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Reply With Quote4.56 or 4.88.
spools are not for street use.
gears require experience to install properly or help from someone who has done it before.
richmond, motive gears are good. get a trutrac locker for the rear.
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This is a discussion on 99 Silverado Z71 Lifted on 35's Gear Swap within the Performance forums, part of the General Discussion category; I wanted to do upgrade my gears in my truck. I have 3.73 gears in the truck now i think ...
I wanted to do upgrade my gears in my truck. I have 3.73 gears in the truck now i think and i need a re gearing. i have no more punch rolling on the big rubber. I didn't know if i should go with the 4.10 or 4.56. It is a daily driver and it sees its fair share of mud. I do also drive interstate a little. i just want the best of both worlds. I'm trying to get more MPG out of this guzzler but i also want to go when i want it to go. Are Gears hard to change? should i just go to a shop? what brand should i get? and would it be a bad idea to put a spool in the front so i can have true 4WD?
4.56 or 4.88.
spools are not for street use.
gears require experience to install properly or help from someone who has done it before.
richmond, motive gears are good. get a trutrac locker for the rear.
O2 GMC RCSB 4.8L V8 AUTO 3.73's
rebuilt/beefed up 4L60E(at 43,000miles)
Matching Ninja 500r
What he said, all of it.
No way you could spool your front diff, one, the diff would never survive, and two, with a central axle disconnect in the diff you wouldn't be able to steer, even in 2wd.
4.56's get my vote.
4.56s
98 Chevy RCLB K1500, 5.7, 4L60E transgo shift kit, vette servo, 14 Bolt SF, 3.73s, Blackbear 89 tune
what rpm would the engine be running say around 70-80mph. whats a good locker for the front thats not really expensive?
2300rpm@75mph. If you think higher rpm=bad mpg, it isn't the case. It's all about how hard the engine is being worked.Originally Posted by wpittman
There are no locker options for 8.25IFS, is the housing is aluminum, it dies often enough in an open set-up, lockers or limited slip would be death in seconds.
Do some searching, I don't think you even know how your front diff works at this point.
I know it works i use it all the time. damn so the only way i can get true four wheel drive is a solid axle swap???? if so how much does that run?
4.56 gears. I used premium Yukon gears in my Tahoe and they were really nice. Very quiet and very strong. I also endorse the TrueTrac.
No locker options for the 8.25" IFS and you wouldn't want to try. It would scatter like a handful of marbles. If you're in a place where you really want a front locker, look at doing a solid axle swap.
1999 2 Door Tahoe 4x4 w/ 14 Bolt SF & TruTrac. Corvette servo, Gibson cat-back, custom tune from Black Bear, AD244 alt. upgrade, Z71 skid plates, Escalade cluster, 2" block + 1.5" crank, 285/75R16 SOLD 1/2012
2008 Silverado 1500 Z71, Borla catback, block and coil spacer
I'm sure it does work, what I am saying is if there were an LSD, locker, or spool in there, it would die, dramatically, in multiple pieces.
how much are solid axle swap??? is it hard to do, i have a lot of tools and a bit of mechanical skills
Last edited by wpittman; 04-26-2012 at 08:12 PM.
wheres a good place to buy the gears???
1999 2 Door Tahoe 4x4 w/ 14 Bolt SF & TruTrac. Corvette servo, Gibson cat-back, custom tune from Black Bear, AD244 alt. upgrade, Z71 skid plates, Escalade cluster, 2" block + 1.5" crank, 285/75R16 SOLD 1/2012
2008 Silverado 1500 Z71, Borla catback, block and coil spacer
4.56s or 4.88s, true trac for the rear and dont even think of locking the front.
I have used motive in 4.56s and 5.13s and they where quiet
05 Sierra
Superlift, 3"BL, Shackle Flip, 36"Iroks, 14FF, 5.38s, ARB Air Locker, L33, PatG/EPS 223 226, 610 605, 110+4 Cam,TEA .660 Duals, TBSS Intake,FLT Level 6, Circle D 3200, BB Tune,LC-1, LTs, Magnaflow.
Circle D 4C Multi Disk Coming
Google ron's machine service he has great prices.
4.56 will feel pretty close to 3.73 and stock tires. check out this calculator for more exact info.
http://www.grimmjeeper.com/gears.html
I have a 2000 silverado Z-71, I have a few bolt ons and a custom tune, I blew my rear end a part and was looking to do a gear swap also. I took my truck to twisted off road here where I live. Im running 305-65-17 which is closer to a 33in tire than 32in. I did a 4.10 swap with a detroit tru-track. MPG went up a little. For the most part Im where I need to be gear wise. I drive 550 miles every couple weeks and truck is allways pepy. RPMs went up bout 200-300RPM, They told me 4.10 is a great gear for my driving, For more off road go with a 4.56, Or if I ran 35in tires do a 4.56, twisted said on my truck 4.10 will up my cruzing revs 200RPM and 4.56 would do bout 4to6 hundred more. I opted out on the 4.56 cause I wanted more MPGs but kinda wish I would have done them when im cruzin round town in stop and go traffic. Hope this helps out some
4.88's get my vote. i still want more "punch", and it still kicks in/out of OD quite a bit for my liking.
- i'm new
<-thanks again, xZoomerZx
'96 burb - RC, 4.56's, 35's, detroit, SYE, realift, flow 50's, w4m, 06' 17's, other stuff
'98 silvy - z71, 285's, flow 50's, 2" block, full crank, blackbear
'06 malibu - tint & wheels
bootlife if you dont mind me asking how much did it cost for all of that??
LOL dont ask, The rear axle was a total loss so I had to replace it, I got all name brand parts, seals, bearings, gears, and so on. came close to 2000 after tax. if your just doing gears and a tru-track you should be able to do it parts and labor for around 1000. Also I was told the eaton tru-track has had some problems, not sure what tho. so thats why I did the Detroit. But im pretty sure there made by the same people. They just told me to stay away from the eaton.
Mine only kicks out when I go up the 7% grade hill in west tx. Wonder if it has something to do with you altitude? I had some troubles when I had the trinity programmer, and I got around 2500 feet, But I bumped up the spark advance an took care of it.
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