POSSIBLE TRANNY PROBLEMS?
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More Turbo
Joined: Nov 2012
Posts: 727
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From: Chariton, IA
POSSIBLE TRANNY PROBLEMS?
Had to run and get a part for the mower yesterday, about 50 miles away. Truck ran fine all the way down and most of the way back. Ambiant temp was about 90 deg and the tranny was up to about 190. Came up behind a tractor and slowed down to about 20, then stepped on the go pedal and nothing happened, looked down and was at 3500rpm. Let off a second and tried again and same thing? Now I got to hit my brakes again or hit the tractor, so I wait for another car to go by then try again and all is fine. Didn't have any more troubles but I was about home. So is my tranny toast or was it a fluke in the shift strategy? When it did it I was slowing down pretty fast and went right to the throttle so it may have been in between gears, just never had it happen before.
Hotshot
Joined: Jan 2011
Posts: 18,849
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From: Puget Sound
I'd set up your Infinity to monitor your transmission more closely and have that record button ready to go. You'll want to monitor anything you can read in there and see what happens the next time. Until then - the Mk I nose and eyeball can be of service. Is the transmission fluid cherry red? Does is smell oil-ish, or burnt-plastic-ish?
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More Turbo
Joined: Nov 2012
Posts: 727
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From: Chariton, IA
Fluid is bright red and smells fine. It's never done it before. but I've only had the truck since December of last year.
The semi's we have at work are auto's and have had them do it if you hit the throttle in between gears but they're not true auto's, they have a clutch but shift electronically. They have an actual clutch instead of a TC.
The semi's we have at work are auto's and have had them do it if you hit the throttle in between gears but they're not true auto's, they have a clutch but shift electronically. They have an actual clutch instead of a TC.
Elder User
Joined: Jun 2007
Posts: 705
Likes: 1
From: Sandia Park, NM
This is what my truck was doing for the last few months before I had to get it to 2000 rpm to move forward. Is there a huge delay between putting it in D and it moving? My old trans would slip in to gear, and passing people was outright scary. My fluid looked fine, smelled fine, and had been flushed regularly. Now I have an HD4R100.
Senior User
Joined: Feb 2009
Posts: 110
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From: Arm Pit of Texas
My trans had no second gear about a month ago. It would also just rev up and not go into gear. Took it to a trans shop they could not find a problem with it. No codes and fluid good. Two weeks later my truck felt like it jumped off the ground when it shifted from 2nd to 3rd. I then looked at my trans temp and it went from 150° - 230° in a couple of min. Took it back to the trans shop, had them drive it with me in it and nothing went wrong , temp still up. Had trans shop pull pan and do a flow test. Flow test showed zero flow through trans cooler. So what was found, my torque converter ate its self and crapped its self back through the coolers and the trans. So I had them build me a HD4R100 trans and what a difference. Hope my long story might help you.
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More Turbo
Joined: Nov 2012
Posts: 727
Likes: 1
From: Chariton, IA
Haven't figured out whats wrong yet, Haven't been able replicate the problem. Though I have noticed a couple times when the tranny is under 100 deg and I get on it and it holds 2nd clear up to 3300rpm and only shifts when I let clear off the throttle. Only done this a couple times, the rest of the time it shifts great. I even hauled the horses and kids to a couple rodeo's this weekend with no problems.
I am currently monitoring TC clutch duty cycle, gear, rpm, and tranny temp. Anyone know of any other tranny PID's I should watch?
I am currently monitoring TC clutch duty cycle, gear, rpm, and tranny temp. Anyone know of any other tranny PID's I should watch?
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