WHY DOESN'T TRANY SHIFT WHEN IN 4 LOW
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WHY DOESN'T TRANY SHIFT WHEN IN 4 LOW
I converted a 1992 F-250 from 2 wheel drive to 4-wheel drive.
The donor truck was a 1991.
Everything seems to work but transmission will not shift when in 4-low.
What did I miss???
The donor truck was a 1991.
Everything seems to work but transmission will not shift when in 4-low.
What did I miss???
Methanoholic
Joined: Mar 2009
Posts: 6,442
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From: Maine (NorCal Native)
I suspect the 92 uses the VSS in the rear end, I suspect the E4OD believes it's going to slow to shift.
What to do about it, I'll leave that up to the folks that know these trucks much better than I ...
-Enjoy
fh : )_~
What to do about it, I'll leave that up to the folks that know these trucks much better than I ...
-Enjoy
fh : )_~
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
There is a range switch on the t-case that is supposed to connect to the PCM to tell it when low range is engaged, but I don't believe a 2wd PCM has an input for the range switch so...
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I was able to plug in the wiring harness from the transfer case to the 92's wiring harness.
Checked on part #'s (12B565) for the controller and Ford is showing the same one for 2 wheel drive and 4 wheel drive for both 91 & 92 model years
Checked on part #'s (12B565) for the controller and Ford is showing the same one for 2 wheel drive and 4 wheel drive for both 91 & 92 model years
Posting Guru
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From: Menifee, CA
PCM is the same for 2wd or 4wd
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No the dash does not light up for 4 wheel drive or 4 Low.
Since this is a 2 wheel dash would it have the lights to do so?
Since this is a 2 wheel dash would it have the lights to do so?
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Fleet Owner
Joined: Oct 2005
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From: Kentucky
Base model instrument cluster:
Optional cluster w/Tach
The Low Range signal tells the computer to shift the transmission at a lower speed IIRC.
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Fixed it!!! with a different (1995) transfer case wire harness.
1991 transfer case wire harness uses a different port to send the LOW/HIGH indicator message on than the 92 does. This is because the 91 has a extra VSS on the Transfer case.
1991 transfer case wire harness uses a different port to send the LOW/HIGH indicator message on than the 92 does. This is because the 91 has a extra VSS on the Transfer case.
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spinrbait
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Oct 15, 2009 12:54 AM