Recent Topics
Which Tire Repair Kit?
by BlindBaby
06/27/17 12:23 PM
You know your car isn't driven often when...
by Astro14
06/27/17 12:16 PM
Strange brake feeling in my Accord
by Bottom_Feeder
06/27/17 12:12 PM
Love old oil commercials ....change oil every 1k
by gmh101357
06/27/17 11:54 AM
T-Minus 10 Days to Adventure
by SKVenture
06/27/17 11:52 AM
Bosch 0 451 103 029 vs Motorcraft EFL90?
by FordCapriDriver
06/27/17 10:54 AM
Wix/Napa Gold 1311 defects?
by gsellstr
06/27/17 10:34 AM
does "wrapping" a car influence heat dissappation?
by 555
06/27/17 10:20 AM
LT Wheels Getting Bigger and Bigger and Bigger
by SubLGT
06/27/17 10:09 AM
Honda varadero 2002 - 122.000Kms
by Torres
06/27/17 09:30 AM
Hi Temp Threadlocker
by Rtstrider
06/27/17 09:17 AM
73-74 Torino's Havoline 30wt
by gmh101357
06/27/17 08:43 AM
New pressure washer - Honda vs Subaru engine
by volk06
06/27/17 08:25 AM
Honda HS1132 oil recommandation
by jbutch
06/27/17 07:50 AM
Gen4 Subaru Outback, High Mileage Synthetic OCI?
by pilot1226
06/27/17 06:11 AM
Mazda2 2nd gear synchro Failure?
by SiRDOHC
06/27/17 06:06 AM
The America's Cup.
by Silk
06/27/17 04:24 AM
Honda A02 and FRAM XG7317 Cut Open and Compared
by HX520W
06/27/17 12:27 AM
Fan falls during race against the Freeze
by Skid
06/26/17 11:40 PM
Amsoil 75-90 GL-4
by Bullet
06/26/17 08:59 PM
Newest Members
perplexed, TroyHayesDoyle, blueeyedme, anomalia, pack_run
61982 Registered Users
Who's Online
86 registered (28oz, AlaskaMike, Andrei, 555, Alex_V, 02s4audi, 6 invisible), 2385 Guests and 23 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
61982 Members
66 Forums
267105 Topics
4417756 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Topic Options
#2417308 - 10/26/11 07:50 PM 1998 z71 front &rear diff's
Jaybird79 Offline


Registered: 11/01/10
Posts: 7
Loc: Illinois
Hi does anybody know if i can run Mobil 1 75w90 in both the front and rear differentials in this truck? Also do i need to put any LS additive in either one,it does have the Eaton G80 in the rear.

Top
#2418125 - 10/27/11 05:45 PM Re: 1998 z71 front &rear diff's [Re: Jaybird79]
artificialist Offline


Registered: 09/23/07
Posts: 8440
Loc: Florida
What does your owner's manual say your truck needs?
_________________________
2010 Lancer Ralliart Sportback

Top
#2418283 - 10/27/11 08:40 PM Re: 1998 z71 front &rear diff's [Re: Jaybird79]
Fazzone Offline


Registered: 08/17/09
Posts: 104
Loc: Mondovi Wisconsin
Yes, you should be fine. I had no issues in my last truck('98 GMC 1500 Z71) running it. As far as the LS additive, mine didn't need it, but I don't recall specifically which rear end was in it. The manual specs call for conventional in the front, but if you want to spend the extra $ go for it.
_________________________
2012 GMC 2500 HD

Top
#2418285 - 10/27/11 08:40 PM Re: 1998 z71 front &rear diff's [Re: Jaybird79]
Jaybird79 Offline


Registered: 11/01/10
Posts: 7
Loc: Illinois
SAE 80w90 GL-5 gear oil front and rear.

Top
#2418463 - 10/28/11 05:55 AM Re: 1998 z71 front &rear diff's [Re: Jaybird79]
NHHEMI Offline


Registered: 07/06/07
Posts: 6558
Loc: NH
Originally Posted By: Jaybird79
Hi does anybody know if i can run Mobil 1 75w90 in both the front and rear differentials in this truck? Also do i need to put any LS additive in either one,it does have the Eaton G80 in the rear.


You can run 75W90 synthetic in both and it would be an upgrade. No LS additive required with the G80 but if the fluid you select has it don't worry. It will still work fine.
_________________________
Proud user of Royal Purple products thumbsup

Top
#2418503 - 10/28/11 07:49 AM Re: 1998 z71 front &rear diff's [Re: Jaybird79]
Jaybird79 Offline


Registered: 11/01/10
Posts: 7
Loc: Illinois
Thanks NHHEMI, just wanted make sure it would be okay. I can get the mobil 1 for about $4.00 a qt at AAP so I thought why not upgrade.

Top
#2419234 - 10/28/11 09:25 PM Re: 1998 z71 front &rear diff's [Re: Jaybird79]
wtd Offline


Registered: 06/25/02
Posts: 1774
Loc: southwest Mo.
I run shell coventional 80W-90 gear oil in my 98 Z71 but used to run Mobil 1 in both diffs. It might just be a coincidence but I had to have my rear end rebuilt at 75,000 miles with hardly any towing or hauling. After that I went back to conventional and now at 120,000 miles, no problems. I first started hearing noises at about 55,000 miles but could not figure out what it was and finally had it looked at professionally which ended up with the repair. Others have had good luck with it so for that price you might as well try it.

Wayne
_________________________
2014 Mustang GT
1998 Chevy K3500
1998 Chevy K1500
(2) 1992 Cavaliers
1970 Monte Carlo

Top