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I had a auto 3 spd make clunking sounds and jerky acceleration. Turned out to be the bearing to the final drive (Ring & Pinion) tranny seals had leaked to the poin there was no more diff. lube and bearing went dry and failed. I did'nt figure it out till it locked up at 30 MPH errrrt. At least it was'nt 60. Drain and fill rear portion of tranny and refill and see if it improves somewhat. If so you will need to tear down and replace bearing. Just a thought and an 89 prob. could use a refill. I don't know what the maint. was but lots of people A) Never change the tranny fluid at all or B) don't change the diff. fluid when they do. Not accusing just asking. And I'm not saying fo sure thats it. With Autos it could be a number of things, but this is diagnosible.
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