Re: leaking th400
Are you using the oem dipstick and tube or an aftermarket ? Even with a deep pan I believe the fluid level should be below the pan rail. If it’s an aftermarket dipstick try draining the pan so the oil level shows about 1/4 up the dipstick cold. Then go for a test drive heat cycle the trans and recheck to see if the oil level is at full when hot.
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