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Bielakt13
Samba Member
Joined: August 11, 2024
Posts: 41
Location: Chicago
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 Posted: Wed Jul 02, 2025 8:44 am Post subject: Transaxle Oil |
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Hi, I know there have been many topics on this but hoping someone can give me straight answer.
I just received a rebuilt freeway flyer transaxle. I put it in and filled it with Lucas 80W-90 gear oil(car was level) until oil came out the side. The next day I had leaks from the side plates (both sides) of the trans.
The bottle of oil says nothing about it being synthetic.
Additionally, I called the builder and they asked how much I put in. This was between 2.5 and 3 quarts.
They told me this is too much, I should do 1.5 quarts as the additional weight will make it leak. I know this to be false.
I was hoping I am using the wrong oil and someone can point me in the right direction. |
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Glenn 
Mr. 010
Joined: December 25, 2001
Posts: 79493
Location: Sneaking up behind you
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| Posted: Wed Jul 02, 2025 8:54 am Post subject: Re: Transaxle Oil |
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On level ground, fill it until the lube runs out of the fill hole.
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
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עַם יִשְׂרָאֵל חַי |
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zerotofifty
Samba Member
Joined: December 27, 2003
Posts: 3756
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| Posted: Wed Jul 02, 2025 8:59 am Post subject: Re: Transaxle Oil |
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Side plates, which lart do you refer to, the steel parts to which the boots are attached? The cast magnesium parts to which the steel is attached?
I doubt oil type you used is the cause.
From the 1966 thru 1969 Factory Bentley manual...
The standard manual transmission requires 6.3 US pints for initial fill, and 5.3 US pints for refill ( 1 US pint remains inside upon draining), AND..
The fill level should come up to the filler hole
Assure the vent is not blocked.
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Give Peace a Chance.
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Bielakt13
Samba Member
Joined: August 11, 2024
Posts: 41
Location: Chicago
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| Posted: Wed Jul 02, 2025 9:08 am Post subject: Re: Transaxle Oil |
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The steel plates that mount to the side. I am actually seeing the oil on the nuts that tighten down the plate. Not leaking out the side of the plate.
I was not aware there is a vent hole, i assume this is located on the top of the trans? |
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OldSchoolVW's
Samba Member
Joined: July 03, 2020
Posts: 1411
Location: San Diego
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| Posted: Wed Jul 02, 2025 1:00 pm Post subject: Re: Transaxle Oil |
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| Bielakt13 wrote: |
| I was not aware there is a vent hole, i assume this is located on the top of the trans? |
I don't believe this is the nose cone for your transmission, but you can see where it is typically found. Near impossible to get to with the transmission installed. Since just rebuilt, it wouldn't be clogged up internally, but maybe they put some tape over the opening or stuck a plug in it to keep out contaminants during shipping?
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Tom
"Following distance is proportional to IQ."
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'63 Beetle Sedan
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Bielakt13
Samba Member
Joined: August 11, 2024
Posts: 41
Location: Chicago
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| Posted: Wed Jul 02, 2025 1:05 pm Post subject: Re: Transaxle Oil |
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| Thank you! |
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zerotofifty
Samba Member
Joined: December 27, 2003
Posts: 3756
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| Posted: Wed Jul 02, 2025 4:29 pm Post subject: Re: Transaxle Oil |
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A stiff bent steel wire can be used to clear the vent hole. A flash light and mirror can be used to assist, it is tucked up high near the body.
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Give Peace a Chance.
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mukluk
Samba Member
Joined: October 18, 2012
Posts: 7452
Location: Clyde, TX
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| Posted: Thu Jul 03, 2025 11:45 am Post subject: Re: Transaxle Oil |
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A blocked vent shouldn't cause trans fluid to leak out of the side plates. Out of the input or axle shaft seals yes, but not the side plates. The only reason the side plates would leak is if they are poorly sealed.
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Bielakt13
Samba Member
Joined: August 11, 2024
Posts: 41
Location: Chicago
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| Posted: Thu Jul 03, 2025 11:48 am Post subject: Re: Transaxle Oil |
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| appreciate the info |
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