Editing TH350 rebuild tech (section)
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=Valve body= ==Valve body gasket check== Always check the valve body gaskets against the separator plate to see if any holes in the plate are covered by the gasket. Place the gasket behind the plate and hold both up at light to check for covered holes. [[file:T-350_v-body_gasket01.jpg]] This gasket on a T-350 sits against the valve body. Notice the open line in the gasket that will parallel the support plate that bolts on at front of the valve body. [[file:T-350_v-body_gasket02.jpg|frame|none|Notice the open line in the gasket, this gasket installs against valve body, not the case]] ==Valve body modifications== Removing check balls and opening up orifices in the separator plate is a common modification to firm up shifts. Just remember the one check ball that needs to stay is the one just below the modulator. ==Separator plate== Below is a picture of the feed holes. These regulate the amount of fluid, or how fast it can apply the clutches. Drilling them bigger allows a faster apply. However, bigger is not always better. [[file:T-350feedholes.jpg]] Remember that as the load increases on the trans, so does the pressure. The increase in pressure will cause the fluid to move faster and shifts to be firmer. If you drill the holes ''too'' big the shifts become too harsh at light throttle openings. This causes undue wear on the internal transmission parts, rear differential and axles, drive line and u-joints. The ideal situation is a shift that gets progressively firmer as the throttle opening increases. Drilling the 2nd feed hole to 0.125" and the 3rd feed hole to 0.125"-0.140" works well for many applications. Also note above the 2-3 accumulator hole marked in the upper portion. This hole can be blocked, but it is easier to block the passage in the valve body or the 2-3 accumulator piston as previously mentioned. ===Shift kits=== Often shift improver kits are installed at the time of the tranny rebuild. Various manufacturers make shift improver kits, TransGo has a good reputation. ==Racing valve body== Coan reverse manual valve body. Notice the machining of passages. Please note the DIY cannot just mill the valve body as valves have also been changed in the valve body. [[file:T-350reverseVB.jpg]]
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