Transfer case fluid change,differentials oil change - Page 3 - Diesel Forum - TheDieselStop.com
'99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the '99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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post #31 of 33 (permalink) Old 07-11-2018, 10:42 PM
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Originally Posted by klhansen View Post
I'm at 215k miles, and run all winter with the hubs locked in, so my t-case gets abused a bit, turning all winter long whether in 4x4 or not, and it hasn't grenaded on me yet.
I run with my hubs locked all year long and only unlock them when I'm going to be on a trip over 250 miles out on paved highway. I have 335,000 miles on my original transfer case. Im either having a mind-block or missing something but why would simply having the hubs locked be abusing your transfer case? I just manually shift the transfer case in and out of four wheel drive as I need it. I've always assumed that while the transfer case is not shifted into four wheel drive that my transfer case is not doing anything but going along for the ride....not "turning all winter long" like you mentioned. I'm not sure if I'm communicating this correctly so I hope I'm not sounding argumentative but rather trying to understand better. Thanks.
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post #32 of 33 (permalink) Old 07-12-2018, 03:43 PM
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Originally Posted by losfinch View Post
I run with my hubs locked all year long and only unlock them when I'm going to be on a trip over 250 miles out on paved highway. I have 335,000 miles on my original transfer case. Im either having a mind-block or missing something but why would simply having the hubs locked be abusing your transfer case? I just manually shift the transfer case in and out of four wheel drive as I need it. I've always assumed that while the transfer case is not shifted into four wheel drive that my transfer case is not doing anything but going along for the ride....not "turning all winter long" like you mentioned. I'm not sure if I'm communicating this correctly so I hope I'm not sounding argumentative but rather trying to understand better. Thanks.
When the hubs are locked, the front output shaft of the t-case is being turned continuously by the front driveshaft, whether in 4x4 or not. The shift mechanism is in the top portion of the gearcase and when in 2WD, the upper chain sprocket is disengaged and it, the chain, lower sprocket, front output shaft and front driveshaft don't rotate.
I suppose "abused" was kind of a strong word to use, but with hubs unlocked, and in 2WD, there's less moving in the t-case, and less wear occuring. Granted the chain and sprockets aren't loaded, so there's less wear than in 4WD.
I guess what I was saying was that my lube choice hasn't caused issues even with the additional moving parts when hubs are locked in. Most guys with 4WD in less severe conditions (Ice, snow, etc.) likely run with hubs unlocked, especially those with auto hubs.
I wouldn't worry about your t-case.
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post #33 of 33 (permalink) Old 07-14-2018, 10:14 AM
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Hey thanks, that was a great explanation since I've never seen the internals of our transfer case.
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