07-14-2019, 04:59 PM
Our '86 has an Allison four speed with Stone Bennett shifter , hydraulically activated. Started having an intermittent problem shifting from neutral to drive during a 700 mile trip Friday . Twice it also would not go into neutral from drive , so I had to manually move the lever at the trans . Problem seemed to worsen as the day got hotter .
I can't see anything obvious at the trans shifter station , and the toggle shows voltage on outputs when moved forward and back . The shifter has an accumulator which has a Schrader valve on it . I am wondering if this should have air pressure . It seems like it should , but I want to be sure before trying to add air . Trans shifts fine , no slippage .
Anyone have any info on these shifters ?
Thanks , Chris
I can't see anything obvious at the trans shifter station , and the toggle shows voltage on outputs when moved forward and back . The shifter has an accumulator which has a Schrader valve on it . I am wondering if this should have air pressure . It seems like it should , but I want to be sure before trying to add air . Trans shifts fine , no slippage .
Anyone have any info on these shifters ?
Thanks , Chris
1986 #89
VIN 007
Detroit 8V92 TA 475 HP
Allison four speed
Chris and Sharon Hand