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Stone Bennett shifter
#1

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

1986 #89
VIN 007
Detroit 8V92 TA 475 HP
Allison four speed 
Chris and Sharon Hand
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#2

if you do a search on the forum you will find info about it. btw, it is air operated and not hydraulic.

quite a few gurus have worked on them. there is a place in texas that rebuilds them as well.

tom

2002 45'8" Newell Coach 608  Series 60 DDEC4/Allison World 6 Speed HD4000MH

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#3

Actually there is no air going to the shifter . There is a line from the trans to the shifter via the accumulator,  and another back to the sump . Tim kindly sent a manual that covers this particular shifter including the accumulator pressure , 90 psi . So far today the shifter is working , 500 or so miles to go , hopefully we can get to the barn as is . We have nitrogen in the trailer , I can fill accumulator if needed .
Thanks for the response ,
Chris

1986 #89
VIN 007
Detroit 8V92 TA 475 HP
Allison four speed 
Chris and Sharon Hand
Reply
#4

I had T H Anderson Pump Co. , Kilgore, TX Rebuild my Stone-Bennett shifter . They were great! 800-594-7867.

1993 Newell (316) 45' 8V92,towing an Imperial open trailer or RnR custom built enclosed trailer. FMCA#232958 '67 Airstream Overlander 27' '67GTO,'76TransAm,'52Chevy panel, 2000 Corvette "Lingenfelter"modified, '23 Grand Cherokee.
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#5

T. Anderson was so amazing! The man KNOWS these shifters. He was real nice & fun to talk to. He explained the process of rebuilding it myself & encouraged me to do it.

All things considered, the prices were very fair.

Good luck with your shifter!

1987 classic #159
8V92 MUI , Allison 740
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#6

Shifter update , checked trans fluid level yesterday morning.  To my dismay and embarrassment the fluid was just touching the stick . Three qts ATF brought the level into the safe range . There were no shifting problems during the 700 mile trip home . I should note that the trans always shifts/pulls well , the shifter is actually a gear selector . When we had problems Friday ( mostly the N to D shift ) it was very hot and we got stuck for hours in a traffic snarl on I 65 N at E Town ,Ky . Perhaps heat soak compromised fluid pressure to shifter . We were also experiencing an overheating problem,  about which I will post another thread .
I have found T. Anderson to be a very good outfit . Sourced information and parts from them when I went through the gear position indicator components .
Thanks for the input !
Chris

1986 #89
VIN 007
Detroit 8V92 TA 475 HP
Allison four speed 
Chris and Sharon Hand
Reply


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