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Is it normal for my 1985 GMC Sierra TH350 tranny to shift really early. It will shift into 3rd gear by about 18-23 mph any suggestions

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  • Cars & Trucks Master
  • 450 Answers

No not normal, there is a cable which is located adjacent to the throttle cable, think they call it a detent cable , which can be adjusted , a repair manual by haynes addresses this cable and instructs you how to make adjustment, try this first, or just take to a trans shop for a free test drive.

Posted on Jan 14, 2013

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  • Cars & Trucks Master
  • 75,066 Answers

No this is not normal and may be a governor or other internal issue with the transmission. Have a local transmission rep[air shop test drove it and see what they think, that is in most cases free.

Posted on Jan 14, 2013

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Posted on Jan 02, 2017

hankfan18436
  • 62 Answers

SOURCE: 1990 f150 transmission up shift to early

your modulator valve is unhooked, or bad. The modulator valve is what tells the transmission when to shift and what gear to shift to. It is located on either side of the transmission depending on the model, Im not sure which side your perticular model be on but it looks like a spark advance. I hope that helps you out.

Posted on Nov 18, 2008

  • 202 Answers

SOURCE: 1990 f150 transmission up shift to early

Sounds like the passing gear cable is out of adjustment. Get a shop manual and see what the specs are on how to adjust it properly. It is a pretty simple fix.

Posted on May 27, 2009

  • 16 Answers

SOURCE: 1998 GMC SIErra

Check your transmission. Look underneath the truck and see if you see moisture around the transmission pan. If you see any indication of that, you may have a huge issue on your hands. Your reverse gear is seized to the Drive Gear. However hopefully it's something like needing a new clutch or a clutch adjustment

Posted on Aug 23, 2009

czaa
  • 4514 Answers

SOURCE: 1990 Nissan 300zx w/ shifting issue

well Im sure theres a ton of miles on it-do u perform reg maint like checkin fluid level-u may need the throttle cable ajusted that hooks to trans-band n clutch could be out of measure too--trans hydra-valve system could be worn--see all these things effect the way the fluid makes the gears move--a pressure test can confirm an aging trans

Posted on Sep 19, 2009

  • 43 Answers

SOURCE: Transmission jerks on 1985 Crown Vic when cold.

Unless you are low on fluid, I suspect you are in need of a rebuild. I have had similar problems before. Any shop will tell you to try a fluid and filter change. It has never brought one of mine back. I would suggest adding fluid to the top of the 'add fluid' area of the dipstick and no more. It can foam if it is to full, causing similar problems as being to low. I would add that if you have to replace the transmission - you need to consider that the car may not be worth the cost.
Good Luck.

Posted on Nov 25, 2010

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