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1965 Sedan, 1969 convertible, 71 Fleetwood, 74 Coupe
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77 Posts
Discussion Starter #1
Im scratching my head on this one, how can ATF be leaking from the universal joint but not from the rear seal. I have checked for leaks on the whole gearbox, rear seal, dipstick tube, both cooler lines, etc and i cannot see where its coming from. Any ideas please.
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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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68,478 Posts
That front universal incorporates the splined yoke - with the polished seal surface on the outside. Absent any seal leaks there must be a casting porosity in the yoke itself.
 

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1965 Sedan, 1969 convertible, 71 Fleetwood, 74 Coupe
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77 Posts
Discussion Starter #3
I can lay under the car and literally watch it drip, its leaking that much.
 

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84 Coupe w/500
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5,665 Posts
Not sure on this car but some rear tranny shafts have a seal on the shaft itself to seal the inside of the yoke. Maybe this is one.
 

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1965 Sedan, 1969 convertible, 71 Fleetwood, 74 Coupe
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77 Posts
Discussion Starter #5
Not sure on this car but some rear tranny shafts have a seal on the shaft itself to seal the inside of the yoke. Maybe this is one.
I think you maybe right, reading on the internet, there is a vent hole in the end of the slip yoke, there is a O ring on the splined output shaft that stops ATF getting inside the slip yoke, if this O ring goes bad, fluid leaks out of this hole and into the universal joint. Most people either weld it up or put a bolt or screw in it.
 
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