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2003 Tacoma: 80W-90 for Diff AND Transmission?



 
 
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  #21  
Old November 19th 10, 05:49 PM posted to rec.autos.tech
Josh[_8_]
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Posts: 16
Default 2003 Tacoma: 80W-90 for Diff AND Transmission?

>In the case of the OP, a Toyota MDT Tech told me the OP's chosen GL-5 oil
>will do just fine in both tranny and diff. He might encounter slightly-
>stiff shifting in cold weather, but that's not a big deal.



Thanks guys.
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  #22  
Old November 19th 10, 05:49 PM posted to rec.autos.tech
jim beam[_4_]
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Posts: 3,204
Default 2003 Tacoma: 80W-90 for Diff AND Transmission?

On 11/19/2010 07:53 AM, Scott Dorsey wrote:
> jim > wrote:
>>
>> ep additives wouldn't "eat" them away - it would lubricate the cone
>> clutches [in that kind of] synchro so they didn't clutch properly. if
>> they don't clutch, then the gear meshing dogs grind.

>
> Could be. Thing is, the EP additives are sulfur compounds that form sulfur
> complexes on the surface of steel. This is a kind of corrosion, but it's a
> kind of corrosion that prevents galling and greatly improves lubrication
> performance at high pressures.
>
> Unfortunately those additives will cause uncontrolled corrosion on some
> copper alloys. I have seen film projector gearboxes where people replaced
> the turbine oil with similar viscosity gear oil, and it literally dissolved
> brass and bronze parts.
> --scott


could well be. however, there are sulfur compounds routinely added to
extreme load worm drive gearboxes, and they often have copper-based
grown gears. and some level of sulfur ep additives are routine in
synchro vehicle transmissions that use copper-based cone clutches.

i guess we're coming down to the specifics of the /type/ of sulfur
compound, their stability, the specifics of the alloy, and the specifics
of their environment, like temperature, exposure to oxygen, etc.

best policy is that, unless you have specific knowledge, just stick to
manufacturer spec. the old mechanics joke is about the customer
complaining about a $200 bill for "you just hit it with a hammer -
that's not worth $200!" and the mechanics response of "hammer blow - $1,
knowing where to hit, $199.". you might be able to buy alternative oils
cheaper, but knowing /which/ one to buy is what you're paying for.


--
nomina rutrum rutrum
  #23  
Old November 19th 10, 05:51 PM posted to rec.autos.tech
jim beam[_4_]
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Posts: 3,204
Default 2003 Tacoma: 80W-90 for Diff AND Transmission?

On 11/19/2010 08:04 AM, Tegger wrote:
> (Scott Dorsey) wrote in
> :
>
>> jim > wrote:
>>>
>>> ep additives wouldn't "eat" them away - it would lubricate the cone
>>> clutches [in that kind of] synchro so they didn't clutch properly. if
>>> they don't clutch, then the gear meshing dogs grind.

>>
>> Could be. Thing is, the EP additives are sulfur compounds that form
>> sulfur complexes on the surface of steel. This is a kind of
>> corrosion, but it's a kind of corrosion that prevents galling and
>> greatly improves lubrication performance at high pressures.
>>
>> Unfortunately those additives will cause uncontrolled corrosion on
>> some copper alloys. I have seen film projector gearboxes where people
>> replaced the turbine oil with similar viscosity gear oil, and it
>> literally dissolved brass and bronze parts.

>
>
>
>
> In the case of the OP, a Toyota MDT Tech told me the OP's chosen GL-5 oil
> will do just fine in both tranny and diff. He might encounter slightly-
> stiff shifting in cold weather, but that's not a big deal.
>
>


that would bother me. "stiff shifting" is caused by the synchro
clutches not clutching. that may be fine short term, i wouldn't want
that situation to persist if it was a vehicle i was trying to make last
any length of time.

--
nomina rutrum rutrum
  #24  
Old November 19th 10, 08:42 PM posted to rec.autos.tech
Scott Dorsey
external usenet poster
 
Posts: 3,914
Default 2003 Tacoma: 80W-90 for Diff AND Transmission?

jim beam > wrote:
>
>could well be. however, there are sulfur compounds routinely added to
>extreme load worm drive gearboxes, and they often have copper-based
>grown gears. and some level of sulfur ep additives are routine in
>synchro vehicle transmissions that use copper-based cone clutches.
>
>i guess we're coming down to the specifics of the /type/ of sulfur
>compound, their stability, the specifics of the alloy, and the specifics
>of their environment, like temperature, exposure to oxygen, etc.


I think a lot of it has to do with the specifics of the alloy, yeah.

>best policy is that, unless you have specific knowledge, just stick to
>manufacturer spec. the old mechanics joke is about the customer
>complaining about a $200 bill for "you just hit it with a hammer -
>that's not worth $200!" and the mechanics response of "hammer blow - $1,
>knowing where to hit, $199.". you might be able to buy alternative oils
>cheaper, but knowing /which/ one to buy is what you're paying for.


The problem is when you wind up with a manufacturer spec for a product
that hasn't existed for a few decades. Then translating that to a modern
equivalent can become an issue.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."
 




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