High OD transmission RPM's...Need help and info. - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 05-30-2006, 02:24 PM   #1
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Default High OD transmission RPM'*...Need help and info.

Allright, I need to know if I really have a problem. What RPM should a stock 93 with the L27 and the 2.84 4t60-E runs at 70 MPH. I dont think it ever drops into overdrive. Here is what my RPM'* run:

60-2000
70-2300
75-2500

It doesnt seem like this could be the right RPM for my car with the 2.84. It seemed to drink a quater of a tank yesterday on the highway going 55-75 the whole time, for about 30-40 miles. What is up with my transmission? Is it running high?

*Also, my car is shifting at 6000 or so the tach says when I redline it. I have yet to figure out if the tach is off. Please give me the RPM'* your car runs with the 2.84 at the speeds listed.

Thanks,
Andrew
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Old 05-30-2006, 02:26 PM   #2
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I used to own a 93 with the 2.84 gearing. I loved it because on the highway, doing 75, it would run at about 1,900 RPMs.

Since your car indicates that it shifts at 6,000 RPMs at WOT, I'm willing to bet that it'* also indicating much higher RPMs at highway cruising speeds.
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Old 05-30-2006, 02:41 PM   #3
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Andrew...

check the vacuum to the modulator on the front of the trans and consider that tps etc can cause odd shift points.

I'm wondering about your TCC lockup.
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Old 05-30-2006, 02:44 PM   #4
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Quote:
Originally Posted by BillBoost37
Andrew...

check the vacuum to the modulator on the front of the trans and consider that tps etc can cause odd shift points.

I'm wondering about your TCC lockup.
I'm a little confused on this, so can I get a picture or something I need to look for?

Thanks guys!
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Old 05-30-2006, 03:02 PM   #5
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I'm almost willing to bet you have a lot of TC slip. Can you get a scan while driving?
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Old 05-30-2006, 03:09 PM   #6
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As JW mentions, it'* not a picture type of thing. You'd need a scan tool to see what is going on with the parameters of the engine/trans
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Old 05-30-2006, 05:06 PM   #7
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Quote:
Originally Posted by BillBoost37
As JW mentions, it'* not a picture type of thing. You'd need a scan tool to see what is going on with the parameters of the engine/trans
I want a picture of what vacume line thing i need to check....lol
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Old 05-30-2006, 05:11 PM   #8
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Old 05-30-2006, 06:24 PM   #9
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Do your rpm'* drop at about 48mph in OD with a steady throttle?
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Old 05-30-2006, 10:12 PM   #10
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Quote:
Originally Posted by willwren
Do your rpm'* drop at about 48mph in OD with a steady throttle?
yes, it does. And I checked the vacume lines....I need to replace a bunch of them. There isnt a major leak, but i'm sure its got to be leaking some. My next though is, since it does go into OD, if the tach is +400, then it would be about right.

This is what my rpm'* would be if you subtract the 400 from my off tach.

Speed---------My RPM--------------- -400 RPM
Idle* 1000* 600*
60 2000 1600
70 2300 1900
75 2500 2100

*-My idle never drops below 1000. EVER. Most cars I know of idle around 5-600, including my Mom'* 00 SE.

Does this sound like tach since it goes into OD at 48 and the tach says it shifts at 6000, which the computer shouldnt let happen. Oh, and I can downshift into 2nd at 80 MPH. Should that happen in the 2.84. Its near 6000 when it does that on the tach.
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