zf swap, no 4 low - Pirate4x4.Com : 4x4 and Off-Road Forum

ragnarbronco · 01-07-2012, 10:40 PM

i've been searching for the last 3 months on an answer to this. i swapped in a zf to my bronco....got it running so i can drive it to work daily. 4hi works (i have an electric tcase). cant afford to swap in a manual tcase right now. how do i wire it so the tcase will shift into 4low when i need it?

1badb2 · 01-08-2012, 06:37 AM

sounds like this is the same case that was in your bronco previously.

Did it not shift before?

PowerStrokeTim · 01-08-2012, 06:53 AM

There is a red wire with a white stripe that goes to the park neutral or manual lever position switch that was on the side of the old automatic (Im assuming you swapped the zf for an auto). If you ground that wire it will make the 4wd module think the trans is in neutral and will allow the 4lo shift to happen.

Just make sure you're stopped idling in neutral or with the clutch in before you try to shift so it doesn't tear the transfer case out when you hit the 4lo button. That wire can also be wired to a clutch safety switch if you want to make it work more like factory.

ragnarbronco · 01-08-2012, 02:06 PM

thanks. got it figured out. the red/white wire has to be ungrounded to shift into 4hi and then grounded to shift into 4low. not sure why but when grounded and hit 4hi it does the normal clicking but no shifting. ungrounded it shifts. so im just gonna wire in a simple switch so that i can ground and unground it at will. now if i can just find someone close by with a welder......

01-07-2012, 10:40 PM	#1 (permalink)
ragnarbronco Registered User Join Date: Feb 2010 Member # 154572 Location: colorado springs Posts: 32	zf swap, no 4 low i've been searching for the last 3 months on an answer to this. i swapped in a zf to my bronco....got it running so i can drive it to work daily. 4hi works (i have an electric tcase). cant afford to swap in a manual tcase right now. how do i wire it so the tcase will shift into 4low when i need it? __________________ 93 bronco, SAS'd 44, 10.25 swap, 35's, homebuilt hidden winch mount, smittybilt 12,000lbs winch

01-08-2012, 06:37 AM	#2 (permalink)
1badb2 IDIot Join Date: Mar 2005 Member # 44595 Location: Denvergrad Posts: 1,143	sounds like this is the same case that was in your bronco previously. Did it not shift before? __________________ Rats get fat, while brave men die. Spare parts? If you're shooting your weapon to failure, it means you're really good to have stayed alive through that much combat. You're not fucked, You're just down a weapon, go get another off of one of the many dead bodies you created

01-08-2012, 06:53 AM	#3 (permalink)
PowerStrokeTim Newbie Join Date: Oct 2005 Member # 55462 Location: Fayetteville, NC, USA Posts: 41	There is a red wire with a white stripe that goes to the park neutral or manual lever position switch that was on the side of the old automatic (Im assuming you swapped the zf for an auto). If you ground that wire it will make the 4wd module think the trans is in neutral and will allow the 4lo shift to happen. Just make sure you're stopped idling in neutral or with the clutch in before you try to shift so it doesn't tear the transfer case out when you hit the 4lo button. That wire can also be wired to a clutch safety switch if you want to make it work more like factory. __________________ 2003 F250: 6.0 PSD, 6spd, 35" tires, Tow rig/DD 1978 F150 Truggy: 351M with GM TBI, 4spd, ARB'd 60, 4 linked 14bolt rear, 42 TSLs 1967 Fairlane GT: worked over 390FE, factory 4 speed, cage, etc.

01-08-2012, 02:06 PM	#4 (permalink)
ragnarbronco Registered User Join Date: Feb 2010 Member # 154572 Location: colorado springs Posts: 32	thanks. got it figured out. the red/white wire has to be ungrounded to shift into 4hi and then grounded to shift into 4low. not sure why but when grounded and hit 4hi it does the normal clicking but no shifting. ungrounded it shifts. so im just gonna wire in a simple switch so that i can ground and unground it at will. now if i can just find someone close by with a welder...... __________________ 93 bronco, SAS'd 44, 10.25 swap, 35's, homebuilt hidden winch mount, smittybilt 12,000lbs winch

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