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'99 - '06 GM Truck Modifications
Differential & Driveline
4L80 transmission shifts hard when at operating temperatures
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<blockquote data-quote="VH2K" data-source="post: 29570" data-attributes="member: 15488"><p>Hi guys!</p><p></p><p>Suburban 2500LT owner from Norway here. Bought myself a 2000 Suburban 2500LT December of last year. Main issue, among many, is that when the transmission is at normal operating temperatures, like driving for +/- 20km, or 12 miles in freedom units, without any load like a trailer or in the car, is that it shifts REALLY hard from 3rd to 4th. It might do this between other gears as well, but 3rd to 4th is the first and most noticeable. I have not done anything to the transmission other than add some stopleak-stuff/gasket renewer because of a, well, leak, which has stopped. The transmission did this before I added the stopleak so I don't think this is the reason for the hard shifts. Anyone here experienced this before? Is the transmission shot, or could this be an easy fix?</p><p></p><p>I'll try to add some pics of the 'burb below, don't kill me if they don't show up on my first post :-D</p><p></p><p></p><p>[ATTACH=full]6345[/ATTACH]</p><p>With wintertires/rims, summertires are 285/55R20's (might add pics later)</p><p></p><p></p><p>[ATTACH=full]6346[/ATTACH]</p><p>Changed every bulb in front to LED, never tried the headlights in traffic yet, since this part of Norway has basically almost sunlight all the time this part of the year. (So I don't know if they blind oncoming traffic or not ;-D )</p><p>The DRL's/park lights are switched out with switchback-leds, so both operate as DRL's and turnsignals.</p><p>(Believe me, the 4 extra lights in front makes everything look like daylight when it's dark outside)</p><p></p><p></p><p></p><p>Edit: The car has +/- 176000 miles on it, and to my knowledge this is the original transmission.</p></blockquote><p></p>
[QUOTE="VH2K, post: 29570, member: 15488"] Hi guys! Suburban 2500LT owner from Norway here. Bought myself a 2000 Suburban 2500LT December of last year. Main issue, among many, is that when the transmission is at normal operating temperatures, like driving for +/- 20km, or 12 miles in freedom units, without any load like a trailer or in the car, is that it shifts REALLY hard from 3rd to 4th. It might do this between other gears as well, but 3rd to 4th is the first and most noticeable. I have not done anything to the transmission other than add some stopleak-stuff/gasket renewer because of a, well, leak, which has stopped. The transmission did this before I added the stopleak so I don't think this is the reason for the hard shifts. Anyone here experienced this before? Is the transmission shot, or could this be an easy fix? I'll try to add some pics of the 'burb below, don't kill me if they don't show up on my first post :-D [ATTACH type="full" alt="Screenshot 2026-07-10 225148.png"]6345[/ATTACH] With wintertires/rims, summertires are 285/55R20's (might add pics later) [ATTACH type="full" alt="Screenshot 2026-07-10 225215.png"]6346[/ATTACH] Changed every bulb in front to LED, never tried the headlights in traffic yet, since this part of Norway has basically almost sunlight all the time this part of the year. (So I don't know if they blind oncoming traffic or not ;-D ) The DRL's/park lights are switched out with switchback-leds, so both operate as DRL's and turnsignals. (Believe me, the 4 extra lights in front makes everything look like daylight when it's dark outside) Edit: The car has +/- 176000 miles on it, and to my knowledge this is the original transmission. [/QUOTE]
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'99 - '06 GM Truck Modifications
Differential & Driveline
4L80 transmission shifts hard when at operating temperatures
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