GMT 900 Trucks General Discussion 2007 - 2013 Trucks | General Discussion

new Circle D converter installed in NNBS

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Old 01-13-2010 | 08:06 PM
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Default new Circle D converter installed in NNBS

I just finished my 3k converter install today and it makes take-offs much more fun. It drives pretty good, did not change tune yet. I do wish it was a tad tighter around town since I have alot of hills around here, but I can live with it. Need to install my tranny cooler yet. This may sound crazy, but I may have Nelson actually lower my lock-up speed. I think stock is ~41 mph. I may make it ~37. I do alot of low RPM luggin' and I'm just below the lock-up. Let me know what others think? I am going to remove the last 20% TM, up part throttle shift firmness, and raise WOT shift points to 5900/5800.
Old 01-13-2010 | 08:10 PM
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Was it hard to install???
Old 01-13-2010 | 08:29 PM
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No, just time consuming.
Old 01-13-2010 | 10:18 PM
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Jeff, any special details about the install you would care to share? maybe a write up on it?
Old 01-14-2010 | 05:48 AM
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Nothing special on the install. I actually followed a fellow member's post for the install. The post was "Circle D in 2008 CCSB" posted by jamkeniff. Look in GMT900 section, page 3.
Old 01-14-2010 | 09:13 AM
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What do you mean by "tighter" converter? And how does changing the lock up do anything.


sorry, I'm not tech on converters yet lol
Old 01-14-2010 | 11:44 AM
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I was hoping it wouldn't spin as high tooling around town, not in lock-up. But, it's not that bad. I want the lock-up speed down some, because most of my to/from work, store, etc... is at ~37-40mph. Below the lock-up speed. I would like to lower that speed some, to engage at my ~"tooling around" speed. I think I will firm up the part throttle shifts.
Old 01-14-2010 | 03:17 PM
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Your 3rd gear lockup speed will probably suit you better for driving around town. Try driving around town in 3rd instead of overdrive, and see how it does. Of course, I'm assuming your tuner didn't remove your 3rd gear lockup settings.
Old 01-17-2010 | 09:29 PM
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No go with 3rd gear in town, still surges up/down ~200 rpm's. Assuming this unlocking/locking. Also does as stated in 4th. can't get a good solid lock-up until about 60mph. I need to send my PCM's back to Allen for a retune. Just not quite sure what to ask for. Lower my lock-up speeds for 3rd/4th, and adjust to hold in lock-up while under a little more pedal than it does now?
Old 01-18-2010 | 11:10 AM
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congrats man..glad you upgraded to a Circle D
i love my 3200 except in stop an go traffic like you say..but i can live with it.
i just bought another Circle D but a 3000 for my LSx swap.
did you put billet servos in?
im pulling my starter to double check the tq converter bolts..i worry a lot that i didnt tighten them enough..but im sure i did. i just like double checking to make sure.

now you to get to the track an see how much it improved your 1/4 mile time


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