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04-11-2015, 05:57 PM
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#1
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Junior Member
Join Date: Apr 2015
Posts: 8
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Gear Vendor Overdrive
I have a '91 460 with a C-6 and 5.14 gears and to go 65 mph I am running at about 3500 rpm and it feels like it is running fine, when I go to 55 mph I am at about 3000 rpm and the motorhome feels sluggish. When I was younger I raced small block Fords so 5-8K was common, my brother ran a big block and said that big blocks don't like high rpm's. So my question is, were these designed to run at the higher rpm or should I get an overdrive to reduce the rpm and what about the sluggishness? Thanks for the Info
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04-11-2015, 07:01 PM
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#2
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Senior Member
Join Date: Jul 2014
Posts: 35,417
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Gee, it did fine since 1991, why mess with it now.
My old Ford 428 CJ was happy, up to 5000 RPM.
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04-11-2015, 09:57 PM
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#3
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Senior Member
Join Date: Dec 2009
Location: Out there, somewhere
Posts: 9,941
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Quote:
Originally Posted by azonsite
I have a '91 460 with a C-6 and 5.14 gears and to go 65 mph I am running at about 3500 rpm and it feels like it is running fine, when I go to 55 mph I am at about 3000 rpm and the motorhome feels sluggish. When I was younger I raced small block Fords so 5-8K was common, my brother ran a big block and said that big blocks don't like high rpm's. So my question is, were these designed to run at the higher rpm or should I get an overdrive to reduce the rpm and what about the sluggishness? Thanks for the Info
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azonsite,
Well Sir, the 460 is a great engine. It was the competition for the GM 454 for years and many, many folks, including me, had great luck with those engines. While they are a big block and can run at high RPMs for short distances, grades etc., they're not as "at home" at is as they're younger brother, the V-10. The V-10 can run at as much as 4500 all day long as I'm told.
As for Gear Vendors, they were real close to us where we used to live in the eastern San Diego area and, there was always a motor home on one or both of their outside lifts, just about every time we drove by on highway 67. I've not personally had any real experience with them and or, any of their units but, lots of folks that I've spoken with, were pretty happy with the end result. Good luck.
Scott
__________________
2004 ITASCA HORIZON 36GD, 2011 GMC Sierra 1500 4x4 Toad '20 Honda NC750X DCT
2018 Goldwing Tour DCT Airbag
Retired-29.5 yrs, SDFD, Ham - KI6OND
Me, Karla and the Heidi character, (mini Schnauzer)!
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04-11-2015, 10:11 PM
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#4
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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We put one in a '88 Okanagan 17' Type B MH. It had the 460 and at least 4.10's in the rear as it had the TT towing package and 16" tires. Never got over 10 mpg but it did cruise quieter but it only weighed 8,800#'s too. I think it's be a waste of money in that old a rig.
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2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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04-11-2015, 10:20 PM
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#5
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,442
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Welcome to iRV2.
JMHO . if it feels sluggish at 3000 rpm then dropping the RPM will just make that feeling worse , even a 15% overdrive would drop the RPM by 450 RPM and you would find constant downshifting of the trans to maintain speed. Longer time in a lower gear = more fuel consumed.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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04-12-2015, 08:25 AM
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#6
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Member
Join Date: Jan 2014
Location: Milwaukee area/central Idaho
Posts: 93
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Used after market overdrives when I had gasser mh's. Didn't help mileage but kept engine speed down, less heat and easier on accessories, AC compressor/alternator/water pump.
On the other hand engines in that era were cammed to run @ 3/3500 rpm.
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04-13-2015, 04:28 PM
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#7
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Senior Member
Join Date: Dec 2014
Posts: 3,281
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Quote:
Originally Posted by azonsite
I have a '91 460 with a C-6 and 5.14 gears and to go 65 mph I am running at about 3500 rpm and it feels like it is running fine, when I go to 55 mph I am at about 3000 rpm and the motorhome feels sluggish. When I was younger I raced small block Fords so 5-8K was common, my brother ran a big block and said that big blocks don't like high rpm's. So my question is, were these designed to run at the higher rpm or should I get an overdrive to reduce the rpm and what about the sluggishness? Thanks for the Info
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gear vender is a great add... about 4500 installed.... what it does is over drive the tailshaft. so you have 1gear and 1st gear over drive if you have a
3 speed , you now have a 6 speed they split to 500 rmps so if you can't pull 3rd up a hill and 2nd over revs, you can go to 2nd over.
my last one I've done was 2012 winnabago v-10
be sure to go to the wagon wheel saloon while you wait
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04-13-2015, 09:41 PM
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#8
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Senior Member
Monaco Owners Club
Join Date: Mar 2014
Posts: 185
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Mine came from the factory with a Gear Vendors overdrive. Doubt I could drive over 55mph without it.
__________________
1988 34' Executive Industries - Executive Prestige
5.9 Cummins, Allison AT542
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04-13-2015, 09:52 PM
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#9
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Senior Member
Join Date: Jun 2004
Posts: 1,361
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Quote:
Originally Posted by LVRVLUVR
gear vender is a great add... about 4500 installed.... what it does is over drive the tailshaft. so you have 1gear and 1st gear over drive if you have a
3 speed , you now have a 6 speed they split to 500 rmps so if you can't pull 3rd up a hill and 2nd over revs, you can go to 2nd over.
my last one I've done was 2012 winnabago v-10
be sure to go to the wagon wheel saloon while you wait
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The Wagon Wheel is long gone!
__________________
2014 Southwind 32VS
2013 Nissan Xterra PRO-4X
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04-13-2015, 09:55 PM
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#10
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Senior Member
Join Date: Dec 2014
Posts: 3,281
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Quote:
Originally Posted by PbdBlue
The Wagon Wheel is long gone!
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that sucks....
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