Jump to content

differential help

Jayson Newland

Recommended Posts

Jayson Newland New Member

Jayson Newland

Posted
Posted

alright so i guess first off ill start with i have a 99 silverado 4wd. the rear differential started making a clunking noise when i let off and the truck slows down, more noticeable at lower speeds. i first tought it was a u joint until i crawled under. the pinion rocks back and forth a little bit. today i hauled a trailer for my buddy and after dropping the trailer on the way home it would clunk real hard after beginning to accelerate. so i guess my question is what is a good replacement differential from the stock gt4 g80 (locking 3.73)? how do i know what size the rear end is as far as like a 8.5 or 10.5 etc.and the spline count and such without taking it apart. it is my daily driver. i figure i may as well ugrade while ive got it apart. i do tow a bit. the truck is lifted 3" on 325/65/18 bfg at if that needs to be known. thanks in advance. jayson

RyanbabZ71 Senior Enthusiast

RyanbabZ71

Posted
Posted

Are you sure its the diff and not the slip yoke? I would try greasing the slip yoke first that is cheap and easy to do.

Jayson Newland New Member

Jayson Newland

Posted
  • Author
Posted

middle of 2014 i lost the driveshaft runnin about 75mph on my way to nashville. had to get a custom driveshaft made for it and i got a new yoke for it as well as new tailshaft seal. figured i might as well have. so it should still be good and dandy.

Jayson Newland New Member

Jayson Newland

Posted
  • Author
Posted
heres the build sheet.

1GCEK19V8XE204417

Vehicle: SIL 1500 EXT CAB STD BOX
Year: 1999
Build Date: 1999-04-08

 

RPO Description
M7 RADIO,AM/FM STEREO,ETR,INCLUDES CLOCK STEREO W/CLK(UM7)
UQ5 SPEAKER SYSTEM,4,DUAL FRONT DOOR MOUNTED,DUAL EXTENDED RANGE QUARTER MOUNTED 4 SPKR SYS(UQ5)
VG3 STRIP,FRONT BUMPER IMPACT FRT BPR IMP STR(VG3) VXS VEHICLE - COMPLETE
V43 BUMPER,REAR STEP(PAINTED) PAINTED STEP BPR(V43)
V73 VEHICLE STATEMENT - US/CANADA US/CANADA VEHICLE STATEMENT(V73)
XNK Unknown
X88 MARKET BRAND CHEVROLET CHEVROLET(X88)(EXPORT)
YD3 AXLE FRONT (BASE EQUIP) FOR SCHEDULING GVW PLATE FRT AXLE(YD3)
YD6 SPRING,REAR(BASE EQUIPMENT) RR SPRING(YD6)
YNK Unknown
ZNK Unknown
ZY1 COLOR COMBINATION SOLID SOLID PAINT COMBO(ZY1)
Z83 CHASSIS PACKAGE,SOLID SMOOTH RIDE CHAS PKG(Z83)
1SA PACKAGE-OPTION 01 (1SA)
1SZ PACKAGE OPTION- (1SZ)
11U EXTERIOR COLOR,PEWTER MET (11U)
12C TRIM COMBINATION CLOTH, GRAPHITE © (92) CLOTH TRIM(12C)
12I INTERIOR TRIM GRAPHITE (12I)
6WY COMPONENT FRT LH COMPUTER SEL SUSP (6WY) SUSP(6WY)
7WY COMPONENT FRT RH COMPUTER SEL SUSP (7WY) SUSP(7WY)
AE7 SEAT,FRT SPLIT,EASY ENTRY EASY ENTRY SPLIT F/SEAT(AE7)
AM7 SEAT,REAR FOLDING RR FLDG ST(AM7)
C60 AIR CONDITIONER,FRONT,MANUAL CONTROLS A/C MAN CONT(C60)
C7H Unknown
DE2 MIRROR,OUTSIDE,LH & RH,DIRECT CONTROL,FOLDING,PAINTED O/S MIR(DE2)
EVA TEST DVT, EVAP EMISSION REQUIREMENT EVAP EMISSIONS REQUIRED(EVA)
E63 BODY EQUIPMENT,FLEETSIDE PICKUP BOX FLEETSIDE PUBX(E63)
FE9 FEDERAL EMISSION CERTIFICATION FED EMIS(FE9)
FK2 ARM,TORSION BAR,SPRING ADJUST,LH TORS BAR SPR ADJ ARM(FK2)
FK3 ARM,TORSION BAR,SPRING ADJUST,RH TORS BAR SPR ADJ ARM(FK3)
GMC PLANT CODE PONTIAC, MI, GM T&B PONTIAC,MI GM T&B ASSEMBLY PLANT(GMC)
GT4 AXLE,REAR,3.73 RATIO 3.73R(GT4)
G80 AXLE,REAR,POSITRACTION,LIMITED SLIP POSITRACTION L/SLIP R/AXL(G80)
JC5 BRAKE VAC POWER, 4 WHL DISC, 7,200 LBS BRK VAC PWR DISC(JC5)
K68 GENERATOR,105 AMPERE 105 AMP(K68)
LR4 ENGINE GAS, 8 CYL, 4.8L, MFI 4.8V(LR4)
M30 TRANSMISSION,AUTOMATIC 4 SPEED,4L60E,ELECTRONIC 4-SPD A/TRANS(M30)
NF2 EMISSION SYSTEM,FEDERAL,TIER 1 FED EMIS SYS(NF2)
NP2 TRANSFER CASE,MANUAL SHIFT CONTROL,TWO SPEED MAN SHFT TRFER CASE(NP2)
QNK Unknown SLM SALES PROCESSING - STOCK ORDERS

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Latest Articles

  • Posts

    • Atlas
      Wow I'm in a pickle. (Broke down truck) and a story.

      By Atlas · Posted

      Getting greedy...   The AC pump has been replaced at least once per service records, and it's been recharged twice since 2018 or so, in approximately 2 year intervals between those charges.   It was done at the same shop...clearly they were enjoying the revenue of recharging the system periodically versus actually tracking down and fixing the leak. I learned that the owner was 88 years old when she passed in 2023, so maybe they assumed only a temporary fix was needed anyway.   The system is basically empty now, the compressor spins freely, so I'm guessing it "just needs a recharge".   I vacuumed it down, and it has basically held overnight. Doesn't appear to leak under vacuum, check! So it must leak under pressure. I don't have a way to pressurize the system and pressurizing it with shop air wouldn't be great for the air dryer (which is probably toast anyway?)   The dryer (accumulator? I'm not an AC expert) has a Schrader valve, but the high side has an old ball-type valve, which are notorious for leaking. It's clearly had schmutz blown out of it at one point because the line/area next to the valve is coated old black crud, which I assume is AC refrigerant residue/oil, or maybe even dirty dye. I think I'll roll the dice and replace the valves. I have a black light around here somewhere so I'll find it and shine it around the engine bay in the dark to see if there's any dye.   I can't think of another way to track down the leak other than injecting some dye (if it doesn't have any) and having it charged up. We can't buy R134a off the shelf here anymore, so I'll run it up to Jiffy Lube and have them do it. I think I have a coupon. At the very least, the charge should last long enough for a year or two, according to history. I think this truck will be long gone by then. But cold AC is a selling point.    
    • clowe1243
      6.2L L87 Powertrain Engine Noise (Lifter Failure) Question

      By clowe1243 · Posted

      Got the truck back today.  Called them yesterday to get an update, and miraculously my truck is finished?!?! The $13k out the door was complete bullshit!  Ended up being over $14k.  They added some bullshit service bulletin that I cant even find, where they replaced my radiator without telling me or asking me, and charging me for it.  Need to do more research into it, cause they leaked the first delivered radiator was ran over by FedEX.  Sounds like bullshit to me. 2.5 Months for an engine swap, which ended up being remanufactured, not new; ****ing ridiculous.  Brakes are squishy as hell, not sure if its from sitting.  Will give a couple days to see it that figures it self out.  GAVE IT BACK TO ME WITH 1 GALLON OF GAS!  Just filled the tank the day before drop off, more bullshit.  My dash cam SD card was formatted, not really much I can do about that. 3 year, 100k GM warranty at least.  Time to sell it and say **** off to GM.  Bad experience.  Cant wait for the survey email to come through.  Overpriced Raptor R, here I come!
    • haoleboyZ71
      Radio Update

      By haoleboyZ71 · Posted

      If I forget the phone in the truck, and forget the truck in the phone, and reconnect.  It works great for the day.  Truck sits overnight, and the next day is a no go.  It will connect Android Auto via usb cable, but not bluetooth.   Ive tried Everything in this thread so far, and nothing works for more than a day.   I think I might have to go to the dealer and have them flash the pcm.   thanks for all the suggestions guys. 👍
    • Bill Lemmond
      primary drive belt tensioner

      By Bill Lemmond · Posted

      2022 2500HD Crew Z71 Duramax single alternator.  Recently had the primary (water pump / fan) belt tensioner pulley bearing to fail while hundreds of miles from home of course the plastic pulley melted and belt shredded which took out some wiring. Found a replacement tensioner assembly and belt to continue now would like to find a replacement for just the pulley and bearing to have a spare assembly in case of a repeat, the rest of the tensioner is fine. Has anybody here found a correct replacement part for just the pulley and bearing? Any help is appreciated.
    • Atlas
      Upgrade to a 2026 AT4 with the 3.0L Duramax

      By Atlas · Posted

      +1 for the 3.0   Perfect for 1500 pickup towing duties.   Perfect engine for a 1500 pickup period. Huge torque at stunningly low RPM makes it feel a lot lighter than it is. The fuel mileage is insane for a tall and heavy 1500... 30+ on the highway. Mid 20's around town.   It's probably not perfect if you bought a 6.2 for the braaaaaaapppppp V8 noises and wrapping it out to 6k. The LZ0 acts and sounds like a small turbo diesel and there's nothing you can do to make a small turbo diesel sound like a big one, and you can't make an inline diesel sound like a V8 diesel/big Duramax. It's a different driving experience altogether.   Drive one, I think you'll like it, though...

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...