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09-11-2015, 04:25 PM
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#1 |
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Registered User
Join Date: Sep 2008
Location: Amarillo, TX
Posts: 140
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What diff size to go with 6.0 4l80E?
Trying to determine what diff gears to put in. Now I have the old original 3.08 but I will be going to limited slip and not sure whether 3.73 or 4.10 would be better. At this time I have about a 28.5" tall tire but looking to go a little bigger to about a 31" tire in the future. Any opinions or what is every one else doing with this combo.
Thanks! |
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09-11-2015, 07:42 PM
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#2 |
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Registered User
Join Date: Apr 2015
Location: Abilene, TX
Posts: 136
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Re: What diff size to go with 6.0 4l80E?
I guess it depends on what you will be doing with your truck. You may want to give a little more info so that you receive a better answer.
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======================================== Dennis 37 ford coupe 68 short narrow 72 short wide |
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09-11-2015, 07:44 PM
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#3 |
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meowMEOWmeowMEOW
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
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Re: What diff size to go with 6.0 4l80E?
Those are both the "fan favorite" diff ratio's on these swaps. I like the road manners that the 3:73 offers up, since you can run ~70 at just over 2k (each truck is a little different of course).
The 4.10 is a little more popular for the M6 guys, but you can still totally run it if your truck spends more time at the track or isn't doing long stretches of 70+ highway. I'll tell you what though....with the overdrive trans, either option feels WORLDS better than the old 3spds.
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING  |
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09-11-2015, 08:28 PM
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#4 |
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Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,402
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Re: What diff size to go with 6.0 4l80E?
I dropped a 3.73 in my 02 Silverado, awesome combo....it let that little 4.8 run! My longhorn is a tick different animal....stick shift, 6 spd ROD behind the 5.3. On a 29" tire, 3.42 gears....I have all the gear that I need! She will cruise @ 105 mph, @ 3100-3150 on the tach
 Once again, it depends on you useage....longhorn
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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09-12-2015, 02:56 AM
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#5 | |
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meowMEOWmeowMEOW
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
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Re: What diff size to go with 6.0 4l80E?
Quote:
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING |
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09-12-2015, 07:59 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: What diff size to go with 6.0 4l80E?
Well my 4:10 gears and 4L80E run at 2600RPM's at 80MPH! My truck runs the interstates all the time ever since I bught it back in 1986. I just did a round trip to my dad's 280 miles today.
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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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09-12-2015, 08:14 PM
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#7 |
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Senior Member
 
Join Date: Jul 2012
Location: Oblong, Illinois
Posts: 7,028
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Re: What diff size to go with 6.0 4l80E?
My burb has a 6.0 with 4L80E and 3.73 gearing. Very happy with the combination.
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