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Anonymous Posted on Feb 09, 2013

My 1985 GMC Sierra TH350 trannys. The speedometer isn't working but will ping sometimes. I have no idea what it is so anybody please help

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Ed Adams

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  • Expert 128 Answers
  • Posted on Feb 09, 2013
Ed Adams
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The gear that is in the adapter for the transmission is plastic and they would strip out, easy fix and cheap too

If you need further help, I’m available over the phone at https://www.6ya.com/expert/edward_020b3320326d263d

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astrawoid

Eric Cross

  • 294 Answers
  • Posted on Dec 10, 2010

SOURCE: can I replace my 700r4 in my 1992 GMC Sierra with

I did, but I had to exchange the drive shaft b/c the length was wrong. the R4 has OD, and the 350 does not, making the 350 shorter. It's no a great idea. I was unhappy with the 3 speed 350 because of very poor gas mileage, so I went back to the r4. I had a bit of an issue with the speedo cable and the tranny crossmember mount too. It's not really worth it, but yes, you can do it, but it's going to take fab work, and after my own ordeal, I'd not really suggest it. I was just trying to save a few bucks, and got myself into a world of hurt. lol you live , you learn. Unfortunately Fixya did not exist back then.

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ken hane

  • 450 Answers
  • Posted on Jan 14, 2013

SOURCE: 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

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.

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