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PostPosted: Thu Jun 02, 2022 1:49 pm 
3 Deuce Webber
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Joined: Wed May 02, 2007 4:03 pm
Posts: 75
Location: Passssssssadena, California
Car Model: 1981 B-150 original California short passenger Van
1989 (when i purchased my 1981 van used)-2016: apart from a brief dipstick leak around time of purchase which was resolved, no issues.

2016: Changed transmission fluid (ATF+4) and filter. Installed re-usable gasket 2464324AC with special bolts 6036402AA. Worked slowly and carefully, tightening bolts to spec.

Over the past several years i’ve noticed leaking transmission fluid from around the gasket/pan edge, especially at the front passenger corner:
transmission oil leak.JPG
transmission oil leak.JPG [ 249.5 KiB | Viewed 676 times ]

Some bolts were loose. Retightened to spec. Do they need thread locker or something?

Leak persists. It’s become much more severe than in the photo: the cardboard was discolored over a very wide area directly under the transmission pan, with a red tint, not brown like motor oil.

Transmission works fine unless the fluid gets too low. Prior to 2016 i never had to add transmission fluid; now i occasionally must.

What am i missing? What do i need to check/do?

~ Thanks ~

1981 B-150 short Van, stock 225, California emissions package, Electronic Spark Advance (digital Lean Burn), Non-feedback Holley 1945, AT
Driven for economy, not for speed.

PostPosted: Thu Jun 02, 2022 5:53 pm 
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Joined: Thu Oct 31, 2002 5:39 pm
Posts: 24010
Location: North America
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The updated trans pan is much sturdier than the earlier pans, and good and flat along the gasket rail (older pans are often distorted by overtorqued bolts together with the old squishy gaskets). Plus it has provisions for a doughnut magnet to catch and sequester metal shavings.

Too many people who were born on third base actually believe they've hit a triple.


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