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03-02-2009, 01:21 PM
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#1
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3 Rivet Member
1972 Argosy 26
1973 Argosy 26
Fairmont
, West Virginia
Join Date: Jan 2009
Posts: 249
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I am towing this year with a yukon!
It has 3:73 Gears and a 5.7 350 motor I am having trouble maintain speed on the hills what gears would help get me over the hump with out loosing too much speed and other stuff 4:11 or 4:56?
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03-02-2009, 01:33 PM
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#2
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Aluminut
2004 25' Safari
.
, Illinois
Join Date: Feb 2003
Posts: 10,477
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This is not too uncommon. I have 4.10s and 6.0L and rather than beat up the engine, I opt to loose very slight MPH. I can, if I depress the gas, maintain my MPH. If you can't, maybe your engine is getting tired.
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03-02-2009, 01:40 PM
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#3
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"Cloudsplitter"
2003 25' Classic
Houstatlantavegas
, Malebolgia
Join Date: Jun 2007
Posts: 20,000
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Quote:
Originally Posted by shermantic
It has 3:73 Gears and a 5.7 350 motor I am having trouble maintain speed on the hills what gears would help get me over the hump with out loosing too much speed and other stuff 4:11 or 4:56?
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Trans in 3 or OD?
I would use 3 on all but the--------------terrain.
__________________
I’m done with ‘adulting’…Let’s go find Bigfoot.
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03-02-2009, 02:01 PM
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#4
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Moderator
2015 25' FB Flying Cloud
2012 23' FB Flying Cloud
2005 25' Safari
Santa Rosa Beach
, Florida
Join Date: Jul 2006
Posts: 13,159
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What model year is the Yukon, and which transmission is installed?
Brian
__________________
SuEllyn & Brian McCabe
WBCCI #3628 -- AIR #14872 -- TAC #FL-7
2015 FC 25' FB (Lucy) with ProPride
2020 Silverado 2500 (Vivian)
2023 Rivian R1T (Opal)
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03-02-2009, 02:31 PM
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#5
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Vintage Kin
Fort Worth
, Texas
Join Date: Nov 2006
Posts: 8,014
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If it's any help, we all used to, in the 1960's & '70's, used to lose speed in going up hills since that was only reasonable. Might get a running start at 'em, is all. In the mountains, constant wide-open-throttle was necessary to cross some passes. Note that WOT was maintained for ten, fifteen, twenty minutes. On others, constant 3000-plus rpm was the norm. This was on vehicles that had a better power-to-weight ratio than what you are driving, but with numerically-lower gears (3.23 or 3.21).
The advances in engine construction ensure that todays motors have better internal clearances and parts fit. They don't burn oil -- brand new -- at 500-miles/quart. Keep in mind that these "old" engines also lasted over 150,000-miles, untouched.
With todays sophisticated engine controls, they should last as long or longer. I wouldn't sweat having to work the engine hard; not one bit. They're made to take it, so use 'em. That's what the redline is for!
Maintaining speed is relative. If you can keep to the posted minimums, then you are fine. If you can't, then maybe it is worth changing the rear gear set. I wouldn't. Burning some extra fuel doesn't hurt anything. Maybe change the oil according to the severe service guidelines in the manual is what I'd do.
Going slowly up the hills, engine singing, is part of the fun, IMO. Too bad it ain't the old days where we flipped the air cleaner lid over just to listen to that giant set of secondaries on the QuadraJet!
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03-02-2009, 04:14 PM
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#6
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Rivet Master
1971 21' Globetrotter
Currently Looking...
Currently Looking...
Currently Looking...
Arvada
, Colorado
Join Date: May 2006
Posts: 3,530
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Going over the Colorado passes I am more concerned with maintaining a reasonable RPM verses MPH. That's just part of it, Like turning the heater on to blow off excess heat when it's 95 degrees pulling the east bound lane of I 70 to the Eisenhower Tunnel.
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03-02-2009, 04:34 PM
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#7
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4 Rivet Member
1994 34' Excella
Mount Vernon
, Kentucky
Join Date: Jul 2008
Posts: 261
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Just speaking from experience with Mustangs and 1 truck with 4:56 gears, 4:11's are probably the best compromise. A truck with 4:56 gears in Drive is really going to be singing at 55-60 MPH.
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03-02-2009, 08:14 PM
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#8
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3 Rivet Member
1974 27' Overlander
Puyallup
, Washington
Join Date: Apr 2003
Posts: 124
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I have 3.73s and a 5.7L in a 1993 Blazer and a 74 27' Airstream and it pulls just fine! It does need wide open throttle over the top of Snoqualmie Pass to maintain 55mph (for a couple of minutes).
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03-02-2009, 08:37 PM
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#9
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3 Rivet Member
1972 Argosy 26
1973 Argosy 26
Fairmont
, West Virginia
Join Date: Jan 2009
Posts: 249
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I also have a 96 k1500 pickup with a 5.7 350ci / 4l60e trans with 3:73 Gears and it seems to have plenty of pep
The Yukon is a 95 with over 200K less miles then the 96 it has 5.7 350ci / 4l60e trans with 3:73 and its a real dog! (the 96 is the vortec and 95 is tbi is there that much differnce?)
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03-02-2009, 09:04 PM
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#10
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"Cloudsplitter"
2003 25' Classic
Houstatlantavegas
, Malebolgia
Join Date: Jun 2007
Posts: 20,000
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Quote:
Originally Posted by shermantic
I also have a 96 k1500 pickup with a 5.7 350ci / 4l60e trans with 3:73 Gears and it seems to have plenty of pep
The Yukon is a 95 with over 200K less miles then the 96 it has 5.7 350ci / 4l60e trans with 3:73 and its a real dog! (the 96 is the vortec and 95 is tbi is there that much differnce?)
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Yep...The Vortec was a big improvement. Friends 96 Burb would blow my 95 away before the towing mods.
I liked the TBI's reliability though.
__________________
I’m done with ‘adulting’…Let’s go find Bigfoot.
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