im going to be doing the rear in my truck soon and im trying to decide between 4.10's or 4.56's
any input from experience
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im going to be doing the rear in my truck soon and im trying to decide between 4.10's or 4.56's
any input from experience
How about a little more info about your truck, tire sizes, mods you've made already, future mods you're planning, and what you intend to use the truck for primarily.
tires are 285-50-20
its the truck in my sig. with a 5.3
already has intake, exhaust, built trans, shift kit, 2800 stall
future mods are cam, headers, maybe some kind of forced induction way down the road
its my daily driver but i want a fast street truck. im not worried about gas mileage.
You dont want 4.56 if your going to do f/i
4.10
anyone running 4.56 in a rcsb?
4.10 gets my vote on this one.
Being of the few guys with a LIFTED truck... other forums I'm on, taller gears are A LOT more common.
If you are going forced induction (not sure why everyone keeps saying FI...i keep thinking fuel injection)...you'll probably want 3.73 or 4.10.
If you are going n/a and aren't worried about fuel mileage 4.56 will help times. HOWEVER. The 8.6 rear (disc) or 8.5 (drum) rear ends are pretty tiny, and once you go to a 4.56, there isn't much meat left to the gear...aka BOOM if you beat on it too bad. Tons of guys with bigger tires go for a 4.56 and most end up swapping rears shortly after.
I wouldn't go any larger then a 4.10 in the 10 bolt you have now. If you want to get a ford 9", or corporate 14 bolt, then by all means 4.56.
4.10s FTW
I had a 05 ccsb 2wd lifted with some 35's. After the lift I went from 3.73-4.56's, and an aburn locker... made a HUGE difference. Shortly after I put some LT's, cai, shift kit and servos. Thing would actually run pretty good on those big tires. But the tranny went out pretty quik with the shift kit. Had it shifting wwwaaayyy too hard, it would leave 2-5ft black lines if it hit 2nd at WOT on any pavement. Even driving it that hard I never had any problems with the rearend. So I think if you beef the rearend up with a good locker then go with the 4.56's unless your serious about not staying n/a. Might be alot of fun on the street but the highway would be a different story. 4.10's-4.56's seems like a big jump to me. I think motive makes some 4.30's, that may be your best bet. Good luck bud
-Chris
Dale ran 4.30's in his truck for a while
how much highway driving do you do?
4.10's
thanks for all of the responses
i dont drive on the highway much but when i do its usually a long trip traveling to motocross tracks
wayfast = how was your truck on the highway with overdrive? like what rpm to cruise at 75?
after what oleshifty said im not sure about 4.56 cause i run my truck hard.
right now it shifts from 1st-2nd at about 50mph and 2nd-3rd at about 90
i didnt know you could get 4.30's maybe thats the way to go
50 for 1-2? It has 1.83 gears in it now or you shift it at 9432 RPM?
Yes, in first-gear-overdrive, duh! :confused:Quote:
Originally Posted by GasGuzzler
mine shifts to second at about 45
it must be because of the tall tires because thats where it shifts when its floored
My truck shifts from 1-2 at 50....
Im going 4.30's soon as i get cammed next week !!!!!!!!!
i wont be getting mine done that soon (my race quad motor needs the money first)Quote:
Originally Posted by Slimsilverado
but can you post some feedback on it when its done
Alrighty then....mine shifts to 2nd at 39-41 somewhere.
wow... i shift to 2nd around 20 @ WOT
then again, have the nv3500 with a 4.02 1st & i'm running 31" tires...
4.10s and 29.99" tires i shift into 2nd around 45MPH. also depends on how high i shift. my rev limited is set at 7000 and sometimes i shift at 6600
4.56s !!!!! installed them about 2 weeks ago in my truck. Our tire size is about the same i have 265/50/20 so what do u want to know 2100 rpm at 60 2400at 70 mph its torquey as hell even though my truck isnt runing 100%
yeah... i was afraid to turn my 4.3 that high. something about the way it started to sound around 5000 was scary, so the highest i ever went afterwards was around 4500Quote:
Originally Posted by 2k5Squirrel
Quote:
Originally Posted by silvyrado4.8
thanks man... thats what i was looking for
do you know what mph it goes from 1-2
If u shift at 6k 38 39mph .i installed them mainly to lower my 1/4 time because of my trap speed is low due to the gears not reving high enough at the end .maybe going to the truck this wedsnday ill let u know what i know .believe me u will love the low end power there like no bogging dead spots in the rpms esp right when the converter locks up i in od hope this helps
chevy power!!!
this is with the 4l60e, 3.06, 1.63, 1, .7
RPM 1st Gear 2nd Gear 3rd Gear 4th Gear
500 3 6 10 14
600 4 7 12 17
700 5 9 14 20
800 5 10 16 23
900 6 11 18 26
1000 6 12 20 28
1100 7 13 22 31
1200 8 15 24 34
1300 8 16 26 37
1400 9 17 28 40
1500 10 18 30 43
1600 10 19 32 45
1700 11 21 34 48
1800 12 22 36 51
1900 12 23 38 54
2000 13 24 40 57
2100 14 26 42 60
2200 14 27 44 62
2300 15 28 46 65
2400 16 29 48 68
2500 16 30 50 71
2600 17 32 52 74
2700 18 33 54 77
2800 18 34 56 79
2900 19 35 58 82
3000 19 37 60 85
3100 20 38 62 88
3200 21 39 64 91
3300 21 40 66 94
3400 22 41 67 96
3500 23 43 69 99
3600 23 44 71 102
3700 24 45 73 105
3800 25 46 75 108
3900 25 48 77 111
4000 26 49 79 113
4100 27 50 81 116
4200 27 51 83 119
4300 28 52 85 122
4400 29 54 87 125
4500 29 55 89 128
4600 30 56 91 130
4700 30 57 93 133
4800 31 58 95 136
4900 32 60 97 139
5000 32 61 99 142
5100 33 62 101 145
5200 34 63 103 147
5300 34 65 105 150
5400 35 66 107 153
5500 36 67 109 156
5600 36 68 111 159
5700 37 69 113 162
5800 38 71 115 164
5900 38 72 117 167
6000 39 73 119 170