00 F350 ESOF won't shift to 4L - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 12 (permalink) Old 06-02-2019, 02:53 AM Thread Starter
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00 F350 ESOF won't shift to 4L

Hi, I have a 00 F350 7.3 ZF-6 dually 4X4 that won't go into 4 low. It lights up 4 Low and 4x4 lights on dash before starting. It goes into 4 High and 2WD fine. Just refuses to go into 4 low. Replaced transfer case motor, selector switch, brake position switch, checked all fuses, relays click when shifting to 4 high and back to 2WD. Shift to 4 low and it stays in high. Clutch position switch or GEM module? Everything else works fine. The PVH has been blocked off due to bad hub seals but that shouldn't prevent it from going into 4 low? This is my first ESOF and I would rather fix it myself as opposed to taking it somewhere. Thanks
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post #2 of 12 (permalink) Old 06-02-2019, 12:49 PM
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Re: 00 F350 ESOF won't shift to 4L

On my 99 dually 4x4 with automatic transmission when first got it was not use to how they work and it would not go into 4 low neither. Then found out it had to be in neutral and push on brakes for it to go in. Goes in just find now.
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post #3 of 12 (permalink) Old 06-02-2019, 10:23 PM Thread Starter
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Re: 00 F350 ESOF won't shift to 4L

I have tried it several times while working with it in neutral with the clutch and brakes both pushed down and it isn't doing any good. I ordered the clutch position switch for it and I am going to try that. If that doesn't work, I guess I have to pull the GEM module and check it for corrosion. The windshield might have let it get wet, but it has since been replaced (the windshield). Everything else works on the truck but 4 low. I may try locking hubs in and moving a little and trying again but the guy I got the truck from never got it to go in 4 low either. I plan on keeping the truck so I don't mind replacing a few parts but I hate the idea of trying to find someone to program the GEM module. If I can find the parts later on to change over to manual shift transfer case I might do that later. My 84 f250 always shifts into any range with no problems. I miss the simple way of doing things that doesn't break. Thanks
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post #4 of 12 (permalink) Old 06-03-2019, 12:34 AM
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Re: 00 F350 ESOF won't shift to 4L

Sounds like you have a bad relay. There are two relays for the shifting.

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post #5 of 12 (permalink) Old 06-03-2019, 01:03 AM Thread Starter
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Re: 00 F350 ESOF won't shift to 4L

Sbluke55, it might be. I bought one new relay and tried it if I remember right in both spots. I might get another new one and just put them both in and see what it does. I have done mechanic work all my life but never touched an ESOF before this truck. I really like the truck and plan to keep it so I am going to fix it what ever it is but if it is relays that would sure beat buying a GEM module. One other question, is the front axle a Dana 50 or a Dana 60? I always thought all F350 duallys had D60's in the front with D80's in the back, but I heard that some had D50's in the front.
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post #6 of 12 (permalink) Old 06-03-2019, 01:40 AM
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Re: 00 F350 ESOF won't shift to 4L

I believe the earlier trucks had d50 and the later ones had d60's. My guess is you have a d50.

01 f-250, Standard
Rev tech 4" lift, 37" military wrangler Mt tires
KC diy 66, Full force 160/100 and custom tunes from PHP
Banks intercooler and full 4" exhaust, Diy S&B intake
Diy quad feed, Hydra, Isspro boost, pyro, and fuel pressure
3/0 battery cables with military style terminals
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post #7 of 12 (permalink) Old 06-03-2019, 02:13 AM Thread Starter
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Re: 00 F350 ESOF won't shift to 4L

Ok, it probably won't matter much unless I need to replace parts in it. I will see about getting another relay tomorrow and put them both in, maybe that will take care of it. I have heard where the relays connect underneath corrode also, I might check that while I am at it. Thanks
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post #8 of 12 (permalink) Old 06-03-2019, 01:40 PM
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Re: 00 F350 ESOF won't shift to 4L

The 60 can be readily identified by its straight axle tubes, 10 bolt asymmetrical cover, and a "60" cast in to the housing. 50 is cast into the 50 ones.
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post #9 of 12 (permalink) Old 06-03-2019, 02:06 PM
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Re: 00 F350 ESOF won't shift to 4L

Quote:
Originally Posted by Sbluke55 View Post
I believe the earlier trucks had d50 and the later ones had d60's. My guess is you have a d50.
My E99 has a 60 in it.
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post #10 of 12 (permalink) Old 06-03-2019, 07:08 PM Thread Starter
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Re: 00 F350 ESOF won't shift to 4L

OK, I put two new relays in for the 4x4 shift and it makes no difference, still only goes to 2wd and 4 high. I did look under truck and "248" is cast in front axle center web. I understand this to mean I have a D60? Thanks
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