There are Four primary issues to be delt with. The gear you have wotked on is one of them. The second is worm endplay. The cap at the gearbox front (where the worm gear would come out) is covering a ball bearing. This bearing is a deep groove bearing designed to take all steering forces as the sector tries to move the steering shaft (attached to the steering wheel) back and forth. This bearing wears and can be a problem. Check it by turning a bit of strain to the right on the steering wheel. Then make a mark with a felt tip marker where the shaft goes into the gearbox. Now put force on it to the left. The mark will turn with the shaft, but it should not come out toward the driver, or in and dissapear. If either happens, it is an indication that the bearing mentioned above it toast. The bearing is a good number, and common at a bearing store. Do not use a cheap bearing here!!! Next is the bolster shaft (the shaft that the sector is mounted to) this has a bushing at the top, a ball bearing about the middle, and a bushing at the bottom. These are all replaceable and available. The shaft may be worn. It is OK if less than .001" is measured wear. Welding it and turning the shaft is best practice.
Lost motion in the universal joint at the midpoint of the steering shaft is the laast looseness check. There are replacement Ujoint "crosses" Trunions that can be used on some. Others might need to be replaced as a unit. Jim
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