4L60E Anti Clunk Spring Installation3/12/2021
Also be sure on dis-assembly you inspected and replaced as necessary the input shaft to output bushing shown here(red arrow).The TH350 was still produced many years beyond 1986 for export sales.It is a relatively rugged, compact transmission that lends itself to a wide variety of applications and modifications.
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That said, the following should help give a better understanding of the TH350 and possibly help when a question arises. Look for the end of the input shaft to have a smooth polished end with O-ring on it, similar in appearance to the 200C2004R and 700R4pre-LSx 4L60E. The case has a C cast into it, and there will be an electrical plug adjacent to the shifter shaft on the driver side of the tranny. Same also holds true with the oil pump - C is cast into the pump cover and pump half. This is a pressure switch that was used 1972-73 for the Transmission Controlled Spark (TCS) system. This disabled the distributor vacuum advance in all gears except high gear, and is a single wire switch threaded into a pressure port near where the cooler lines are located. In the case of this switch, you can either leave it in place, unused- or remove it and plug the port. ![]() Might as well order a bushing kit, as well as a thrust washer kit. It is also recommended to get two additional sun gear bushings individually. 4L60E Anti Clunk Spring Ation Professional Builders HaveThe plastic sleeve design is very durable, you will find professional builders have their own preference. One reason is the accumulator protects the failure-prone intermediate sprag and another is the spring keeps the cover loaded against the snap ring. Photo shows accumulator cover, spring and piston (snap ring not shown). Check the bore in the case for scratches or other damage if the spring was found broken. You will see pressure here in all gears for most valve body configurations. Some race-only valve bodies may not have pressure at this port or the others. Its function is for oil to force it towards the front or bellhousing side of the trans, applying the lowreverse clutches. 4L60E Anti Clunk Spring Ation Manual Low GearThis allows reverse when applied simultaneously with the direct (high gear) clutches, and allows manual low gear when applied with the forward clutches. The lowreverse 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.
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