Click here to visit LS1Tech
Click here to visit Performance Trucks
Click here to visit Mod Motor Tech
Click here to visit Modern Hemi

PerformanceTrucks.net Forums  

Go Back   PerformanceTrucks.net Forums > GENERAL MOTORS SPECIFIC FORUMS > Classic Trucks
Sign in using an external account
Register Forgot Password?
Register Albums FAQ Members Calendar Search Today's Posts Mark Forums Read VendorsUsed CarsGarageStore TSBs & Recalls
Welcome to PerformanceTrucks.net Forums

Reply
 
LinkBack Thread Tools Search this Thread
Old 01-15-2012, 07:08 AM   #1
Trader Rating: 0
TECH Apprentice
 
TrickyTransAm's Avatar
 
Join Date: Feb 2005
Location: Michigan
Posts: 306
Send a message via AIM to TrickyTransAm
Default 88-94 Front Diff Oil type?

I'm working on my co-workers 1988 GMC Sierra 1/2 Ton K1500 and I want to change the oil in the front 4wd differential.

Does anybody know what type of oil/fluid goes in these? 75W-90? 30W? ATF?
It seems that there's a lot of information out there but all different so far.

Also, I replaced the actuator motor but it still is extremely slow to engage.
Not sure if its because its low on fluid....or if there's some other reason it would engage so slow.
Anybody have experience with this?

Is it an amperage issue where a higher amp alternator could help this slow engagement?
Newer battery and replacement amperage alternator on the truck (I believe it to be a 95amp)

Any help is greatly appreciated.
__________________
"Michigan No Fault - Better off Drivin Junk"

My 5.3L to 6 Liter LQ9 conversion pictures step by step
TrickyTransAm is offline   Reply With Quote
Old 02-04-2012, 12:05 PM   #2
Trader Rating: 0
TECH Apprentice
 
TrickyTransAm's Avatar
 
Join Date: Feb 2005
Location: Michigan
Posts: 306
Send a message via AIM to TrickyTransAm
Default

Anyone???

Has no one changed their front diff fluid??
__________________
"Michigan No Fault - Better off Drivin Junk"

My 5.3L to 6 Liter LQ9 conversion pictures step by step
TrickyTransAm is offline   Reply With Quote
Old 02-05-2012, 08:45 AM   #3
Trader Rating: 4
TECH Resident
 
Join Date: Jan 2011
Location: Bonnyville Alberta
Posts: 750
Default

Quote:
Originally Posted by TrickyTransAm View Post
Anyone???

Has no one changed their front diff fluid??
Use 75W90 or 80W90 gear oil in the front diff. It's no different than the 8.25" IFS under a 2012 for all intents and purposes.

Transfercase will take ATF.

Being it's an 88 it uses a thermal actuator and they are complete POS. Did you put in an electric one or another thermal style? You can get the newer style electric actuator and harness to replace it, or a Posi Lock cable system. Your choice. The thermals always were slow, right from day one. I guess make sure the collar moves freely in the front diff as well that connects and disconnects. Low on oil wouldn't help the situation at all.
__________________
2005 GMC 1500HD 4X4; 07 E fans, MIT, 08 Air box/fender mod, Flo Pro, EFILive custom tune, 4.10's and Detroit Locker.
2004 GMC 2500 LD crew cab 4X4 ( so another 1500HD). KB 76/75, Forged 370/ported 243's/TBSS intake( still waiting........), Yank Triple disc 3K convertor. Currently e fans, MIT, 08 box, Tune by me, 4.10's
2013 F150 FX4 SCrew. 6.2/3.73's. SCT but soon to be HP tuners tuned by me.
1994Vmax is offline   Reply With Quote
Old 02-05-2012, 08:45 AM
PerformanceTrucks
Ford F150




Paid Advertisement
Reply

Tags
1988, 4x4, 88, 94, add, axle, diff, differential, fluid, front, gmc, k1500, kind, oil, sierra, weight


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 05:05 PM.

 



Powered by vBulletin® Version 3.7.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
SEO by vBSEO ©2010, Crawlability, Inc.

PerformanceTrucks.net and InternetBrands, Inc. are not affiliated with the Ford Motor Company