Pump Archives - Transmission Digest
Ford 8F35 maintenance tips: Planetary failure and no-pressure conditions

Our shop has had several vehicles come in with the Ford 8F35 transmission having planetary failure. Apparently, there was a run where the pinion needle bearings had a hardness problem (see Figure 1). Ford has a bulletin out (bulletin number 22-281), which provides a part number for this planetary assembly: the part number is JM5Z-7N473-C and

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10L80 and 10R80 pump gear differences

You may have seen an article in the August 2023 issue of Transmission Digest called “GM 10L80: A new kind of pump noise,” which goes over how the front cover housing in the 10L80 is fitted with a converter drive gear and idler gear. The idler gear drives the pump’s driven gear, and is press

ATI introduces pressure regulator valve, boost valve kit for T400

ATI Performance Products has introduced a new solid pressure regulator valve for GM T400 pumps (part no. 4050120) and a boost valve kit for the T400 (part no. 405136). Both parts are new OEM style replacements and will work with OEM and aftermarket mating parts with no modifications, the company says. The pressure regulator valve

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GM 6L series no-movement conditions: Analysis and repair tips

I am certain that many have experienced a no-movement forward, no-reverse or abnormal pressure condition with a GM 6L series transmission, especially since they are one of the most popular unit families in shops today. So, let’s examine some conditions and causes along with a few diagnostic tips for troubleshooting. We’ll go through a few

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