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ATF vs. 80w-90 gear oil for gearbox? #533718
03/19/14 9:05 am
03/19/14 9:05 am
Joined: Feb 2014
Posts: 744
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zoe Offline OP
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zoe  Offline OP
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Z
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Do any of you use ATF in your gearbox instead of 80w-90 gear oil? It seems I have heard that some do.

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Re: ATF vs. 80w-90 gear oil for gearbox? [Re: zoe] #533732
03/19/14 10:29 am
03/19/14 10:29 am
Joined: Dec 2004
Posts: 9,483
Scotland
kommando Offline
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kommando  Offline
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Scotland
I have heard of it being used in gearboxes but its thin and escapes on bikes with older seal technology, I use 80-90W full synthetic gear oil in my boxes and its fine.

Re: ATF vs. 80w-90 gear oil for gearbox? [Re: zoe] #533734
03/19/14 10:36 am
03/19/14 10:36 am
Joined: Feb 2011
Posts: 3,497
Orygone
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Orygone
You may be confusing the oil to use for the primary versus the gearbox. The pre-unit BSA clutches run in a small amount of oil and most use Ford Dextron ATF in the primary. You want to use a gear oil in the gearbox.


Bill B...


Boomer
Re: ATF vs. 80w-90 gear oil for gearbox? [Re: zoe] #533739
03/19/14 11:11 am
03/19/14 11:11 am
Joined: Jan 2002
Posts: 42
New York
ShearedCrank Offline
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ShearedCrank  Offline
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New York
Regardless of if you have heard that it's been used, it's wrong.

While at work I broke out my Viscosity Equivalents chart, ATF is nowhere even CLOSE to the viscosity that the OEM had recommended (50 Weight Engine Oil). Times have changed and now we have dedicated gear oils that have a host of additives that make it ideal for our application (straight cut gears).

The correct cross to SAE Grade GEAR OILS, is 90W (Kommandos suggestion is fine). If you google it, you can have your own Viscosity Equivalent chart. I find it useful as I'm constantly converting AGMA to ISO grades to MobilSHC series numbers.

Matt

Re: ATF vs. 80w-90 gear oil for gearbox? [Re: ShearedCrank] #533749
03/19/14 12:56 pm
03/19/14 12:56 pm
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zoe Offline OP
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zoe  Offline OP
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Thanks you to all.

Bob


Moderated by  Rich B 


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