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Discussion Starter · #1 ·
I have had three of my TH700R4 filter seals fail within only 250 miles which resulted in burned 3-4 clutches each time. One of the filters was made in China, another was a Filtran and the other was a WIX.

When these seals fail the first symptom is the failure for the converter lockup to work and then the 3-4 clutches start slipping. Upon removing the filter I find the seal's internal and external ribs had flattened to the point in which they failed to seal so the pump sucked in air.

The solution is to replace that orange seal with three 3/32" X 11/16" X 7/8" Viton o-rings (although neoprene o-rings will also work). The o-rings are a bit harder to compress but they will retain their tension and provide 100% sealing.
 

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Discussion Starter · #3 ·
it must be a fairly recent change in seal materials, because mine is 4 years old and I ve never had any problems at all in my 700r4

The problem is there's no way of knowing if you have one of the defective seals as they appear identical in every way. So it's best to simply use 3 o-rings as they will seal.

On my urging Pro Built Transmissions is now including 3 Viton o-rings in their rebuild kits.
 
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