First question:
Is it pretty safe to assume an '04 truck w/ a 10-bolt diff has a 8.6" ring gear size?
From what i can tell, GM went from 8.5" to 8.6" rgs sometime between 1999 and 2000.
Does that sound correct?
Second question:
Would an 8.5" rgs posi (G80) from an OE 10-bolt be compatible w/ the 8.6" rgs 10-bolt?
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Starting my research on upgrading my open diff to limited slip...
Base: 2004 Victory Red Silverado 1500 2WD RCLB, LR4, 4L60E, 3.73, HD Suspension, P245/75R16 Tires
Mechanical/Performance: Nelson 93 Octane Tune (See Slamma's CarDomain.Com Page for more details)
From what everyone says and everything I read, the 8.5" gears are compatible with the 8.6" gears and vise versa.
New Truck on it's way: '07 Classic GMC 2500HD DuraMax LBZ
03' Silverado ECSB 4x4 Z71 LQ9, TR230, Patriot LS6, 31lbs, Trailblazer stall, Corvette servo, Corsa Touring,
HP Tuners
SOLD - 99' Silverado ECSB 4x4 5.3, Edelbrock RPM, Nitto Terra Grapplers, Texas-Speed Tuned 02' PCM, LT1 fans
As I recall, 8.625" lol Stuff from the 8.5" swaps over without a problem.
But NONE of us are fans of the G80... it really is a piece of crap. Unlocks around 25mph... doesn't really like to lock around corners. The locking counterweight likes to break taking the entire rear with it.
Used Auburns are a better buy but can't be rebuilt in the truck.I have an Eaton in my F150 and it's a killer LSD. You could pick up an older 30T clutch style LSD from other vehicles...I think Impala SS and the similar cars had real ones but light preload springs (150-200lbs).
The superior man is modest in his speech, but exceeds in his actions. - Confucius
"He who asks of life nothing but the improvement of his own nature, is less liable than anyone else to miss and waste life."- Henri Frederic Amiel
'01 Chev Z71 LT - '85 BMW 745i TURBO - '88 BMW 750iL - '88 Ford F150 XLT Lariat - '79 MB 240D - '79 MB 280S Euro
'80 MB 380SE-5.0 Euro - '85 MB 300SD - '87 MB 300SDL - 1990 MB 300SEL - '91 MB 300SE - '91 MB 560SEL
Let's face it, the red hair... makes 'em wet.
i need a posi too any suggestions???? also i dont think im goin new... im gonna go with the ol' junkyard approach i think so any specs? i think its a 10 8.5
1999 GMC Sierra black reg cab short bed SLE Z71 5.3 <--CARDOMAIN PICS
NELSON 93 hot tune, 02 PCM, VOLANT Ram air intake, MSD wires, ACdelco iridium plugs , Edelbrock ceramic shorty headers, jegs off-road y pipe, Dynamax int pipe, 3" Magnaflow Exhaust with turndown, EGR removal, throttle body bypass, vette servo, long servo pin, performance 4th apply piston, B&M shift kit, SLP 160* thermostat, LS1 Fans, NELSON harness, ported and polished throttle body (did it myself, for free lol)..... _______? cam is next as soon as i stop spending all my money
Most Z71s have them stock, G80s but it's there.Originally posted by metalmulisha777@Sep 16 2005, 02:02 PM
i need a posi too any suggestions???? also i dont think im goin new... im gonna go with the ol' junkyard approach i think so any specs? i think its a 10 8.5
The superior man is modest in his speech, but exceeds in his actions. - Confucius
"He who asks of life nothing but the improvement of his own nature, is less liable than anyone else to miss and waste life."- Henri Frederic Amiel
'01 Chev Z71 LT - '85 BMW 745i TURBO - '88 BMW 750iL - '88 Ford F150 XLT Lariat - '79 MB 240D - '79 MB 280S Euro
'80 MB 380SE-5.0 Euro - '85 MB 300SD - '87 MB 300SDL - 1990 MB 300SEL - '91 MB 300SE - '91 MB 560SEL
Let's face it, the red hair... makes 'em wet.
nah mines def not posi... i wanna get like an eaton or somethin.... also do u suggest 4.10s or u think i should keep my 3.73's and also if i change my rear diff do i hafto change my front???? gear wise?
1999 GMC Sierra black reg cab short bed SLE Z71 5.3 <--CARDOMAIN PICS
NELSON 93 hot tune, 02 PCM, VOLANT Ram air intake, MSD wires, ACdelco iridium plugs , Edelbrock ceramic shorty headers, jegs off-road y pipe, Dynamax int pipe, 3" Magnaflow Exhaust with turndown, EGR removal, throttle body bypass, vette servo, long servo pin, performance 4th apply piston, B&M shift kit, SLP 160* thermostat, LS1 Fans, NELSON harness, ported and polished throttle body (did it myself, for free lol)..... _______? cam is next as soon as i stop spending all my money
I'm wanting to change from my 3.73's to 4.10's. 2002 Silverado, factory posi. Are these 10 bolts?Originally posted by metalmulisha777@Sep 17 2005, 06:02 AM
nah mines def not posi... i wanna get like an eaton or somethin.... also do u suggest 4.10s or u think i should keep my 3.73's and also if i change my rear diff do i hafto change my front???? gear wise?
2002 white Silverado ext cab. Taillights filled, roll pan w/93 Cad lights horizontally placed, tailgate handle inside, Gaylord tonneau, bed slide & bed rug, all trim removed, Escalade door handles, 18" Enkei & Falcons, Speed grill. Grill shell, bumper pad, & valance painted white. Mirrors painted white. Many interior pcs painted black (over beige), black leather seat inserts and sun visors. 2" dropped DJM lower control arm, shackles/hangers for 4" rear drop. Engine: 5.3 , Radix w 2.8" pulley, 90 mm throttle body, Dart 225 heads, Comp Cam 581-588 224-230 on 114. ARP head bolts. KTech rod bolts. Alky Control methanol injection, Pacesetter lt's into elec cutouts then 4" polished Magnaflow SS mufflers then 4" ovalized SS pipes exiting in front of rear wheels both sides, gas tank removed and 24 gal. fuel cell where spare tire was w/Aeromotive pump, pre and post filters and pump controller & -10 SS fuel line. 160 thermostat MSD wires & Perma Cool fan, 34" radiator, Meziere elec water pump. Valve covers, alternator & brackets powdercoated white. Built 4l60e, 4.56 with Detroit Locker Trutrack. 2 Interceptor logging guages, FAST dual 02 sensor wb gauge, Cyberdyne vac/boost gauge. Truck is actually the property of a little Benji type dog. Pics of him and the truck too www.swardphotos.shutterfly.com
In a 4x4 you have to upgrade front and rear diffs. PITA unless you know someone that does them. Z71s should have a 4.10:1 STOCK due to weight issues, if you have the extra cash or are spinning bigger tires... I'd go for it. Consider even a 4.56:1 It's just 100rpm more on a 33" than a 31" on a 4.10:1.
But in a 2x4 I don't think there's enough difference to warrant the cost. I have 4.10:1 gears in my F150 now and I don't think I'd do it again if I had the option. I'd have just gone with the Eaton.
The superior man is modest in his speech, but exceeds in his actions. - Confucius
"He who asks of life nothing but the improvement of his own nature, is less liable than anyone else to miss and waste life."- Henri Frederic Amiel
'01 Chev Z71 LT - '85 BMW 745i TURBO - '88 BMW 750iL - '88 Ford F150 XLT Lariat - '79 MB 240D - '79 MB 280S Euro
'80 MB 380SE-5.0 Euro - '85 MB 300SD - '87 MB 300SDL - 1990 MB 300SEL - '91 MB 300SE - '91 MB 560SEL
Let's face it, the red hair... makes 'em wet.
I've had three Z71's (98,99,03) and they all had 3.73's for gears. Typically I see more 3/4 tons with 4.10 gears.Originally posted by Hit Man X@Sep 17 2005, 01:54 PM
In a 4x4 you have to upgrade front and rear diffs. PITA unless you know someone that does them. Z71s should have a 4.10:1 STOCK due to weight issues, if you have the extra cash or are spinning bigger tires... I'd go for it. Consider even a 4.56:1 It's just 100rpm more on a 33" than a 31" on a 4.10:1.
But in a 2x4 I don't think there's enough difference to warrant the cost. I have 4.10:1 gears in my F150 now and I don't think I'd do it again if I had the option. I'd have just gone with the Eaton.
New Truck on it's way: '07 Classic GMC 2500HD DuraMax LBZ
03' Silverado ECSB 4x4 Z71 LQ9, TR230, Patriot LS6, 31lbs, Trailblazer stall, Corvette servo, Corsa Touring,
HP Tuners
SOLD - 99' Silverado ECSB 4x4 5.3, Edelbrock RPM, Nitto Terra Grapplers, Texas-Speed Tuned 02' PCM, LT1 fans
The G80 is manufactured by Eaton, and I like mine, but I guess I'm not as "hardcore" as some of those around here. Here's Eaton's page:Originally posted by metalmulisha777@Sep 17 2005, 06:02 AM
nah mines def not posi... i wanna get like an eaton or somethin.... also do u suggest 4.10s or u think i should keep my 3.73's and also if i change my rear diff do i hafto change my front???? gear wise?
http://www.traction.eaton.com/prod2.htm
Scroll almost to the bottom and it tells you where to get one
2002 ECSB, Nelson Tune, LS1 electric fans, 145A alternator, K&N FIPK, 160º T-stat, TB coolant bypass, Corvette servo, 4 headlight mod, blue LED gauge cluster
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