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07-26-2017, 05:27 PM
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#1 |
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Registered User
Join Date: Jul 2017
Location: FL Born, UT Living
Posts: 139
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Best gear ratio for lq4 or lq9 w/ 4l65e
What will be the best gear ratio for a 6.0 ls swap with a 4l65e in a 67 c10.
The truck will be use both for city and occasionally highway use. \\\\\\ |
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07-26-2017, 05:53 PM
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#2 |
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Registered User
Join Date: Dec 2007
Location: Riverside, Ca
Posts: 411
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Re: Best gear ratio for lq4 or lq9 w/ 4l65e
I'm by no means an expert but it will depend on specific factors on your vehicle. main thing your missing is your tire size. . This calculator might help you.
http://www.angelfire.com/fl/procrastination/rear.html
__________________
Lifted 2wd 1969 C20/ 5.3LS/4L60E :http://67-72chevytrucks.com/vboard/s...d.php?t=728388 |
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07-26-2017, 06:52 PM
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#3 |
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Registered User
Join Date: Nov 2000
Location: Huntsville Ontario Canada
Posts: 4,051
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Re: Best gear ratio for lq4 or lq9 w/ 4l65e
Tire height plays a huge role in rpm. I have a 27" tire and 3:42 in my suburban It needs more rpm for performance and towing. Cruise on freeway it's great.
Same goes for my work truck it has 32" tire and 3:73. It needs at least a 4:11 to work the way I wish it would. Even a 4:56 wouldn't be out of the question. Play with the rpm calculator and decide what you want most out of the truck. Hwy cruiser or performance hauler. Remember the Denali trucks came with 4:11 and 32" tire and they are quick.
__________________
1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD |
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07-26-2017, 08:06 PM
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#4 |
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Registered User
Join Date: Jul 2017
Location: FL Born, UT Living
Posts: 139
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Re: Best gear ratio for lq4 or lq9 w/ 4l65e
I won't run anything bigger than a 29" tall tire. I don't see myself hauling anything with this truck. It will be bagged and on a PB Extreme drop member
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07-26-2017, 08:17 PM
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#5 |
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Senior Member
 
Join Date: Oct 2009
Location: Godley, TX
Posts: 17,994
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Re: Best gear ratio for lq4 or lq9 w/ 4l65e
3.73
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07-26-2017, 08:40 PM
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#6 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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Re: Best gear ratio for lq4 or lq9 w/ 4l65e
My LQ4 has the 4 l80e behind it along with 4:10 gears. Highway is 16-18 MPG and the stop light to stop light is fun also.
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71  Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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07-26-2017, 08:59 PM
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#7 |
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Registered User
Join Date: Nov 2000
Location: Huntsville Ontario Canada
Posts: 4,051
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Re: Best gear ratio for lq4 or lq9 w/ 4l65e
My truck is bagged too
__________________
1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD |
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07-26-2017, 09:10 PM
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#8 |
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Registered User
Join Date: Dec 2011
Location: winnipeg
Posts: 1,107
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Re: Best gear ratio for lq4 or lq9 w/ 4l65e
72mario,cool setup!
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07-26-2017, 09:21 PM
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#9 | |
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Registered User
Join Date: Jul 2017
Location: FL Born, UT Living
Posts: 139
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Re: Best gear ratio for lq4 or lq9 w/ 4l65e
Quote:
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07-26-2017, 09:22 PM
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#10 | |
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Registered User
Join Date: Jul 2017
Location: FL Born, UT Living
Posts: 139
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Re: Best gear ratio for lq4 or lq9 w/ 4l65e
Quote:
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07-27-2017, 06:29 AM
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#11 | |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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Re: Best gear ratio for lq4 or lq9 w/ 4l65e
Quote:
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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07-28-2017, 07:48 PM
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#12 |
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Registered User
Join Date: Oct 2013
Location: Dresden, Ontario
Posts: 647
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Re: Best gear ratio for lq4 or lq9 w/ 4l65e
What Jocko said.
__________________
1970 Short Wide 5.3 4L60E BlackBear tune 3:73 gears, Boyd's Tank 2.5 / 4 drop 5 lug disc brakes Vintage Air 18x8 Ridlers 255/55 frt. 18x9.5 275/60 rear |
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08-14-2017, 12:36 AM
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#13 | |
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Senior Member
  
Join Date: Nov 2008
Location: Glendora, CA
Posts: 6,351
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Re: Best gear ratio for lq4 or lq9 w/ 4l65e
Quote:
My '55.2 has same LQ4/4l85e combo but 3.73 final rationand 235/55x17 tires so I wonder how it'll do for mpg and mileage as well?
__________________
'55 Big Window Shortbed, Drive-It-&-Work-On-It slid down the "slippery slope" to a Frame-Off Rodstoration! LQ4/4l85e/C4 IFS/Mustang 8.8 rearend w/3.73's Dan's '55 Big Window "Build" - Well, Kinda! |
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08-14-2017, 06:35 AM
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#14 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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Re: Best gear ratio for lq4 or lq9 w/ 4l65e
My trucks info is all right here. When I took it to the tunner and put it on the DYNO machine he said the 4L80E takes a lot of HP to operate. My HP # was @290. All stock except for header's.
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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08-14-2017, 07:08 AM
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#15 | |
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Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,448
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Re: Best gear ratio for lq4 or lq9 w/ 4l65e
Quote:
__________________
"If it ain't broke, fix it 'til it is!" Being stupid ain't illegal.  We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck" |
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08-14-2017, 07:41 AM
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#16 |
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Registered User
Join Date: May 2013
Location: WEST PALM FLORIDA
Posts: 1,174
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Re: Best gear ratio for lq4 or lq9 w/ 4l65e
I have 3.73s in both of mine ,one with overdrive 200-4r , and one without turbo 350 , both work great with 29 inch tires
__________________
68 Long Fleet , ly6 , turbo 350 , 3-5 drop , original paint , front discs 67 Small window , 7 foot bed , tweaked 6.0 LSX 2004R Medium Olive 58 Apache fleet , 235 , offy intake , dual exhaust , 4 on the floor , red/white 69 Long Fleet , Custom , 6.0, 4l60 , AC , Medium Olive |
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08-14-2017, 11:02 AM
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#17 |
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Registered User
Join Date: Oct 2016
Location: Dallas Texas
Posts: 3,329
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Re: Best gear ratio for lq4 or lq9 w/ 4l65e
3.73
__________________
67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold |
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