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1989 Nissan Truck High RPM, delayed shifting

Tiny
RLLHENRY
  • MEMBER
  • 1989 NISSAN TRUCK
Transmission problem
1989 Nissan D21 Pickup 6 cyl-3.0L Two Wheel Drive Automatic Transmission - L4N71B 89000 miles

The transmission is shifting throiugh all four gears but, at very high RPM's which causes the vehicle to jerk as the shift is completed. The fluid and the filter has been recently changed and no leaks appear.
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Thursday, March 20th, 2008 AT 4:37 PM

8 Replies

Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
WHAT MODEL TRUCK AND WHAT SIZE ENGINE? GET BACK TO ME AND ILL RESEARCH IT.
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Friday, March 21st, 2008 AT 11:03 AM
Tiny
RLLHENRY
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  • 5 POSTS
1989 D21 Nissan Pickup, 3.0L - Automatic (type) L4N71B
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Friday, March 21st, 2008 AT 11:52 AM
Tiny
MASTERTECHTIM
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I found that there is a bulletin for this only when cold, you replace the fluid with a special fluid, but this is only when cold. Also the other thing I found is the governor(controls shift points and is located in the tailshaft housing.) I would suggest having a transmission repair shop road test for you. I was hoping I was going to find a vacuum controlled modulator valve, but you dont have one. Hope this helps
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Friday, March 21st, 2008 AT 12:01 PM
Tiny
MASTERTECHTIM
  • MECHANIC
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https://www.2carpros.com/forum/automotive_pictures/139033_gov_1.jpg

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Friday, March 21st, 2008 AT 12:13 PM
Tiny
RLLHENRY
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  • 5 POSTS
I, m going to try replacing the modulator because I found tranny fluid in the tube.
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Friday, March 21st, 2008 AT 12:14 PM
Tiny
RLLHENRY
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I Checked the modulator that was located on the drivers side of the transmission, A little bugger to get to. Modulator Okay. I then followed the vacuum line to the intake and realized that the vacuum line was deteriorated and needed to be replaced. What can you expect for such an old girl. Runs sweet. Next time when you guys receive a donation, try researching the problem a little closer.
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Saturday, March 22nd, 2008 AT 3:11 PM
Tiny
MASTERTECHTIM
  • MECHANIC
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Noone is perfect. For as many questions we answer each day, we all try our best. If you read my post one of the first things I suggested was the modulator valve but the information you gave me showed the transmission to have a governor not a modulator valve. Im not claiming I have a crystal ball and can see your truck. I did take the time to look up your vehicle and research your problem. There is only so much we can do. I did give you a honest effort.
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Saturday, March 22nd, 2008 AT 6:48 PM
Tiny
RLLHENRY
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Just a quick note on the site that I found my information for the transmission. USATRANSDOCTOR. COM
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Sunday, March 23rd, 2008 AT 8:21 AM

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