Editing TH350 rebuild tech (section)
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==Rear planetary unit install== Next goes in the output planetary to output ring gear bearing or thrust washer (depending on year). Then the planetary unit. Replace the bushing in this planet.Check planet pinion gears for side to side movement. Clearance of 0.030" to 0.050" is common. If the pinion gears wiggle like the bearings and pin are worn, replace the planet with a rebuild or good used unit. [[File:T-350_rear_planet.jpg|thumb|300px|left|TH350 rear planetary unit with fresh busing installed]] <br style="clear:both"/> Now you can install the low/reverse clutches, beginning with a steel, then a friction, alternating, ending with a friction. [[File:T-350_low_clutch_install.jpg|thumb|300px|left|T-350 low-reverse frictions and steels installed with planetary and output shaft]] <br style="clear:both"/> {{Note1}}If you have a light duty core with low count low pack, unless it is a transbrake application or will be manually shifted into low for engine braking often, fewer clutches is OK. In some cases where you are after every last bit of ET, using fewer clutches can cause less frictional loss in 2nd and high gear. "Turbulator" steel plates from a 4L60E will also help and are a direct drop-in. There are Alto red frictions in this unit, however a stock tan clutch ( like Borg Warner brand) is more than adequate for even very high HP cars. A Hi-Energy Borg Warner friction from a 4L60E is also a good choice. Once the low clutches are installed, you can install the anti-clunk spring (or case-saver). Hold in place with assembly gel or vaseline and then install the low-reverse support. [[File:T-350_anti-rattle_spring.jpg|thumb|300px|left|Anti rattle (clunk) spring shown in correct location; use assembly grease to hold in place]] <br style="clear:both"/> Be sure the low sprag inner race is not brinelled or has any unusual wear. A center support from a 1987-present 700R4 or 4L60E (including the aftermarket case saver with a bolt-on outer plate held with torx head bolts) can be used in place of the stock center support since the roller clutch is wider. [[File:T-350_center_suport_sprag.jpg|thumb|300px|left|Photo shows center support with sprag (roller clutch) and inner race]] <br style="clear:both"/> The roller clutch must installed correctly with the edge of the roller clutch tangs match the inner receiving tangs of the center support. Install snap ring. There is a snap ring on both sides of the roller clutch. [[File:T-350_assembled_low_support.jpg|thumb|300px|left|Installed sprag (roller clutch), watch orientation of tangs into the center support housing]] <br style="clear:both"/> Once it is pushed into place, install the snap ring with the ends on each side of the spring or case-saver. Now is the time to air check the low clutches. You do so by applying pressurized air to the passage at the rear pan area of the worm casting in the case. Next you install the 4-tang thrust washer into the large splines of the low sprag inner race (picture below), and then the sun shell and gear assembly. [[File:T-350_center_support.jpg|thumb|300px|left|Center support, inner race, thrust washer shown]] <br style="clear:both"/> Before this step, for HD use, you would have installed additional sun gear bushings, there will be 2 bushings on each end, and re-drill the lube holes as shown below. [[File:T-350_sun_gear_bush.jpg|thumb|300px|left|Double bushings installed. You MUST drill oil holes in bushings]] <br style="clear:both"/>
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