OD "Lock" versus OD "Lockout" - Ford Powerstroke Diesel Forum
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Old 05-19-2007, 11:19 PM
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Smile OD "Lock" versus OD "Lockout"

Let's see if I've got my terms and understanding right...I'm looking at ways to preserve my E4OD, and these are two things I've run across:

There's "TC Lock" which is a mod that will lock the TC in OD and not let the TC unlock. Does this mod, when active, still allow the transmission to downshift out of OD?

There's "OD Lockout" which is what the OD button does, i.e. it won't let the transmission go into OD. There are kits you can install which makes this the 'default' condition, and when active, such a kit will not let the tranny enter OD without any other intervention by the driver.

Does this sound about right? Any and all insights will be appreciated... Thanks!

Alan

Last edited by AlanS; 05-19-2007 at 11:56 PM.
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Old 06-16-2007, 08:46 PM
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I have the TC Lock switch for when the EBPV is activated for braking. It prevents the TC from unlocking. Which in turn does not allow it to downshift. I have stalled my truck coming to a stop with it on. Not a good thing.

As for the OD lock out. when I tow, I always turn the OD OFF. as for normal driving, I would beleive that the lower RPM's would be better for the tranny. I know it helps for fuel economy.
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Old 06-16-2007, 09:14 PM
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Quote:
Originally Posted by AlanS View Post
Let's see if I've got my terms and understanding right...I'm looking at ways to preserve my E4OD, and these are two things I've run across:

There's "TC Lock" which is a mod that will lock the TC in OD and not let the TC unlock. Does this mod, when active, still allow the transmission to downshift out of OD?

There's "OD Lockout" which is what the OD button does, i.e. it won't let the transmission go into OD. There are kits you can install which makes this the 'default' condition, and when active, such a kit will not let the tranny enter OD without any other intervention by the driver.

Does this sound about right? Any and all insights will be appreciated... Thanks!

Alan
The first one you mention just keeps the TC locked up under deacceleration, used to aid in braking when slowing down like was said before it works well with the DIY exhaust brake.

The second one is just a comand to the tranny to not allow it into OD, used when towing to keep slippage to a minimun which in turn lowers tranny temps.
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