Hi there, I just bought a 92 4x4 Toyota pickup with an auto trans. This is my first 4x4 i have ever owned. When I bought it it shifted just fine into over drive, now it doesnt. Also when I put it into 4hi I don't feel it engage but I do when I put it into 4lo. When I go from 4lo back to 4hi again I can feel the change, but not when I go from 4hi back to 2wd. I guess my question is, is it staying stuck in 4hi and maybe that's why it's not kicking into o/d? Any help would be appreciated
Won't shift into o/d
- Thread starter Tristanp
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KidVermicious
New member
Normally when these trucks fail to go into overdrive it's because the ECU doesn't get a signal indicating the trans has come up to temp. That could be a bad temp sensor, or it could be because the thermostat is stuck open.
You'll feel a difference between low and hi range no matter if you're in 4wd or not. When you drive around, can you feel the truck in 4wd? When you turn a sharp corner does it bind and slow the truck down? Put the truck on four jackstands and drop it in drive, do all four wheels spin?
You'll feel a difference between low and hi range no matter if you're in 4wd or not. When you drive around, can you feel the truck in 4wd? When you turn a sharp corner does it bind and slow the truck down? Put the truck on four jackstands and drop it in drive, do all four wheels spin?
KidVermicious
New member
Well, verify that you really are stuck in 4WD and if so fix that, then see if OD works again?
I don't know how the truck would spontaneously go into 4WD as you're driving on the freeway, and if it did (without giving a 4WD light on the dash) I don't know how the ECU would know about it. For the truck to be in 4WD, you have to have the shifter in 4WD to put the tcase in, and you have to have the vacuum collar on the front diff engage the longside CV shaft (unless you have manual hubs, in which case they need to be locked in). I don't know how you'd be in 4wd with the shifter in 2hi, unless the shift fork is broken, but how that happens without help on the freeway is beyond me?
In any case, if you're in 2wd the front driveshaft should spin free. Make sure the selecter is in 2hi (and the manual hubs are unlocked, if you have them) then crawl under there with a set of gloves and try and turn it - if it spins, you are definitely not stuck in 4wd. If it doesn't spin, then you're right that it's stuck in 4WD at the tcase or the diff and you'll need to dig further to find out why.
I don't know how the truck would spontaneously go into 4WD as you're driving on the freeway, and if it did (without giving a 4WD light on the dash) I don't know how the ECU would know about it. For the truck to be in 4WD, you have to have the shifter in 4WD to put the tcase in, and you have to have the vacuum collar on the front diff engage the longside CV shaft (unless you have manual hubs, in which case they need to be locked in). I don't know how you'd be in 4wd with the shifter in 2hi, unless the shift fork is broken, but how that happens without help on the freeway is beyond me?
In any case, if you're in 2wd the front driveshaft should spin free. Make sure the selecter is in 2hi (and the manual hubs are unlocked, if you have them) then crawl under there with a set of gloves and try and turn it - if it spins, you are definitely not stuck in 4wd. If it doesn't spin, then you're right that it's stuck in 4WD at the tcase or the diff and you'll need to dig further to find out why.
KidVermicious
New member
Yes, it's possible.
