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Old 09-21-2018, 04:27 PM   #1
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Teton pass 10% Grade:Safe?

Just recognized Teton Pass has 10% grades. Pulling a 23' TT. I have never seen a 10% grade. Leaving on Tuesday. Comments, suggestions.? Safety is always my number 1 concern. Thanks.
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Old 09-21-2018, 04:52 PM   #2
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With what?
If you have adequate power and food brakes and know how to downshift in order not to overheat your brakes and don’t ever ride them you should be fine.
And that includes making sure your trailer brakes are in good shape and of course you have a brake controller
Even here in the East we have 12 and 14 percent grades
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Old 09-21-2018, 04:55 PM   #3
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No personal experience with that road. We only see 10% once a year heading into a favorite campground and it's only 1/4 mile long but with a hairpin turn at the same time.
And we are only moving at about 10 mph in both directions.

This discussion may be of some help;

10% grade on Teton Pass: Thoughts? - iRV2 Forums
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Old 09-21-2018, 05:04 PM   #4
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Gear up = Gear down - Short firm brake if you have to gear down.
My preference has always been manually control the gears. Old school.
When going down hill and the speed increases to fast you have to gear down to the next gear. The engine has to hold your combination. Using to much breaking will increase heat on drums and pads.

Do not rush yourself even if others pass you.
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Old 09-21-2018, 05:23 PM   #5
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10% never been at that grade how long are the hills.Engine brake real slow should be no problem!Up hill just gonna take awhile! Thanks
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Old 09-21-2018, 05:30 PM   #6
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a total aside. Our first steep grade we were presented with after getting our first TT was a 14 percent over two miles on gravel going to the campground.. I was a little worried about getting out as the gravel was real loose.

Did not stick.. Did not even spit gravel everywhere. So when we encountered 12 percent coming out of Oak Creek in the Sedona AZ area it was a piece of cake.
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Old 09-21-2018, 05:31 PM   #7
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Pass

I live in Jackson and drive the pass often. I’d make sure my brakes were in good shape but other than that youll be fine. Lots of trailers all summer. You can take an alternate route. Where are you coming from?
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Old 09-21-2018, 07:03 PM   #8
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Thanks, we are in Grand Teton National Park.
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Old 09-22-2018, 05:21 AM   #9
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Ok. Where are you heading to?
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Old 09-22-2018, 09:17 AM   #10
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When going to and from Grand Teton I skip the pass and go through Alpine WY to Idaho Falls WY. You could do the pass but there are alternatives, so why do it?
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Old 09-22-2018, 08:18 PM   #11
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The old rule of thumb I learned was to desend the hill in the same gear you used to go up. Works for me most of the time.

One thing to watch is transmission temp.
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Old 09-22-2018, 08:50 PM   #12
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We have taken it Westbound a couple of times... You will climb this pass at no better than 35.. This pass does not allow any vehicles over 60k gross and there is a good reason for it... it is steep and has good pavement with a few sharp turns. The downhill side is just as steep with a long straight at the end... Engine/exhaust brake is highly recommended...

If you have never run a long 10% grade before, you should try a short one first to know what you are in for. After taking this pass in our FJ a few weeks ago, we elected NOT to take it in our Seneca when we left Jackson (33,000#). Our FJC is a 6-speed manual and I had trouble keeping our downhill speed in check in second gear.

Read the link that 2008Seneca posted on the other forum... first hand experience too.
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Old 09-25-2018, 08:11 PM   #13
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Thanks to all of you...this will end of post: We left this morning. Since we were not in a hurry we decided to head back through Yellowstone, have lunch, and then continue. That actually was the deciding factor. Hit a number of 6% grades with no problems but DW mentioned that she was glad we decided not to do a 10% grade. Her comment was why chance it if we don't have to? Wise DW.
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Old 09-25-2018, 08:16 PM   #14
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Use the jake brake
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Old 09-25-2018, 09:48 PM   #15
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Thanks, but not on a 2013 Chevy Van .
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Old 09-26-2018, 07:30 PM   #16
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For the future... Just start slow 20 30 mph on the downhill side, before you crest take your foot off the gas and use the hill to slow you down... epic big hills even have stopping areas. Keep speed in check with selecting lower gears.

It's good your asking questions. Take this info and you will be good
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Old 09-26-2018, 08:25 PM   #17
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That's what I did on my recently completed 2 month tour of the upper Rockies, and the Black Hills. My 3.5L Ecoboost doesn't provide a lot of natural engine braking, so I got very familiar with 2nd gear in my 6 sp auto transmission.

Quote:
Originally Posted by imjustdave View Post
For the future... Just start slow 20 30 mph on the downhill side, before you crest take your foot off the gas and use the hill to slow you down... epic big hills even have stopping areas. Keep speed in check with selecting lower gears.

It's good your asking questions. Take this info and you will be good
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Old 09-29-2018, 12:02 PM   #18
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We've pulled our fiver up and over several times. No problem. I put the auto transmission into manual and use engine braking. Hardly need to touch the brakes.
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Old 09-29-2018, 01:28 PM   #19
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Don’t crest the hill going too fast. In fact, crest at whatever speed you want to descend (slow, like maybe 30mph). If you have a tow haul mode on your transmission, use it. I pulled a 42 ft fifth wheel over Teton pass into Idaho a couple of months ago. You’ll be fine. Enjoy.
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Old 09-29-2018, 01:40 PM   #20
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I’ve done it three times. Twice pulling a 39’ fifth wheel with a RAM w/ Cummins Diesel. Not bad at all with diesel because the exhaust brakes + downshifting kept my speed down with very little braking. The first time I did it I had a gasoline engine truck pulling a 30’ TT. Scared the crap out of me. Gas engines have no exhaust brake - you just have to downshift and use your brakes.
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