winterset Posted May 12, 2015 Report Share Posted May 12, 2015 I have a 4T65E in a 13yo chevy minivan, and the 4T80E in my '96 Deville. I pumped out the old original fluid about a year or 2 ago from both and filled each with ~12 quarts of Dexron VI. The chevy added about 20k, and my caddy added about 1k miles. I noticed on both, under hard acceleration, and under load (carrying passengers), or a mild incline, when the car shifts at some point, a faint chirp can be heard. Has anyone else experienced this? I know both cars enough that i can hear and feel when the car is going to shift, so i ease up on the accelerator at that point, wait for the shift, then resume acceleration. When i drive with that technique, i don't get the chirp. I am hopeing it is the trans breaking in with the new fluid. Both drive and shift smooth, and no trans issues at all. I recall the Caddy had 111,000 and the chevy had about 115,000 when the original fluid was changed. Both never had any work, or were ever used for towing, or driven in mountain areas, and neither ever overheated the trans. Both had very little debree in the pan when i cleaned it out. Also filters were both replaced along with the gasket. Fluid levels are on the line when hot and in neutral. Quote Link to comment Share on other sites More sharing options...
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