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02-09-2018, 07:06 PM | #1 |
Senior Member
Join Date: Feb 2011
Posts: 253
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50 ford overdrive question
My Borg Warner OD unit whines while in the locked up, overdrive position. Engages and disengages fine and quiet as a church mouse while in freewheel mode (overdrive electricals removed temporarily). Today I removed the trans and knocked the tailhousing off. I don't see anything wrong. Rollers are smooth, the three little planetary gears look good and turn smooth, no shavings in the drained gear oil. I was running 90W oil. The tailshaft drum where the planetarys ride in also seems fine and where the rollers ride in the drum is smooth with no pits.
Any ideas? |
02-09-2018, 07:22 PM | #2 |
Senior Member
Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,436
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Re: 50 ford overdrive question
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Free wheeling was a necessary addition so that the overdrive could function properly but it does allow for some friction or braking action when you let off the throttle with the OD operational. Actual full engine braking only occurs when the overdrive is in the locked out position with the cable pulled out. As far as the electrical system, it's hot when ever the car is running even if the overdrive is locked out. The rail switch will keep the operating solenoid from functioning when locked out unless you have a later unit that doesn't have the rail switch. The shift rail will block the operating solenoid pawl when locked out but the solenoid is still functional electrically on those later units. Last edited by rotorwrench; 02-09-2018 at 07:29 PM. |
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