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Old 09-04-2011, 03:13 PM   #1
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2wd Low?

Hey Guys,

Quick question. Can I use my Quigley 4wd low when the front hubs are NOT engaged? I'm mountain biking at a ski resort in Vermont and the road to campground is so steep the unit almost came to stop with the engine at full throttle. The tranny had to be hot. The climb wasn't that long but still it really stressed me out holding the pedal to floor and watching the speed fall to about 5 mph. Next time I want to put the tranny in low and crawl up. It's dry pavement so I didn't want to lock the hubs.

Thoughts? Ideas?

As usual, thanks.

Jim

Four Winds 21rb with Quigley 4x4 5.4 Triton and Torque Shift Tranny
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Old 09-04-2011, 03:23 PM   #2
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Re: 2wd Low?

I do it all the time with my SMB conversion. Cue SMB'ers telling me I'm screwing it up...

Z
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Old 09-04-2011, 03:32 PM   #3
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Re: 2wd Low?

It can be done, and there are times to do it, but that's a lot of torque only going to two wheels.


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Old 09-04-2011, 03:37 PM   #4
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Re: 2wd Low?

I do it frequently. It is very useful for very slow manuvering, i.e. backing up with a trailer.

For a short distance, it should be ok to do 4wd in a straight line on pavement.

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Old 09-04-2011, 04:07 PM   #5
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Re: 2wd Low?

Thanks guys. With reference to torque, I've only got a 5.4 triton coupled to the same tranny and rear end as the V10s and diesels. So how much torque can I really lay down? Fair argument? I'm going to start giving it a try.

Jim
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Old 09-04-2011, 05:40 PM   #6
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Re: 2wd Low?

Quote:
Originally Posted by capnjim
Thanks guys. With reference to torque, I've only got a 5.4 triton coupled to the same tranny and rear end as the V10s and diesels. So how much torque can I really lay down? Fair argument? I'm going to start giving it a try.

Jim
For a good explanation of torque on your drivetrain components, see the last paragraph of the following page.

http://www.4x4abc.com/4WD101/crawl.html


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Old 09-04-2011, 06:59 PM   #7
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Re: 2wd Low?

The 5.4L only has the 4-speed. So not the same.

I would be looking into re-gearing the differentials as a long term solution.

If you use 2wd low, be very smooth on the throttle so you don't snap a driveline or axle shaft.
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Old 09-04-2011, 07:44 PM   #8
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Re: 2wd Low?

CarringB,

My rig is on a e350 Superduty cutaway with a 5 speed torque shift and dually's. I think it has a Dana 70 rear (not sure). Rigged with 4:10's. It's a mini motorhome not van body remember.

I will take your advice and be smooth on the throttle when using low without the hubs locked.

Jim
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Old 09-04-2011, 11:55 PM   #9
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Re: 2wd Low?

Got it. Didn't notice you had the cutaway.

BTW - the PCM will retard power when the transmission gets too hot. Sounds like you are a candidate for a larger cooler. With the torqueshift, you should not need to re-gear for low-speed performance.

The TruCool Max 40,000 GVW cooler is designed for 1/2" lines like the TorqueShift has, and fits in place of the stock cooler if you trim away the passenger side cooler support.

And yes, you have the Dana 70 rear, which is rated for 8500 pounds on the DRW cutaway.
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Old 09-05-2011, 07:48 AM   #10
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Re: 2wd Low?

So which should I do? 1/4 mile up a very steep dry pavement incline in 2wd low or 4wd low. Both seem to have risk and downside. My unit weighs 11500 lbs and I don't want to snap anything in the Dana 70. Thoughts?

Jim
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