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Old 12-28-2025, 08:48 PM
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chuckies76ta chuckies76ta is offline
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Join Date: Jun 2004
Location: Alberta
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This is my understanding of when a th400 transmission is full. Since you marked the new dipstick that's your full mark. You need to get the fluid hot to take full measurement. Engine running , transmission in park.

For a TH400 transmission, the "full" mark on the dipstick is typically at the pan rail (the seam where the pan meets the transmission case) when the engine is running and hot in Park..

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68 Firebird. IA2 block, 505 cu in, SD Performance E-head, Solid roller 3600 weight. Reid TH400 3:90 gear. 28" slick.
Best so far 9.95@135 mph. 1.39 60 ft.
76 Trans am, TKX .81 o/d, 3.73 Moser rearend,
468 with KRE D-ports, Doug headers, 3" Exhaust
950 Quickfuel.