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Old 08-27-2015, 08:03 AM   #15
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1999 Safari Trek w/454 Vortec P30 chassis

I am thinking what I need is an underdrive unit. I pull a 4500 pound trailer behind our 16,000 lb small class A. I am thinking that it would provide less wear and tear on unit/engine and give better hill climbing. We are fulltimers...return on investment by resale is not in my equation. Better overall performance and less wear and tear on unit is my primary concern.

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Old 09-18-2015, 08:21 AM   #16
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Gear Vendor . I'm not sure how or if one can move a post from one thread to another but under " gear splitters " there are many comments about these units , including my own. Good Luck .

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Old 09-18-2015, 09:18 AM   #17
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Originally Posted by twinboat View Post
You would actually need an underdrive to get more power to the wheels but the transmission does that when it downshifts.

I have an overdrive transmission and it drops down to drive, almost, at the sight of a hill. If it's a steep hill, I am in second gear with my foot to the floor, at 45 MPH.
a 37000# diesel pusher does the same thing when it sees a hill
Raving is a hobby hobbies cost money
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Old 09-21-2015, 09:01 PM   #18
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I would recommend forgetting the gear vendors and installing headers and straight through mufflers, such as Magnaflows. Tri-Y headers will make the engine run much cooler, and will significantly improve the power, but to gain any advantage, you must run straight through mufflers or you are wasting your money. The Magnaflows are reasonably quiet at normal operating conditions, only only talk to you at full throttle.

My original setup with the 454 had been regeared for towing power. While it made some difference, I think the headers made a much more useful difference. Anytime you add gears, there is loss. That is just physics. While it put the engine in a better RPM range, it is less efficient and you are not increasing horsepower. I would suggest that the concept of gear splitting optimizes gearing for the limited power band of the motor. Installing a good Tri-Y and free flowing exhaust will give you a broader power band and more over all power, so you don't need the gear splitting.

Not to mention, but it will cost a lot less money.
'83 Revcon Prince 31' FWD FMCA F298817
502 w/Howell/GM ECM/Edelbrock MPFI,Thorley's & Magnaflows, 4L85E 4 spd, KoniFSD
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Old 09-21-2015, 09:09 PM   #19
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Originally Posted by halftimer View Post
a 37000# diesel pusher does the same thing when it sees a hill
I guess that depends on the hill and engine, ours weighs 50,000#'s and hardly notices a hill.
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft
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RV'ing since 1957, NRA Benefactor Life, towing '05 Odyssey
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Old 09-23-2015, 10:06 AM   #20
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Posts: 43
I own a 1991 Holiday Rambler Alumi-lite on the Ford E chassis with the 460 and the C6 three speed trans.
I have the Gear Vendor over/under aux. trans. I am very happy with the GV unit. This units does both overdrive and underdrive (gear splitting) and I use it all the time.
Sure is nice to have that overdrive, makes the engine very happy, as for milage, I do not keep track, but just know it gets better milage. When going up a hill I either turn the GV unit off giving me just the 3 gear of the transmission or I have gotten pretty good at shifting into 2nd and turning on the GV at the same time giving 2.5 gear ratio. I then beat most new RVs and all commercial trucks up the hill. Operating the GV system is easy, a floor button and control panel which either puts it into auto (the unit kicks into or out of overdrive at around 35 MPH) or into manual.
Is it worth the cost - for long term ownership yes. I have owned my for over 15 years and in fact had the same unit in my E150 van pulling a trailer.

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