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Toyota Tacoma Transmission Problems

355 messages,  Last post on Dec 01, 2009 at 7:56 AM

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#3 of 355 auto trans shifting down too readily by vstrom1 Sep 29, 2006 (6:03 pm)
I have a 2006 Tacoma 4 door, V6, auto trans. I live at 8700ft elevation. Closest towns are at 7200ft (12 miles, steep grade), and 6000ft (40 miles moderate to shallow grade). Speed limit is 75MPH. My problem happens when cruise control is engaged. Coming up the steep grade it shifts down as expected most the time, but some times will go down 2 gears, which is not nessary. On the moderate grade it will hunt between clutch locked OD (or 5th), clutch open OD, and 4th with the clutch locked or open. Eventually it will usually stay in 4th for most of the climb (which is my understanding of the "logic" of the programing for the transmission). Head winds have a noticeable effect but for the sake of this discussion let's assume they are constant and light. When I don't use the cruise control and man the throttle myself, there is only one short hill that the trans. shifts down to 4th, all the rest of the way I can keep it at 75mph + or - 3mph without it shifting down to 4th. (It does unlock the clutch a couple of times.) So the question is: Is it possible to re program the computer that controls/senses transmission and engine parameters so it will have: 1. a larger throttle opening before shifting down. When it shifts down there is still at least 1/3 of throttle travel left. (Full throttle opening/manifold pressure at 7000ft is roughly equal to 2/3rds at sea level.) 2. and/or accept a 5mph sag in set speed before shifting down.   40 miles in a lower than nessary gear is a significant fuel effiency issue. Coming home from work it is irritating to not be able to use the cruise control.   Any input from some of you engine management computer guys would be appreciated.   Thanks for your efforts, VStrom1 Replies to this message: lf05tl (Sep 30, 2006 6:27 pm) beach_brada (Sep 30, 2006 9:19 pm) goose55 (Oct 05, 2006 4:56 pm) mountainman10 (Feb 26, 2007 2:27 pm)
#4 of 355 Re: auto trans shifting down too readily [vstrom1] by lf05tl Sep 30, 2006 (6:27 pm)
Replying to: vstrom1 (Sep 29, 2006 6:03 pm) On other forums some people had same issues. All people that tried premium gas said there was a BIG improvement in the crise controll shifting. Give it a shot.
#5 of 355 Re: auto trans shifting down too readily [vstrom1] by beach_brada Sep 30, 2006 (9:19 pm)
Replying to: vstrom1 (Sep 29, 2006 6:03 pm) some reviews that I read about the tacoma said it had a so-so tranny and it searched alot for gears, and as the other guy said, premium gas should help, I also read in a different review that the tacoma seems to run better on premium. Replies to this message: goose55 (Oct 05, 2006 4:56 pm)
#6 of 355 Squeaky clutch pedal by goose55 Oct 05, 2006 (4:56 pm)
Replying to: beach_brada (Sep 30, 2006 9:19 pm) Hello Beach   You know how I might overcome the Tacoma squeaking clutch pedal that drives me crazy in damp/ rainy weather. All summer long, with low humidity, there is silence, but now that its begun to be cooler and damp, the squeaking is back! Its done this for years.   Walt
#7 of 355 ticking noise from transmission by mrw1 Oct 06, 2006 (1:09 pm)
My 05 prerunner w/5spd has a ticking noise from the trans. It stops when the clutch is lightly engaged. The dealer has changed the clutch asmbly. I changed trans to royal purple. It's better but it's still there.
#8 of 355 lost automatic transmission fluid by jetsjam Dec 12, 2006 (5:41 pm)
I have a 2005 tacoma 4.0 L DoubleCab with an automatic transmission, with 20K miles. While attempting to change my oil (for my first time with this vehicle) in the dark something I highly recommend you never do, especially with a new vehicle!), I inadvertently loosened the auto-transmission fluid bolt (funny same size 14mm too).   Well needless to say, after the first few seconds observing Toyota's "amazing red" come pouring out, I was slightly panicked. In my haste, i dropped the bolt and let about 1-2 cups (as in measuring cups...not sure exactly, but the bolt was out for about 5 seconds).   ANYWAY, I purchased a quart of fluid from a local dealer (yikes! $25/qt)but am just now finding out that there is no dipstick to check just how much i lost, and how much to replace (which brings me to another problem)   Can I safely drive without adding the fluid? Will I need a complete auto-trans fluid change? Can Toyota, any knowledgeable mechanic, or me and my "lacking auto" skills bring it back to normal??? Please help me forget the error of my ways! Replies to this message: beach_brada (Dec 13, 2006 5:03 pm) fireman73 (May 28, 2007 5:07 am)
#9 of 355 Re: lost automatic transmission fluid [jetsjam] by beach_brada Dec 13, 2006 (5:03 pm)
Replying to: jetsjam (Dec 12, 2006 5:41 pm) when i first got my 2006 doublecab I had to research a bit to find out that it doesnt have a dipstick. Its a sealed tranny that shouldnt be messed with until its due servicing. All I can say for advice is find out when the tranny needs to be serviced, maybe you arent to far away from it and can just have the dealer service it for you. Or research from the dealer or anyone else who might know how to service it yourself. I havent figured that out yet so sorry. Well thats all I can say about that. Replies to this message: fireman73 (May 28, 2007 5:07 am)
#10 of 355 2006 Tacoma Auto. Trans. Fluid by killjoy72 Dec 17, 2006 (7:47 pm)
I accidentally unscrewed the transmission fluid drain plug while doing an oil change & lost some tranny fluid.... 2 questions:   (1) Can I pour replacement automatic transmission fluid       down the tranny dipstick tube?   (2) Is there a specific kind of auto. trans. fluid for the       2006 Tacoma? Replies to this message: beach_brada (Jan 29, 2007 6:10 pm) bm1985mitch (Jul 03, 2007 6:55 pm)
#11 of 355 Hard shifting on Mamual Transmission by cjenning Dec 20, 2006 (10:44 am)
I just bought a new 07 Tacoma manual 5 speed. First gear is very "rough" to shift into. Does anybody know - Can you adjust the stick shift to make it smoother? Does it get smoother over time? Or am I stuck with it?   Thanks in advance   Carl Replies to this message: beach_brada (Dec 20, 2006 3:44 pm) cjenning (Dec 20, 2006 6:52 pm) rockla (Jan 20, 2007 2:29 pm) and 2 more... toytacstuph (Dec 28, 2006 10:09 am) missile29 (Dec 31, 2006 8:02 am) tflorida (Oct 01, 2008 6:01 pm) 95runner (Oct 26, 2009 2:12 pm)
#12 of 355 Re: Hard shifting on Mamual Transmission [cjenning] by beach_brada Dec 20, 2006 (3:44 pm)
Replying to: cjenning (Dec 20, 2006 10:44 am) Rough how? Is it hard to get into gear, or does the truck jerk while in gear? I have a 2006 auto, and it does seem as if first gear has a little kick to it. Replies to this message: cjenning (Dec 20, 2006 6:52 pm) rockla (Jan 20, 2007 2:29 pm) baker615 (Jan 21, 2007 8:39 pm) and 1 more...

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