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Old 01-08-2020
lucaswillemse's Avatar
lucaswillemse lucaswillemse is offline
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Join Date: Jan 2008
Location: Paramount
Posts: 459
Default Alison 4060 Transmission modification

I followed up with W.W.Wiliams in Phoenix and they can do the Alison Mod to stop the downshift to 4th gear when using the jake brake. Their cost is $215.00 per unit. However their charge for portal to portal is over $1500.00 It will be cheaper to just drive to Phoenix for this update.

Has anyone ever just disconnected the signal going to the transmission to tell it to shift down to 4th?
Lucas Willemse
Paramount, CA
1995 WB 42
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Old 01-08-2020
Randy Dupree's Avatar
Randy Dupree Randy Dupree is offline
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Join Date: Dec 2007
Location: Port St Joe,Fl
Posts: 37,015

Ed Wimberlys speed sensor went bad and he had to be towed home,i don't think your plan will work!
email me at randy@randydupree.com only.

Randy Dupree
2000 LXI 43
Port St Joe Fl.

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Old 01-08-2020
Ed Wimberley's Avatar
Ed Wimberley Ed Wimberley is offline
95 WB 42
Join Date: Aug 2008
Location: Perry Georgia
Posts: 2,925

You most assuredly will not like it disconnected. It can and will refuse to shift into 6th gear. I could limp home with that 45mph is sorta ok.
However while attempting to limp it home it decided to shift into FIRST gear at 40 + mph NO NO NO Could have ripped entire drive line out. Slowly very slowly I crawled up the exit ramp and called for a tow.
New speed sensor scheduled to arrive Jan 13.
HD 4060P needs sensor # 29544139

1995 WB 42 Series 60
Perry Georgia
770-548-1441 cell
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