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Old 03-20-2011, 05:10 PM   #1
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1986 34.5' Airstream 345
Tyler , Texas
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Gear Vendors

I would like some input from the forum on the +'s & minus' other than cost of installing gear vendors on a 345. With the gas prices always on a roller coaster I need to either try to improve the gas milage or sell the 345 and purchase a diesel pusher that gets 9 to 12 per gallon and not the 5 that I get now. If anyone has first hand milage improvement please respond so that I can decide what to do next.
Thanks, Pete
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Old 03-20-2011, 05:23 PM   #2
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1991 34' Excella
Princeton , New Jersey
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I installed a Gera Vendors on my 87 Suburban. I was towing a 34 ft Airstream. While the GV was a great improvement in the limitations of the stock transmission I would not say there was any improvement in gas mileage that could ever be realized in the life of the truck.

$2,000+ is a lot to put into that older rig.
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Old 03-20-2011, 05:25 PM   #3
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1961 24' Tradewind
1969 29' Ambassador
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I installed a gear Vendors on my Dodge pickup. While the reduction in RPM was nice it will never pay for itself with fuel savings.
I went through 5 units in 400,000 miles. The best lasted about 200K, the worst about 2000
miles. It requires frequent oil changes with synthetic expensive oil, Will eventually be damaged if you use gearing to decelerate.
The factory back up was excellent and even the company president is both accessible and knowledgeable.

I took it off at 400,000 miles
Frankly I regret having purchased the unit and would not buy one again.
admittedly I put on a lot more miles than most but when they were impressed I got 200k out of one it sent up warning bells

Several years have passed so perhaps they are doing better now.

Mileage improvement with an overdrive transmission was not more than 5 % or so.
On a transmission with out overdrive there would be more improvement.
I drive a diesel so my fuel economy wqas pretty decent to begin with
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Old 03-20-2011, 05:30 PM   #4
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Quote:
Originally Posted by pjude View Post
I would like some input from the forum on the +'s & minus' other than cost of installing gear vendors on a 345. With the gas prices always on a roller coaster I need to either try to improve the gas milage or sell the 345 and purchase a diesel pusher that gets 9 to 12 per gallon and not the 5 that I get now. If anyone has first hand milage improvement please respond so that I can decide what to do next.
Thanks, Pete

This thread might help.

http://www.airforums.com/forums/f159...tml#post933877
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Old 03-21-2011, 12:32 AM   #5
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1982 28' Airstream 280
Port Angeles , Washington
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I put a GV on my 280 with the Isuzu diesel. I can't compare the power of the 454 in your coach but my 280 is not a ball of fire by any stretch of the imagination. The 4:56 rear axle behind the turbo hydro 400 put 60 mph at about 2900 rpm. The Isuzu is governed at 3200 rpm while max torque is 1875 rpm. This set up didn't make for a comfortable ride or good road speed. The GV brought the rpm down closer to where it should be in the power range, really quieted down engine noise and made the coach much more pleasant to drive. It also gave me six versus three speeds which really helps in the hills. I didn't gain much in fuel economy because I tend to be driving much faster now. It's so nice without the engine roar, it just kind of creeps up on me.

The bottom line is it improved the coach so much I would probably do it again even if it cost me mileage.

Cheers, Dan
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