fluid.
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post #9 of 9 (permalink) Old 05-17-2019, 10:41 AM
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Im going to bookmark this thread for future reference. I can never stare just how helpful everyone is here.

OP, I hope everything turns out alright with your transmission.
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