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Gm transmission question

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Forum Name: Shops, Barns, Varmints, and Trucks
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=157891
Printed Date: 19 Aug 2025 at 1:48pm
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Topic: Gm transmission question

Posted By: bobkyllo
Subject: Gm transmission question
Date Posted: 05 Feb 2019 at 2:44am

Hey guys I swapped transmissions in my two Chevy pickups. I took the transmission from my 2000 k2500 and put it in my 1997 Chevy k2500.

The 97 is a snow plow truck. I've noticed while plowing snow that she times while shifting from reverse to forward that the transmission has to think a little bit before engaging. Once it engages it's in. I don't think it's slipping. But it does not do this all the time. There are times this works flawlessly and then next time it gets it in its head to do this extra thinking.

Might I have a bad transmission range sensor in the side of the transmission

Replies:

Posted By: Tbone95
Date Posted: 05 Feb 2019 at 7:34am

Assuming you rechecked the fluid level?

Posted By: steve(ill)
Date Posted: 05 Feb 2019 at 8:53am

probably dirty oil sticking one of the valves... Drain and flush MIGHT help.. CLEAN fluid is always an advantage.

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Like them all, but love the "B"s.

Posted By: tadams(OH)
Date Posted: 05 Feb 2019 at 1:57pm

If Shameless would back off that machine of his them GMC would work ok cause they wouldn't be needed as much

Posted By: jaybmiller
Date Posted: 05 Feb 2019 at 2:26pm

Should you also have changed the computer ?

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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)

Never burn your bridges, unless you can walk on water

Posted By: Brian Jasper co. Ia
Date Posted: 05 Feb 2019 at 5:59pm

Did you do anything with the cooler? 4L80E is notorious for the TCC in the converter coming apart and clogging the cooler. A clogged cooler will make them act strange, delayed shifts, and ect.

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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford

Posted By: bobkyllo
Date Posted: 05 Feb 2019 at 8:37pm

There should be no computer that needs to be changed if I remember right. I was taught the range sensor was the computer.

No I did not change the cooler. Reverse band broke in the old one. Never gave the cooler a thought.

The shifting might be fantastic for half hour and then the next few shifts it may take longer to shift. But when it does it shifts nice and firm. No banging and no sloppy easy slipping into gear.

That's what made me think of a bad range sensor. Because the trans wouldn't be told what gear I went to.

Posted By: Hoss
Date Posted: 05 Feb 2019 at 8:48pm

shift cable/ linkage adjusted properly?

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I got both ends meetin in the middle but I can't seem to get em tied.