Trans has slight slip and then clunk at take off. - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > Transmission Mods

Transmission Mods Performance Transmission Modifications

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  #1  
Old 01-28-2013, 06:22 PM
Scott89TTA Scott89TTA is offline
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2003 Chevy TrailBlazer LT
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Trans has slight slip and then clunk at take off.

When pulling away from a stop or a slow roll like off a a ramp my trans will have a slight delay or slip and then clunk as it grabs. Fluid has been changed and flushed also have the PCMforless tune for towing: removed 50% torque management and stage 2 shift. Didn't really change anything...shifts are not very firm either only a little firmer than stock at WOT only but nothing to write home about. Any ideas what is going on?
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  #2  
Old 01-28-2013, 11:10 PM
Loverotties Loverotties is offline
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Maybe low?
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  #3  
Old 01-29-2013, 11:40 AM
Scott89TTA Scott89TTA is offline
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Nah fluid level is fine. It did it before and after trans and transfer case fluids were changed/flushed at a very reputable shop. At first it only did it once and a while now almost always...and didn't do it while the trans shop had it, go figure? Almost feels like a real loose converter, if I let off the gas at low speeds and then bring it back slowly I'll get a very short slip before it engages with a little thump. Same thing if i pull away from a stop slowly...if I leave hard not as noticeable.
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Old 01-29-2013, 12:24 PM
Loverotties Loverotties is offline
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in all gears or just 1?
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  #5  
Old 01-29-2013, 12:57 PM
Scott89TTA Scott89TTA is offline
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Quote:
Originally Posted by Loverotties View Post
in all gears or just 1?
Pretty sure just 1st gear though my girlfriend has been driving it and I haven't driven it for a while so I'm not 100% on that. As mentioned it seems to do it pulling away from a complete stop or slowing down to almost a complete stop and pulling away which would definitely be in 1st gear. The slip is very short then a clunk...not a full slip where the RPM races up. Kind of reminds me of a car I had years ago with a performance converter and not enough gears...I could feather the gas and make it slip then grab...the clunk after the slip reminds me of a loose universal joint or a sloppy rear differential.
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Old 01-29-2013, 01:02 PM
Loverotties Loverotties is offline
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Sounds like a band adjustment!
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  #7  
Old 01-29-2013, 01:10 PM
Scott89TTA Scott89TTA is offline
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Quote:
Originally Posted by Loverotties View Post
Sounds like a band adjustment!
Have done several trans mods over the years (shift kits, boost valves, billet servo, etc.) assuming that is a job for the shop?
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  #8  
Old 01-29-2013, 01:29 PM
Loverotties Loverotties is offline
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I herd from a guy that does mods,say the trans in ours are weak and need repair when you go on a lot of mods and that's why there nickname is transvoy.
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  #9  
Old 01-29-2013, 02:28 PM
Scott89TTA Scott89TTA is offline
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lol...yeah my trans guy said there is a part that typically fails on them that takes out reverse and 1st gear but don't remember what it was? He said it is a poor design / weak part and is a common failure when they get up in miles. My Trailblazer came from my 70 year old mom that babied it for the 1st 75,000 miles or so. I have had it for the last 3 years and put another 30K on it mostly highway drivings to and from work with the addition of towing my car to the track a few times plus towing my car from MD to Ohio and back the Summer before last. That was just after I had the trans and transfer case serviced. That trip over the mountains probably wasn't a great idea but I made it out and back and to my knowledge only downfall was my brakes needed to be replaced shortly afterwards...as they smoked a few times coming down the mountain.

Guess I'm going to have to take it back to my trans guy to check it out.
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