Transfer case reduction ratios

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Sep 29, 2000 | 09:39 PM

horsepuller

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From: Southern California

Transfer case reduction ratios

Whoo Hoo! First post in a brand new forum! :7
Just wondering what transfer case gear reduction ratios are. My '81 F-250 has a Borg Warner 1345, but I don't know what the ratio is. I'm thinking it's like 2.3:1, but I'm not sure.
If you know what your transfer case ratio is please post it here, regardless of the make. I think they are probably pretty much the same for full sized trucks.

Sep 30, 2000 | 07:52 AM

dinosaurfan

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Joined: Aug 2000

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From: SW Michigan

Transfer case reduction ratios

horse- transfercases are wonderfull things aren't they? One of mine, from the F100, is either in or out of four wheel, with one to one all the time, no low range. I prefer my NP 205's, which have a 1.96 to 1 in low range, I have never been able to hurt one. I'd be interested in knowing what everyone else runs, I've seen lots of advertizements for reduction gears or double T-cases for lower low range. When would you ever need or even want that? Regular low range has always been enough for me so far.How about you. DF

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Sep 30, 2000 | 10:24 AM

Kenny

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Joined: Jul 1999

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From: New Egypt, New Jersey

Transfer case reduction ratios

Hi there,
Mine is also 1.00:1 in high range, and it is 1.86:1 in low range. It is a 1959 F250 with the divorced type transfer case.

Sep 30, 2000 | 10:24 AM

Kenny

Cargo Master

Joined: Jul 1999

Posts: 2,484

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From: New Egypt, New Jersey

Transfer case reduction ratios

Hi there,
Mine is also 1.00:1 in high range, and it is 1.86:1 in low range. It is a 1959 F250 with the divorced type transfer case.
Kenny

Sep 30, 2000 | 01:52 PM

horsepuller

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From: Southern California

Transfer case reduction ratios

Then my BW xfer case low range is probably around 1.9:1 too. I agree, you really wouldn't need much lower range. I think axle ratio is the only thing that limits the usefulness of low range.
BTW, I used low range to uproot a 15' palm tree. The ground was damp, I hooked my chain near the top of the tree for better leverage, and I put 1,000 pound of sand in the bed for good traction. The hardest part was getting the cut up stumps into the truck. I had to use a come-along and a ramp.

Oct 1, 2000 | 01:24 AM

mrlaserboy

Senior User

Joined: Jan 2000

Posts: 242

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From: St. Paul, MN

Transfer case reduction ratios

Taken off the 4lo.com gear calculator page-

Dana 300
Jeep
Lo Hi
2.62 1.00

Borg Warner 1356
Ford
Lo Hi
2.69 1.00

DANA/Spicer 18
Jeep
Lo Hi
2.46 1.00

DANA/Spicer 20
Jeep, IH (TC-145), GM, Ford
Lo Hi
2.00 1.00

NP 203
Chevy, Ford, Dodge
Lo Hi
2.00 1.00

NP 205
Chevy, Ford, Dodge, IH
Lo Hi
1.98 1.00

NP 207/208
Jeep, Chevy, Ford, Dodge
Lo Hi
2.61 1.00

Dustin Siebert
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