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Old Nov 24, 2025 | 03:18 PM
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05 six speed Z51 (22K) is shifting like the shifter is in a “bag of rocks”! Recently put in Dexron 6. Any thoughts on diagnosis and correction?
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Old Nov 24, 2025 | 07:05 PM
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Kinda funny my 05 with automatic isn't shifting correctly, no lights on the dic, no noise from the transmission, BUT won't shift through gears till I give it gas watch RPM climb and then shift no bang just smooth next gear.

It's in the shop now waiting to hear first the cost, and what part failed, either sensor, possible vacuum leak I doubt, just waiting for phone call.
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Old Nov 30, 2025 | 02:55 AM
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Sounds like your synchronizer went out. Which is still a full rebuild
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Old Nov 30, 2025 | 01:21 PM
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Originally Posted by Kenscape
05 six speed Z51 (22K) is shifting like the shifter is in a “bag of rocks”! Recently put in Dexron 6. Any thoughts on diagnosis and correction?
dexron 6 when it came out was NOT to be used in manual transmissions. My recollection is that its too thin and will break the manual trans. My personal prefernce is dexron 3 by motul. I cant remember what year but paper blocker rings are an issue so gm fluid is best.
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