I'm also interested in hearing responses for this one. My 81 300 SD sometimes will try to reverse and then stop like it is trying to go forward also(like it is in two gears at once). Other times it works just fine.

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1971 R600 Mack toterhome (SuperDawg)
99 NU-WA Snowbird 34+2 SE 102 5er
If it's not diesel, it's not in my stable!
53 F100 617.951/auto
95 Dodge 3500 Cummins/5 speed service truck