What gear ratio do you guys reccomend? I am doing a 5.3 with a 4L60E transmission into a 1984 short stepside. I am wanting to get good gas mileage as this is going to be a daily driver. It currently has a 2.55 gear ratio I think it might be to high what do you think? Thanks Danny
3.73 or 4.10
If you live in the hills 4.10 on mostly flat land then 3.73.
Might as well toss a Posi in there while you're at it!
626/762 2005 SIERRA 11.34@119.81
My other ride is a '91 Electraglide custom.
I'm currently running 3.42's & at 70mph I'm taching 2100ish rpm. I've got 3.73's awaiting installation. It kinda depends on the person & what you are trying to achieve but I would say you can't go wrong with 3.73's if you've got auto with OD & lockup TC. If it is your only transportation I would be leary of 4.10's.
[1/8 mile E.T. - 8.23 @ 82.86 mph w/1.82 60'] '98swb,4/6drop,20"RozziDeeps on 275/40ToyoProxes '98LS1/4L60E,TRCheaTR cam,Ported TB,Billet MAF ends,MSD8.5 superconductor wires,S&P midlengths,!EGR,!cats,2 1/2" true duals w/X-pipe,Dynomax Ultraflows,TCI 3000,billet servo,TCI deep aluminum pan,3.73's w/Auburn posi; Eclipse CD, Rockford 6 1/2's, Memphis 12's, Punch 200 ix, Punch 500x
The tire size your going to run will have a lot to do with that. What size are you going with? Mine is a daily driver with 4.56's but I have 33" tires.
2011 Silverado LT 5.3 bone stock(for now)
(gone but not forgotten)02 Avalanche Z-71 Vortech supercharged 3.12 pulley 10psi, SMC meth injection, 33 12.50-17 procomp AT, 17x9 procomp wheels, AVIC-N2 NAV, 4.56 gears, Detroit TrueTrac, 2500 stall converter, transgo HD2 shift kit, Vette servos, 80mm BBK throttle body, Edelbrock shortie headers Cold Fusion wet shot (60hp), and too many more mods to list. 8.86/18th 472rwhp/499rwtq
I've got 3.42s with 29" tires and like the mileage with it when it runs right. 22 mpg was awesome!
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
I like the 4.10's I pulled my 3.42's out and Pyle Differential in Baytown installed the new one's . They said I'd be happier with the 4.10's over the 3.73's with the overdrive tranny and boy were they right. I drive 80 miles round trip 6 to 7 days a week and never had a problem out of them. They dared me to try and tear them up at the track and I haven't so far. They did recommend putting factory gears back in since the Richmond have a tendency to make noise and I did. If I could just talk myself into getting a Gear Vendors unit I would be in heaven on the highway!BTW, opinions are like assholes, we all have one! LOL
97 GMC, 2002 LS6.
1991 GMC Syclone #1428
Oh gawd I am so tempted...
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
I love my 4.10s, I also have a 275/55 20s on my truck though.
Tattoos, Kustoms, Chops, Guns and Pits..........Need I say more? AFTERLIFE KUSTOMS.
Getting ready to put an 82 Chevy 1/2 ton blazer under the knife.
EL JEFE
ROUGHNECK
I would go with the 4.10's.I have 3.90's inmy 97 and love them but on that truck I would have to go with the 4.10's.
Planning on 4.10s in my '86 RCSB. Have the 2.73s, so I know how ya feel with the tall gears.
5.3L '86 Silverado (E/T: 14.37s @ 94mph) - First Time Out!Test-n-Tune (Nov 23, 2008) - 13.65s @ 98mph
Posting Permissions
Reply With Quote
