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Car Forum / Driving, Maintenance, Tuning / General Car Topics / December 2005automatic transmision, shifting while car in motion ?
a friend (who happens to drive a stick) was driving my Highlander ( w/AT={P R N D 3 2 L}) , shifted the shifter forward from (D)rive maybe up through into (R)everse and then back down into Drive while car was moving/coasting at about 10-15 Mph the car was coasting (not accelerating) as it was about to come to a stop I did not feel any jerking or bucking or notice any abrupt movement or clunkinging or any wierd sound from the Highlander when this shift was performed ? Ques : Is there any chance that the tranny was harmed/affected by this type of shift ? What kind of problem might i look/listen/feel/test for ? Related Ques: When shifting from Reverse into Drive is it considered good practice to make car come to complete STOP before shifting nto Drive ? -or- can one shift from Reverse to Drive while car is rolling backwards (without harming tranny)? Tia or any useful help robb > Ques : > Is there any chance that the tranny was harmed/affected by this type of > shift ? > What kind of problem might i look/listen/feel/test for ? ****While not recommended, an accidental shift into Reverse like this normally does not cause a problem. > Related Ques: > When shifting from Reverse into Drive is it considered good practice to make > car come to complete STOP > before shifting nto Drive ? ****You are putting an abrupt load change on the axles, CV joints, etc when you bounce from Reverse to Drive without coming to a complete halt. It is like anything else you abuse mechanically...you may get away with it for a long time, but you are likely to experience failure moreso than a person who drives gently. >> Ques : >> Is there any chance that the tranny was harmed/affected by this type of [quoted text clipped - 4 lines] > normally > does not cause a problem. Unless you are 17 years old driving the family Motorhome on a cross country trip and it locks up the transmission. Thereby spending a wonderfull two days in some small town in the middle of no where. Dad was a good guy, only told me not to do that again :) > a friend (who happens to drive a stick) was driving my Highlander ( w/AT={P > R N D 3 2 L}) , shifted the shifter forward from (D)rive maybe up through [quoted text clipped - 22 lines] > Tia or any useful help > robb If you didn't feel anything there is probably no consequence to it. He may have moved the lever so fast that it never even tried to go to reverse. And if it did, apparently you were rolling fast enough that the transmission locked it out of reverse. Next time you use your friend's car, feather the clutch a bit. >> Related Ques: >> When shifting from Reverse into Drive is it considered good practice to [quoted text clipped - 13 lines] > the transmission locked it out of reverse. Next time you use your > friend's car, feather the clutch a bit. Um, what're ya sayin' Ray? payback is a bitch? <snipped> >> If you didn't feel anything there is probably no consequence to it. He >> may have moved the lever so fast that it never even tried to go to [quoted text clipped - 3 lines] > > Um, what're ya sayin' Ray? payback is a bitch? I'm not the one who posted that, but I like the idea! Another possibility is to demonstrate how to shift a manual transmission without the clutch.  SignatureRay O correct the return address punctuation to reply ><snipped> >> [quoted text clipped - 8 lines] >I'm not the one who posted that, but I like the idea! Another possibility >is to demonstrate how to shift a manual transmission without the clutch. It can be done, if you match the revs....... but why do that? The more RPMS when you attempt a clutchless shift, the better, right? <e,EG> -LMB >><snipped> >>> [quoted text clipped - 15 lines] > > -LMB I think payback should be roughly equal. You can shift a manual transmission without using the clutch but many people do not know that so you can scare the taillights out of them without actually doing any harm, just like they did when they shifted your transmission to reverse. Feathering the clutch would actually do more damage than a clutchless shift. SignatureRay O correct the return address punctuation to reply >>><snipped> >>>> [quoted text clipped - 21 lines] >just like they did when they shifted your transmission to reverse. >Feathering the clutch would actually do more damage than a clutchless shift. I know, but if you don't match the RPMs properly, then you grind the living sh.t out of the dogs teeth, and THAT would make a lot more noise... (but not TOO much damage) -LMB > <snipped> >> [quoted text clipped - 8 lines] > I'm not the one who posted that, but I like the idea! Another possibility > is to demonstrate how to shift a manual transmission without the clutch. I realized that right when I clicked Send. Yeah, there have been times on 3 Yotas where the Master has given out and I've had to hit the syncros myself! SignatureI've spent a great deal of money on Whiskey, Women and Fast Cars The rest I've squandered. > a friend (who happens to drive a stick) was driving my Highlander ( > w/AT={P [quoted text clipped - 11 lines] > Is there any chance that the tranny was harmed/affected by this type of > shift ? Since you have an electronically controlled transmission, probably not. That said, doing stuff like that is not very kind to the transmission and drivetrain. > What kind of problem might i look/listen/feel/test for ? If you have a problem, it will show up 60,000 or 70,000 miles from now due to premature wear. > Related Ques: > When shifting from Reverse into Drive is it considered good practice to > make > car come to complete STOP > before shifting nto Drive ? Absoultely! > -or- can one shift from Reverse to Drive while car is rolling backwards > (without harming tranny)? > > Tia or any useful help > robb Shifting from reverse to drive and vice versa while the vehicle is rolling puts premature wear on the friction surfaces in the transmission. Instead of lasting 200,000 + miles, it may only last 100,000 miles. SignatureRay O correct the return address punctuation to reply > Ques : > Is there any chance that the tranny was harmed/affected by this type of > shift ? > What kind of problem might i look/listen/feel/test for ? 10 mph is pretty fast- you'd have FELT it (but good!) if the trans had actually engaged. My guess is that the electronics didn't allow it. > Related Ques: > When shifting from Reverse into Drive is it considered good practice to make > car come to complete STOP > before shifting nto Drive ? That depends on the transmission design, so *in general* I'd have to say its a good practice. That said, I rarely do. I just shift while gently rolling, because none of my transmissions are bothered by doing so (some transmissions utilize an overrunning clutch in low gear that would be damaged by being forced the "wrong way." ) Thanks to all responses and i was a little relieved *BUT* I may have spoken to soon, it seems that the shifting is more clunky than prior to shift incidence. by clunky i mean when shifting from Park to Rev at rest, it seems that there is more clunking surging as tranny engages, and the same for Rev to Drive, the tach shows idle below 1000 (est 750 -800) so i don't think it is a high idle issue. Plus there is some odd shifting behavior at low speed start / stop at Starting there seems to be a bit of LAG before picks up when Stopping the car (sometimes) surges/lunges a bit just before car comes to a stop Lunge mostly occurs under condition of driving along 45 mph then stop/decelerate rather quickly and then at about 5 mph a small hiccup/lunge. Anyway if you have any advice on this Help appreciated. Thanks again to all that responded robb > Thanks to all responses and i was a little relieved > [quoted text clipped - 27 lines] > Thanks again to all that responded > robb Sounds like something is slipping. I would get the transmission fluid changed, keeping an eye out for metal particles or friction material in the drained fluid. SignatureRay O correct the return address punctuation to reply |
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