This trany has a reputation for being delicate in BMWs. They seem to fail around 100-120,000 miles. Anyone know why? I change my fluid and filter every 30,000 or so. Others may not. TIA
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Russell, the 4L30E was also used in the Cadillac Catera, the Isuzu Rodeo, Trooper and Axiom. The Isuzu's were heavy offroad worthy 4x4's and the transmissions held up as good as any modern day unit (had 4 Zu's in the family). Faulty range sensors can cause grief and give shady shops an excuse to replace the trans. The range sensor is just bolted to the shift linkage and a super easy R/R, the other issue is lack of maintenance. Around ~1996 Isuzu took the ATF dipstick away from the 4L30E which made servicing way more of a challenge. If these units are run low on ATF, they do die very quickly.
Joel