What's your "Lockup speed"? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-21-2005, 04:50 AM   #1
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Default What'* your "Lockup speed"?

I was reading another post, and someone mentioned that their torque converter wouldn't lock up in OD until around 50 mph. Mine will lock up at around 46mph and stay locked up if I drop down to 44-ish.

How about you all?
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Old 05-21-2005, 08:06 AM   #2
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48MPH in 3rd or OD. Normal for our cars. Mine wouldn't lock up until after 50MPH, however she would stay locked up until I gave her some gas, or she dropped into 2nd gear. Never was able to get her to unlock until the TPS readings changed dramatically, or the tranny downshifted to 2nd.

You're fine with what you have. Nothing to worry about. Great for your fuel economy.. 45mph is horrible for me.. my tranny doesn't know whether to choose 2nd or 3rd.. and it likes to switch it up [retarded].


-justin
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Old 05-21-2005, 12:23 PM   #3
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OSG, thats that low gearing you have...lol

The THM440-T4'* had that shiftability issue... Sometimes they would gearhunt...

Some of the old 700R4'* were like that too...


Its normal for these transmissions to drop into overdrive at 48-50 with very light load and hit lockup...( I love hearing the groan myself )... Mine will stay locked up untill about 46 mph, below 45 it wants to shift back to drive...

In drive the TCC can come in at 35-40 mph depending on load... Get a nice groan there too...lol

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Old 05-21-2005, 12:25 PM   #4
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Mine usually will lockup around 44mph (70km/h) and stay locked up give or take a few mph. Yours sounds fine JMFC.

Man I'm glad my car had its tranny rebuilt before I got it...
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Old 05-21-2005, 12:45 PM   #5
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Oh, I wasn't worried at all. I just know these things varried just a bit, and wondered how close I was to the average. Thanks for the replies.
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Old 05-21-2005, 01:05 PM   #6
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all of these transmissions will vary a bit... The 2.84, 2.97 and 3.33 will be slightly diffrent...

My 2.84 will usually tap OD with TCC lock at 48-50... And will keep the TCC applied untill 46... 45 will release it

So its pretty normal...lol

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Old 05-21-2005, 02:02 PM   #7
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Quote:
Originally Posted by captainmiller
Mine usually will lockup around 44mph (70km/h) and stay locked up give or take a few mph. Yours sounds fine JMFC.

Man I'm glad my car had its tranny rebuilt before I got it...
sounds about right, plus or minus a couple mph.
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Old 05-22-2005, 03:47 AM   #8
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Here'* a silly question that I'm sure has been answered in so many previous posts that you'll just tell me to do a search, but I'll ask it anyway: How can I find out what my gearing is? If it'* on the spare tire cover or inside the trunk, I think that came off years ago... If so, is there another way to know?
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Old 05-22-2005, 09:47 AM   #9
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Take apart your differential, I betcha the final drive gear says the ratio.

Actually, if you go to the Dealer, can't you get a printout of your RPO Codes and all that Dealer whatnot bs? Yeah, I think you can. That is the only way, unfortunately.


-justin
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