Using your T-case as a sub-tranny
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Senior User
Joined: Apr 2003
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Using your T-case as a sub-tranny
I'm sure some of yall will think I'm crazy, some will find this entertaining and some might find this to be useful info. Well, in the quest to be able to tow more with my '88 F-250 (the 3.55 gears being the only limiting factor) I've figured out how to shift my BW1356 manual shift T-case on the fly. I pull up to a stoplight with about 19K in tow, once I'm stoped I put it in low range (hubs unlocked) run through 1st, 2nd, 3rd in low range, then through a quick double clutching process (hard to explain exaclty) I shift the T-case to 2HI and the tranny to 2nd gear which matches up almost perfectly. No grinding, just shifts smooth as silk. I have almost 200K miles on the truck and have been doing this for quite a while, haven't noticed any ill effects. Just thought some of yall might find that interesting. BTW, I think this can only be done with a manual tranny/manual shift T-case and manual hubs. Anyone else ever tried this?
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Joined: Sep 2004
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From: N. Georgia
That is sort of how you had to double clutch the old dump trucks. Clutch it, shift the two speed rear end, clutch it, shift the transmission. Miss one or the other of the shifts and go back down a gear and start over.
Joe
Joe
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Joined: Sep 2004
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From: N. Georgia
Yea, I believe this would not work real well on my esof auto transmission. I might try it someday when I have time to stop on the side of the road and pick up all the parts that it spits out on the pavement.
Joe
Joe
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Originally Posted by JOE-M
That is sort of how you had to double clutch the old dump trucks. Clutch it, shift the two speed rear end, clutch it, shift the transmission. Miss one or the other of the shifts and go back down a gear and start over.
Joe
Joe
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Joined: Sep 2004
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From: N. Georgia
Originally Posted by BigBlockF-250
...When you put your foot in it in those first 3 gears the whole truck rocks over to the right because its putting so much torque to the driveshaft, lol. Yeah, my u-joints must hate me....
Joe
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Joined: Aug 2004
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From: Yuba City, Ca
i can do this with my C6 Np-205 Combo. People look because it's so loud and not goin to fast. i hit 3800 from 1st low range then, manually shift to 2nd lowrange then at 3800 shift to 3rd which is really only regular 1.5th gear. then i will shift the t-case into N the trans to 2nd to match up and then the t-case into 2HI. it's only efficient when i'm hauling really heavy stuff or i'm in the hills. i got 4.10's so it's really low in 1st low range. like 5-10 mph.
Postmaster
Joined: Dec 2002
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From: USA
I often use the Low range in my BW1356 manual shift manual hub truck for moving the trailers or camper around in the yard. I've never used it out on the highway though. I have 4.56 gears in my truck, so I have plenty of gearing for the weight I pull. I'll keep this in mind though if I need more gearing 
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Posting Guru
Joined: Jul 2003
Posts: 2,454
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From: Adams TN
I do it. Sometimes just for fun.
i have a granny gear and 4.10's so 1st gear is pretty low .
DT
i have a granny gear and 4.10's so 1st gear is pretty low .
DT
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