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Old 12-10-2017, 06:55 PM   #1
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Change gears?

Buying a Glacier Peak F30RLS and already "own" a '16 Ram 2500HD 6.4Hemi with 3.73 gears. Dealer is saying to get the gears changed to 4.10 (yeah that's easy).
Anybody got any thoughts before we make the 3000 mile purchase of the 5er? Changeout would probably cost an easy $2k plus we need to add air bags to the suspension...
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Old 12-10-2017, 08:44 PM   #2
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Quote:
Originally Posted by YoungSteven View Post
Buying a Glacier Peak F30RLS and already "own" a '16 Ram 2500HD 6.4Hemi with 3.73 gears. Dealer is saying to get the gears changed to 4.10 (yeah that's easy).
Anybody got any thoughts before we make the 3000 mile purchase of the 5er? Changeout would probably cost an easy $2k plus we need to add air bags to the suspension...
Welcome to the forum. Still cheaper than a new truck. As long as the weight of the trailer is within the capability's of the truck.
Bill
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Old 12-11-2017, 10:22 AM   #3
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Hi ! Welcome to IRV2! We're sure glad you joined the gang!

Can't help with the question but wanted to say hello! Keep her between the ditches!

Good luck, happy trails, and God bless!
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Old 12-11-2017, 11:05 AM   #4
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I would try it with the 3.73 gears first . You will have to downshift earlier than with the 4.10's . You may also have to keep the transmission out of overdrive as well. With the 4.10's your empty fuel economy will not be very good. Now if your truck came with 3.08's a gear change would have to be done.
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Old 12-11-2017, 11:23 AM   #5
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Wed like to thank everyone for the input. We are going to try as is except well add to the rear suspension
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Old 12-11-2017, 11:49 AM   #6
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I would try it with the 3.73 gears first . You will have to downshift earlier than with the 4.10's . You may also have to keep the transmission out of overdrive as well. With the 4.10's your empty fuel economy will not be very good. Now if your truck came with 3.08's a gear change would have to be done.
X 2.

Those would be my thoughts also. The beauty is that when you are not towing there will be top end gears that will provide better fuel mileage and less wear on the engine because it will be turning fewer rpm. It may even be better than the 4.10s in that respect while towing.

Ask the dealer for his specific reasons for the recommendation. Many of them don't have a clue other than it seems like what others do. There are ways to determine fairly accurately using formulas how the vehicle will preform with the current gears as compared with 4.10s. You can do this yourself, or ask the dealer for his calculations, if he has any.

I did a lot of calculations for the diesel conversion I did back in the very early '80s, and they predicted almost exactly how the vehicle actually preformed.

"The proof is really in the pudding" though, as soppy suggests.

Best of luck.

Steve
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Old 12-12-2017, 11:45 AM   #7
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I think the gear change is a wise suggestion. With a gas engine, your transmission will be shifting much more. But more importantly, that's a large, heavy trailer. Can your truck handle that kind of a setup and still be legal? "Dry Hitch Weight (approx. Lbs.) 2455" A couple of people and gear and that number could easily climb to over 3000 lbs. You may want to consider this. I would start by researching your truck's actual capacities.

Whatever you do, have fun and be safe.
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Old 12-12-2017, 11:48 AM   #8
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Yep, try it first and see how it goes. No use spending the money if it's not needed.
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Old 12-13-2017, 10:31 AM   #9
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Knowledge is power. This may help you in your adventure.
http://fifthwheelst.com/documents/ra...ing_charts.pdf

Edited to add, a gear change won't change the legal wt ratings your truck came with. It will however, make it tow better. It is my opinion that if you buy that trailer, you will be upgrading to a more capable truck.
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Old 12-14-2017, 09:46 AM   #10
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Yep, try it as is. If not what you want, and you want to spend some coin (And who doesn't for our toys!!!), the go and:

-Rear end change, not that big go a mechanical deal
-If non 4X4, look into the Gear Vendor. This could get you back to a better MPG while not loaded. And heck, it also provides more options while towing.

Best of luck to you,
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Old 12-14-2017, 09:55 AM   #11
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Dont waste your money on 4.10 gears. Go with 4.56 or 4.88 for best results.
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Old 12-14-2017, 10:06 AM   #12
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Quote:
Originally Posted by Smitty77 View Post
Yep, try it as is. If not what you want, and you want to spend some coin (And who doesn't for our toys!!!), the go and:

-Rear end change, not that big go a mechanical deal
-If non 4X4, look into the Gear Vendor. This could get you back to a better MPG while not loaded. And heck, it also provides more options while towing.

Best of luck to you,
Smitty
We put a Gear Venders umit in our 1988 Type B mh. Still never got over 10 mpg though!
1988 Okanagon 17' unit with 460 and towing package. Did lower the cruise rpm though since it had 4.56 gears.
The OP would need the underdrive unit rather than the overdrive we had.
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Old 12-14-2017, 12:27 PM   #13
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Just my opinion, but if you are on the fence about 3.73 or 4.10, why would you even consider anything lower (numerically higher)? It would be a stump puller, but I'm thinking it would be a killer to your top speed/mpg. I can only say that I wouldn't.

Steve
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Old 12-15-2017, 09:00 AM   #14
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With a dry weight of 15K I agree, run with the gears you have, then make a decision. I would not consider a Hitch weight of 3K as being overloaded on a 2500 series with the supplemental suspension you are adding.
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