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AODE lost 4th gear w/o warning

Tiny
DRIVEBYTRUCKER
  • MEMBER
  • 1994 FORD F-150
  • 200 MILES
'94 5.0 F150 with fresh engine (off road). All emmissions, EEC, EFI, etc. Removed/replaced. Now carburetor, with Optishift trans controller.
Trans has always shifted great. While traveling, 4th gear went away, still have 3-4 upshift, but RPMs freewheel in 4th as if there's no line pressure. It will downshift back to 3rd when I slow down. All other gears/reverse are good, just no 4th. Replaced fluid when I replaced the clutch lockup solenoid as part of the Optishift installation. Fluid still smells fresh.
Verified that the new trans contoller is functioning properly.
COuld it be an electrical/mechanical breakdown? A solenoid failure?
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Sunday, August 28th, 2011 AT 3:27 AM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Have a trans pro look at this, it may be you have a bad seal or burnt a clutch pak up. Or it may be something simpler. Although it sounds like an internal trans problem.
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Sunday, August 28th, 2011 AT 1:52 PM
Tiny
DRIVEBYTRUCKER
  • MEMBER
  • 2 POSTS
"sounds like an internal trans problem". Really?
-I'm thinking burned clutches would create scorched smelling fluid, wouldn't it?
-Would a seal failure affect more than high gear? Like maybe reverse and high?
Is there anyone available at this site that has experienced this particular sympton on an AODE?
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Monday, August 29th, 2011 AT 11:03 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
The front clutch is for the OD gear and if it fails, you would not have any 4th speed. Others gears would not be affected. A bad seal is more likely to be the cause and it is internal.

When seals fails, you might not have any burnt smell with the fluids. The only way to confirm is to perform a pressure test on the 4th speed hydraulic circuit.
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Monday, August 29th, 2011 AT 1:02 PM

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