Question about 1998 Chevrolet K1500

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Hard 1-2 shift

I have 1998 Cheyenne. When I bought the truck at 195k km it had a hard 1-2 shift...sometimes when it's cold but always when it's warmed up. There was a code 1870 I believe at the time. I had the transmission rebuilt by Mr Transmission at 200K km and the problem went away for about 8 months....then returned. Driving it like that now and the truck has turned 275K km. They tell me that they replaced the valve body as part of the rebuild by the way.

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Converter valve bore in valve body is worn out, only fix is oversize valve.

Posted on Feb 18, 2009


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98 chevrolet 1500 c/k shifts hard sometimes from 1 to 2

don't get too frustrated jeremy it's not real bad , all you need is a simple tune-up and / or flush . it sounds like a slight issue with the vaccuum in which your getting less than normal as it starts getting warm. old fluid , slight leak at the pan or the output shaft seal , inthe back of tranny at the drive shaft , or aleak in the vaccuum line that goes in to the side of your trans. you have a vaccuum operated valve called a modulator valve that controls the firmness of your shift.less vaccuum the harder the shift. a simple flush and tune will most likely fix your problem. just give her a little finness every once in a while and she wont let you down... she'll be loyal , and if she don't , take her to a ford dealership and drop her off and leave her i a new ford truck. no dont do that just getting into more problems doing that. use a full synthetic fluid to put back into your tranny , depending on your budget of course, bring the shop some lucus or royal purple synthetic fluid to go back in it. good luck

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