O.K. people I need opinions on what will be the best gear ratio for my Sierra. I do a lot of driving on the freeway, and it's a DD. Pleas keep that in mind. I am also down the road going to swap in a 6.0 lq9 engine.
I am thinking 3.90 or 4.10
3.90
4.10
O.K. people I need opinions on what will be the best gear ratio for my Sierra. I do a lot of driving on the freeway, and it's a DD. Pleas keep that in mind. I am also down the road going to swap in a 6.0 lq9 engine.
I am thinking 3.90 or 4.10
1999 GMC Sierra SLE sc sb 4.8l 4L60E, Comp 1.75 roller rockers, graniaelli maf, garneaelli wires, Aem brute force intake, BBK 80mm tb, Nelson tune, 2/4 drop, Denali rims, custom grill, Denalli guages, Edelbrock IAS shocks, Tahoe E-fans, Nelson harness, and tune, McGaughy's 2" drop spindles, New matched coil springs, Air Lift rear lowerd air bag kit, Air Lift wireless remote
List of things to do
4.10 gears and a new posi, Lt headers, Cam, Heads, Intake,
Not much difference in driveability...probably wouldn't notice the difference therefore go for the 4.10's.
Bigger is better in Texas, except the women, California just follows what Texas does. I say 4.10
2007 Chevy Silverado Classic 4.3L V6
Magnaflow Muffler, CFM Technologies CNC Machined High Flow Vortec Throttle Blades, STS Rear Turbo, Intercooler, Accell Distributor and Coil, 8mm wire, Autolite Platinum plugs, Runs out of fuel at 4000RPM. Marine intake with larger injectors soon. Hoping to squeeze 10psi.
What size tires you going to run?
Gone, but not forgotten!
I have 275/60/17 tires which are 30" tall.
1999 GMC Sierra SLE sc sb 4.8l 4L60E, Comp 1.75 roller rockers, graniaelli maf, garneaelli wires, Aem brute force intake, BBK 80mm tb, Nelson tune, 2/4 drop, Denali rims, custom grill, Denalli guages, Edelbrock IAS shocks, Tahoe E-fans, Nelson harness, and tune, McGaughy's 2" drop spindles, New matched coil springs, Air Lift rear lowerd air bag kit, Air Lift wireless remote
List of things to do
4.10 gears and a new posi, Lt headers, Cam, Heads, Intake,
that's the same tire i have on my 4.10'd 4.8, i get about 20-22 on the highway cruising at 75 mph. i want to say i'm turning a hair under 2500rpm at 75 mph. they helped out a lot in town too, don't have to floor it to get off the line. only downfall is my top speed is 138Originally Posted by 99LS1
4.10
Go big or go home.
2001 ECSB 4x4, 5.3, Radix, 3.0 pulley, VHP Trucker cam, 216/224 .551/.551 115 lsa, 1.8 Crane roller rockers, 4L65E, Yank SC3000, 3.73, Cal-Tracs, HPTuners.
switching from a 3.73 to 3.90 is almost pointless because that's such a marginal difference. go ahead with the 4.10, especially if you're going with a 6.0 later - i hear they ain't all that in the low rpms (especially if you build it)
Well it's looking like 4.10 is kicking butt! I was going to go 3.73 that's on my list of things to do, but my truck is a gu6 3.42 as of now in stock form...
1999 GMC Sierra SLE sc sb 4.8l 4L60E, Comp 1.75 roller rockers, graniaelli maf, garneaelli wires, Aem brute force intake, BBK 80mm tb, Nelson tune, 2/4 drop, Denali rims, custom grill, Denalli guages, Edelbrock IAS shocks, Tahoe E-fans, Nelson harness, and tune, McGaughy's 2" drop spindles, New matched coil springs, Air Lift rear lowerd air bag kit, Air Lift wireless remote
List of things to do
4.10 gears and a new posi, Lt headers, Cam, Heads, Intake,
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