I'm HIGHLY considering regearing this Z I have here to 4.56:1 gears with the 33" tires. That'd give me about 2300-2400rpm @ 70mph. Do you guys think that is too high for a cruise RPM?
Now I'm at a poor 1800rpm with my 3.73:1 gears. My truck drags on the freeway and around town.
What does everyone think? I found someone locally that will help me install the gears (front, rear, and Eaton for about $150/axle!too.
Thanks!
The superior man is modest in his speech, but exceeds in his actions. - Confucius
"He who asks of life nothing but the improvement of his own nature, is less liable than anyone else to miss and waste life."- Henri Frederic Amiel
'01 Chev Z71 LT - '85 BMW 745i TURBO - '88 BMW 750iL - '88 Ford F150 XLT Lariat - '79 MB 240D - '79 MB 280S Euro
'80 MB 380SE-5.0 Euro - '85 MB 300SD - '87 MB 300SDL - 1990 MB 300SEL - '91 MB 300SE - '91 MB 560SEL
Let's face it, the red hair... makes 'em wet.
that will work...i got 373 gear and i criuse at 2250 rpm at 70 and 2450 at 80 so it doesnt hurt your motor.will only hurt you wallet cause you will get down to about 12 mpg at that rpm.
admin please delete this acct....
I have the 3.73s and I cruise all day at that RPM. I even average 19-21 MPG.
2006 Superior Blue Trailblazer SS AWD, Stock as a rock
Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).
Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning
Yeah I see my MPG going up. I never cruise faster than 70mph in the truck...it's a brick. My RPM is too low at cruise.
Currenty I average 15.5-16.5 mpg and just under 20mpg on the freeway cruise at 70mph.
The superior man is modest in his speech, but exceeds in his actions. - Confucius
"He who asks of life nothing but the improvement of his own nature, is less liable than anyone else to miss and waste life."- Henri Frederic Amiel
'01 Chev Z71 LT - '85 BMW 745i TURBO - '88 BMW 750iL - '88 Ford F150 XLT Lariat - '79 MB 240D - '79 MB 280S Euro
'80 MB 380SE-5.0 Euro - '85 MB 300SD - '87 MB 300SDL - 1990 MB 300SEL - '91 MB 300SE - '91 MB 560SEL
Let's face it, the red hair... makes 'em wet.
these 6.0's dont get shit for mileage..best i got was 16.0 and that was on long haul with cruise control on 70.if i cruise 75 to 80 it goes to 13.5mpg quick.Originally posted by GMCwantsLS1@Aug 3 2004, 06:50 AM
I have the 3.73s and I cruise all day at that RPM. I even average 19-21 MPG.
admin please delete this acct....
70 mph is right at 2000
3.42 gears
best I ever got was 19.x - almost 20
that was the cruise right at 65 - when it was brand new
2003 LS 2wd ECSB 5.3 3.42 locking,
D&J Intake, 180F T-stat, Gibson Sport Truck system-replaced muffler w/ Race Truck muffler,
TB Bypass, ASP pulley, B&M 24k SuperCooler, Nelson Tune.
Hotchkis 2"/4" - IAS Rear Shocks
6,700 miles
AIM = Buyer Beware !!
http://members.cardomain.com/csherma1
rule of thumb...it takes more rpm's to get more hp...it takes more gas to get more rpm's....more rpm's you cruise at ..the more gas you gonna burn.
admin please delete this acct....
....unless you are below the torque curve. If you run below the power curve you could actually get worse gas mileage.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
Exactly! It would take the truck more work at 1800rpm @ 70mph than it would at 2200rpm @ 70mph.Originally posted by GREG_92_C1500_2001_LS1_A4@Aug 4 2004, 11:22 PM
....unless you are below the torque curve. If you run below the power curve you could actually get worse gas mileage.
The superior man is modest in his speech, but exceeds in his actions. - Confucius
"He who asks of life nothing but the improvement of his own nature, is less liable than anyone else to miss and waste life."- Henri Frederic Amiel
'01 Chev Z71 LT - '85 BMW 745i TURBO - '88 BMW 750iL - '88 Ford F150 XLT Lariat - '79 MB 240D - '79 MB 280S Euro
'80 MB 380SE-5.0 Euro - '85 MB 300SD - '87 MB 300SDL - 1990 MB 300SEL - '91 MB 300SE - '91 MB 560SEL
Let's face it, the red hair... makes 'em wet.
the 6.0's get the best gas mileage at 60mph, but who can go that slow these days?
2005 Chevrolet Silverado 2500HD ECSB 2WD
365 CID motor built by "Rex", Magnuson TVS 2300,WCCH StageII LQ9 heads, EDC Cam, SW Headers, Magnaflow Exhaust, CPT 4L80E, PI 2800 TC, TRACK: Real Racing 16x12 wheels, M&H DOT Cheater Slicks, STREET: Intro Pentia 8 20x10 wheels, BFG KDW's
2008 Nissan Frontier KC VQ40 V6 AUTO 2WD.....Daily Driver
2002 Honda CBR954RR
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