I have an 86 Olds Delta 88 with the 3.8 v6 (believe it has the 440t4 tranny). Recently, I took it on a trip involving highway driving, before then its always been city. I went approximately 65 miles at 55-65 mph. I got off an exit to get a drink and bathroom break. When I went to get back on the highway, it wouldn't shift into a higher gear. When it gets up to 25mph,it just revs up. I changed the vacuum modulater and the fluid is at the correct level. What do you suggest could be the problem?
SOURCE: 1989 lincoln mark vll automatic transmission
you may have damaged the overdrive gear, a local transmission shop would be your best bet. for good troubleshoting and estimate.
SOURCE: which years/models trannys interchange 1990 olds delta 88 royale
any gm olds , buick caddy, pont, 4speed auto up to 1991 u just got make sure theyre not computer controlled some 91 are n some aint stay away from 84 to 88 they had failures it doesnt really matter about engine size as along its same transmission
SOURCE: transmission leak
Most likely problems described are not related. Rough idle and rough at low speeds could be caused by spark plug and wires due for replacement. Tranny pans known to leak and is an easy condition to remedy with filter and gasket replacement
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