08-23-2012, 11:04 PM
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#1
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Cummins Member
Join Date: Aug 2011
Location: Blanchard
Age: 29
Posts: 3,267
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Haha don't it happens to the best of us. Next time you drive it going down the road, push the button on your shift lever, that turns O/D on and off. If it jumps up the rpm's, that means its working and kicking it up into 3rd gear. Push it again and it'll shift back into 4th (O/D). That'll verify that its still working. There's also a little orange light that comes up on the dash that says "O/D off" when you push that button.
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08-23-2012, 11:30 PM
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#2
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Coffee, Gas, Ammo. Set!
Join Date: Aug 2011
Location: Work, Garage, Computer room
Posts: 685
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Originally Posted by ramthis9501
Haha don't it happens to the best of us. Next time you drive it going down the road, push the button on your shift lever, that turns O/D on and off. If it jumps up the rpm's, that means its working and kicking it up into 3rd gear. Push it again and it'll shift back into 4th (O/D). That'll verify that its still working. There's also a little orange light that comes up on the dash that says "O/D off" when you push that button.
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Actually this is partially true. You're od doesn't engage but your tc lockup does.
I think this is where the confusion comes. Our trannies are actually 3 speeds with a lockup converter and overdrive.
I am told you can disengage the tc but you have to dig into the pcm wiring harness.
Last edited by Okiespaniels; 08-23-2012 at 11:33 PM.
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08-23-2012, 11:59 PM
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#3
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Newbie
Join Date: Nov 2011
Location: Miami
Age: 67
Posts: 26
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Originally Posted by Okiespaniels
Actually this is partially true. You're od doesn't engage but your tc lockup does.
I think this is where the confusion comes. Our trannies are actually 3 speeds with a lockup converter and overdrive.
I am told you can disengage the tc but you have to dig into the pcm wiring harness.
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With o/d on the trans shifts 1,2,3,4,+t/c.
With o/d off the trans shifts 1,2,3,+t/c.
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08-24-2012, 01:53 PM
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#4
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Coffee, Gas, Ammo. Set!
Join Date: Aug 2011
Location: Work, Garage, Computer room
Posts: 685
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Originally Posted by trouble
With o/d on the trans shifts 1,2,3,4,+t/c.
With o/d off the trans shifts 1,2,3,+t/c.
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I thought sean told me different. How much should the tc lock up drop the rpms>? I klnow theres a dynaflow takes place and I always thought it was the tc.
Either seans confused or he's confused me. Pat is correct tc lockup should be last.
Is your TC locking up? You should see a several hundred rpm drop even on a diesel. I go from 1800 rpm at 42 mph to like 1200 rpm when the tc locks.
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08-24-2012, 10:33 PM
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#5
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Newbie
Join Date: Nov 2011
Location: Miami
Age: 67
Posts: 26
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I thing the gear change is about 750 and the t/c like 250. When i'm on the highway ( 60 -70 -80 whatever ) the shift from 3rd to 4th +t/c will generally drop 1000 rpm. My 97 will lock up the t/c when it shifts to 4th.
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08-24-2012, 10:44 PM
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#6
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Newbie
Join Date: Nov 2011
Location: Miami
Age: 67
Posts: 26
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Lt.Dan, i will be in Tulsa sunday if you want i could bring the the box with me so we could hook it up and see what it's doing.
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