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problem with transmission(or maybe not)

Discussion in 'Technical Chat' started by pisurf1, Mar 2, 2012.

  1. Mar 2, 2012 at 5:47 PM

    pisurf1 [OP] New Member

    Mar 2, 2012
    daytona beach
    06 prerunner
    i have a 2006 prerunner double cab automatic with 84k on it. when it downshifts out of 4th gear into 3rd it will hesitate and then jump forward.
    it only does it when its down shifting. i was wondering if this is the transmission or maybe hopefully something less serious. also when i come to a stop light about ten seconds after i come to a complete stop with my foot completely on the brake the truck jumps forward on its own. it feels like i am being bumped by someone. these problems just started and i was wondering if anyone has had any of these problems before and could contribute some feedback.
  2. Mar 2, 2012 at 9:19 PM
    Joe D

    Joe D .

    Nov 13, 2011
    Welcome to the site!

    Sorry you're having issues.

    Not had the problem but, hang out a while and I bet someone has some input.
  3. Mar 4, 2012 at 6:05 AM

    Texoma IG: cwehlin

    Feb 1, 2011
    First Name:
    Lago Vista, TX
    10 Taco 4x4
    A bunch a cool stickers, a bada ass MetalMiller Tx Longhorns grill emblem painted Hemi Orange, JBA long tube headers with o2 sims, Diff breather mod, Red LED interior lights, Fancy head unit that plays ipod n movies, Also DIY install factory stuff like, factory cruise control, factory intermittent wipers, OME nitro struts with 886x springs and toy tec top plate, JBA high caster UCA's for better alignmnet and dey beefier too, Old Man Emu Dakar leaf springs in da rear with the gear, U bolt flipper, Ivan Stewart TRD rims with 33" K Bro 2's, some bad ass weather tech floor liners so I don't muck up my interior, an ATO shackle flipper for mo travel in da rear wit the gear, also super shiny Fox 2.0 shocks back there too, all sorts of steal armor for bouncing off of the rocks like demello sliders, AP front skid, trans skid, n transfer skid, demello gas tank skid, and a tough as nails ARB bumper with warn 8k winch, I'm sure there's more
    At the stop light, do you have your heater or AC on? It very well could be the ac compressor clutch engaging and disengaging. For your downshift from 4-3, try disconnecting your battery overnight and reconnecting in the morning. This will fully de-energize the computers in the truck and your ECT will have to relearn your driving habits. Might work, might not, it's free though.
  4. Mar 4, 2012 at 6:23 AM

    90YotaPU The Messiah

    May 15, 2010
    First Name:
    Union County, NJ
    1990 Toyota 4x4 (Pre-Taco)
    Aftermarket Stereo, Spidertrax Wheel Spacers, HF Air Horns, 3" Lift
    Sounds normal to me. My '99 did both of these all of the time. When it downshifts, do you have your foot on the gas (like going up a steep hill)? Usually when you're accelerating up a hill, the transmission downshifts due to a pressure drop in the valve train or when you push the gas pedal down more than half way. The hesitation would be the truck slowing down while going up hill. Do to the drop in pressure, the trans downshifts and lurches forward to react to your foot on the gas.

    The lurching forward at a traffic light is most likely the AC compressor kicking on. Mine did that all the time.

    Now I have a manual trans so I don't have this anymore but I'm sure nothing has changed.

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