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TRANSMISSION REVERSE FAIL 900 1994

posted by  Kbrow on  Sat Jan 28 01:35 CST 2023
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AW-71L failed (reverse only) after being put into reverse with a racing engine (2000 RPM, due to bad vacuum leak). First and all forward gears drive fine, except engine RPM at 65 mph highway speeds is about 1000 RMP too high. Overdrive solenoid switch works fine from from 3 to 4, but RPM seems excessive in overdrive (trans not slipping).

Cannot believe that strain from shifting hard into reverse about 3 times at 2000 RPM would cause loss of reverse only, when 1st gear is fine and responsive.

Could a trans valve body ball blockage cause this? Or is a govenor pressure solenoid (or pressure sensor) implicated? I don't know what activates reverse gear.

Has been driven with full synthetic fluid and clean filter the last 50 miles, so I wouldn't normally expect dirty fluid to be the problem.

Sure need reverse back!






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