Pimpinpete

So I've got a 2000 Silverado z71 5.3/4l60e headers, stage 3 transgo, Vette servos, caltracs, and a dynotune. Truck runs good but is dead between 40-50 and quite sluggish off the line. Wanting a ratio that will give me that better takeoff and provide a smoother transition between shifts rather than falling on its face. I daily drive the truck so I don't want it to scream down the highway, but I don't want to go from a 3.73 to 4.10 and be dissatisfied. Also doing the Detroit trutrac along with the gear swap. Future plans may include a healthy cam and POSSIBLY a maggy later on. I've heard a 4.56 is too much for these trucks, and I've heard the 4.10 is not enough. So please give me your thoughts, opinions and experiences any advice is appreciated! Also running 32" tire.

Ksnell

I have 4.56s with 33s. I went from 3.42s. At 75-80 she's a screamer 2500+ rpms at 60 it runs close to 2000. I use my truck to pull mowing trailer around all summer and have heavy bumpers front and rear. It's quite fun to drive now. Before it did the job ok but now it feels like 2x the truck. One more gear would make it the perfect ride but I'd go back with 456s tomrrow for how I use the truck.
I don't know how to post a video but if u wanted to pm your cell i could give u a video of a 0-70 ish run in a 45mph zone so shut it down quick and get some more videos later at crusing

Pimpinpete

Yeah that doesn't sound bad but it would be insanely loud running like that for me. Swicune11@aol.com is my email you can send it too. 4.56 just seems pretty high to me lol. I'd also be running a little higher rpm because I'm on 32s.

FFDP

iTrader: (2)

Install a cam if you want some of your low end back that you lost with the headers.

I'd go to 4.10's personally.

arthursc2

iTrader: (5)

I have 4.10 on 33s.

If if I regear, it will be to 4.56, but tbh I am happy with 4.10

thewrx

For a 4 speed all id go would be a 4.10 for dd, no way 4.56 or higher unless i was running 35s on a jeep or something.

if you alredy have 3.73 wouldnt bother, gear swap labor not the cheapest especially 4x4. Spend money converter or boost.

Ksnell

Think I paid 1500 cash to do mine front and rear with new carrier/locker 25k on em so far no problems, mileage may have went down maybe .5 around 12-13 after intstall, but since the new headers and 3" it has went back up higher than ever 15-16

Velocity1

iTrader: (3)

Overall height or diameter of the tire you're running has a lot to do with how the trans/converter behave and also weigh into converter and gear selection.

I've got a 2000 Silvy Z71 ex-cab 4x4 with 34" tall tires, 4L65E built to the nines, Trans Go HD2, Circle D 3200/278mm, (recommended by Chris), with a healthy 5.3l tuned by Justin at Black Bear and 4.56's and wouldn't change a thing!

With the Tru-Cool 40k gvw cooler with 180* thermo, my trans never sees over 165-170 degrees as measured by Autometer 2 5/8" mechanical trans temp gauge. I also added a Dearle +2 qt flow thru fluid cooler pan.

A good tune is ultimately important.

3wide

It sounds like your 40-50 drop is from the 1-2 shift in the 4L60E, I would go with 4:10's with a stall converter. With the power you want to add maybe factor in a 4L80E instead which will have a better 1-2 shift ratio plus the stall converter to launch and keep in you in the power band between shifts.

Pimpinpete

So I guess the main question I have is if it's worth the $2k to switch to 4.10s? Should I go with a taller gear than that? Or just wait on cam and convertor to put me where I want to be? (Gears, cam and convertor would be alot more fun though )