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Discussion Starter · #1 ·
Any ideas?? I have a 1991 toyota 2wd 4cyl. automatic with 75k on it.
Recently I have encountered a shifting problem. About every 3rd time I
drive the truck it will go up to an abnormally high rpm before it
shifts into the next gear. I tried shifting it manually and that
doesn't work either. When it does shift it slams into the next gear.
I don't know enough about mechanics to know where to begin. Do these
transmissions have a speed sensor??
Thanks for the help. Peter
 
G

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Discussion Starter · #2 ·
<[email protected]> wrote in message
news:[email protected]
> Any ideas?? I have a 1991 toyota 2wd 4cyl. automatic with 75k on it.
> Recently I have encountered a shifting problem. About every 3rd time I
> drive the truck it will go up to an abnormally high rpm before it
> shifts into the next gear. I tried shifting it manually and that
> doesn't work either. When it does shift it slams into the next gear.
> I don't know enough about mechanics to know where to begin. Do these
> transmissions have a speed sensor??
> Thanks for the help. Peter
>


Just curious: Are you the original owner of the truck?
 
G

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Discussion Starter · #5 ·
<[email protected]> wrote in message
news:[email protected]
> Any ideas?? I have a 1991 toyota 2wd 4cyl. automatic with 75k on it.
> Recently I have encountered a shifting problem. About every 3rd time I
> drive the truck it will go up to an abnormally high rpm before it
> shifts into the next gear. I tried shifting it manually and that
> doesn't work either. When it does shift it slams into the next gear.
> I don't know enough about mechanics to know where to begin. Do these
> transmissions have a speed sensor??
> Thanks for the help. Peter
>


Start by checking the trans fluid level and condition. Is the fluid at the
full mark ? Is the fluid clean or dirty ? Does the fluid smell burnt ? Has
the trans fluid ever been changed before or is it still the original fluid ?
If the fluid was changed was the correct fluid used ?
 
G

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Discussion Starter · #6 ·
That means the friction plates(clutch pak inside an auto trans) is
going bad and starting to slip. You'll be needing another trans soon,
or have yours rebuilt.
 
G

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Discussion Starter · #7 ·
[email protected] wrote:
> Any ideas?? I have a 1991 toyota 2wd 4cyl. automatic with 75k on it.
> Recently I have encountered a shifting problem. About every 3rd time I
> drive the truck it will go up to an abnormally high rpm before it
> shifts into the next gear. I tried shifting it manually and that
> doesn't work either. When it does shift it slams into the next gear.
> I don't know enough about mechanics to know where to begin. Do these
> transmissions have a speed sensor??
> Thanks for the help. Peter
>

I'd try draining and refilling the transmission, cleaning with
www.auto-rx.net, then a complete flush and refill. This works very
well if the problem is due to varnish buildup or stiff sealing
parts. If there is mechanical damage, you'll need a rebuild soon.


Ken
 
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