Editing TH350 rebuild tech (section)
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==Low-reverse piston install== The first item to go in the case will be the low/reverse apply piston. Its function is for oil to force it towards the front or bell housing side of the trans, applying the low/reverse clutches. This allows reverse when applied simultaneously with the direct (high gear) clutches, and allows manual low gear when applied with the forward clutches. Manual low gear creates engine braking on deceleration. The low/reverse clutches do not apply in automatic range 1st gear. The low sprag (low roller clutch actually) causes first gear when only the forward clutches are applied. In the rare application that does not need reverse or low gear engine braking, the low piston and low clutches can be deleted and the feed holes in the case blocked. Install new seals on the low piston, these are square cut seals, not lip seals. [[File:T-350_low_piston.jpg|thumb|300px|left|T-350 low-reverse piston has three seals on it, creating two separate sections]] <br style="clear:both"/> Then push it into the rear of the case evenly by hand, aligning it properly so it will seat (there is a "tang"). Look at the park pawl notch to help index it. [[File:T-350caselowpiston.jpg|thumb|300px|left|T-350 low-reverse piston installed into case]] <br style="clear:both"/> Then install the return spring and retainer using the tool pictured. [[File:T-350_low_pist_springtool.jpg|thumb|300px|left|Tool used to compress the springs and retainer to install the retaining snap ring]] <br style="clear:both"/>
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