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I have a 1978 Chevy pickup truck c-10 305 engine and I have all gears but when I drive it stay in low gear like over drive what do you think is wrong

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  • 6 Answers

Tranny is gone, but first check the transmission oil level

Posted on Apr 03, 2015

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  • Chevrolet Master
  • 41,407 Answers

Think you need a rebuild job done.

Posted on Apr 03, 2015

  • fred alliy Apr 03, 2015

    Thanks anything else I can try first

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 1993 Chevy 1500 pickup 4-wheel drive

I replaced the malfunctioning “thermal actuator” with the “Warn” Vacuum actuator setup, it’s been working great for about 7 years now, simple install, if I remember correctly, it was about $150.
That’s what engages the front diff into 4wd.

Posted on Nov 25, 2008

  • 109 Answers

SOURCE: 1978 chevy k20 4x4 truck

try checking your vacume lines..

Posted on Dec 02, 2008

  • 7 Answers

SOURCE: truck will not go into 4 wheel drive

it sound like it is going in to 4low rang but it may only be low 2wheel power brake it a little on dirt if the tires sin in the rear it was only low ranged 2 wheel u can get this by putting it in 4low and unlocking the hubs it may be a hub prob as it is common

Posted on Dec 06, 2009

dennymulford
  • 1055 Answers

SOURCE: 1978 Chevy pickup four wheel drive shifter will

linkage is bent or fork is broke in transfer case

Posted on Feb 24, 2010

  • 880 Answers

SOURCE: Reverse went out on 1978 Chevy pickup

Nothing. Also it will be much cheaper to find a used matching transmission with low (less than 80k miles) than having a shop rebuild the old one. In most cases the used transmission will far outlast the rebuilt one. Check on the web by Googling "used transmissions".

Posted on May 04, 2010

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I have a 1978, 2wd, old chevy pickup with a 305 engine in it. It has a automatic transmission. It recently has not been wanting to shift into reverse. Any help?


I'm assuming that you checked the fluid and it's full. If the fluid was low and you had to top it up, did you run the tranny through the gears, stopping at each gear for a couple seconds? Do this a couple times, down and up. When was the last time you changed the fluid and filter, every 80-100,000 miles.
Check that the vacuum is good to the modulator valve, round thing at top rear on passenger side of transmission. Remove it and tip it down, if any oil comes out replace it.
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2 Answers

Reverse went out on 1978 Chevy pickup


Nothing. Also it will be much cheaper to find a used matching transmission with low (less than 80k miles) than having a shop rebuild the old one. In most cases the used transmission will far outlast the rebuilt one. Check on the web by Googling "used transmissions".

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Most likely the reverse part of the transmission has gone bad. It will need to be overhauled.

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