Rear Diff Oil and Addititve? - Ford Ranger Forum

MBMNemesis · 10-07-2009, 06:43 PM

01 Ranger Edge 3.0
I just had to put a new rear diff cover on because mine rusted through, I put the 5 quarts of gear oil in(80w90) and everything is working fine, no jarring or noise during turns or operation. However im not sure if the truck is posi or not and was told that an additive was needed for posi, is my truck posi, what additive should I use? I guess I can just burn out in the lawn to find out for sure, Id rather keep it nice tho. Thanks for suggestions

junior · 10-07-2009, 11:25 PM

What does (did) the axle tag say? The 7.5 axle only takes about 2, maybe 2.5 quarts of lube.

MBMNemesis · 10-08-2009, 12:09 AM

Tag says exactly as follows S330E
4 10 88 1A02

bowmaster85 · 10-09-2009, 02:12 AM

if you jack up the rear end of the truck and turn the one wheel the other shoul turn the same distance. It would also help if you had someone else holding the other wheel to put resistance on it. If your wheel will turn while the other person can hold the wheel with ease, then not posi. if the other person has to put the same amount of force to keep it from spinning as you do spinning it then its a posi. I have never heard of a oil additive for the posi. I know that in my race car we run a posi and run a full synthetic gear lube to make sure the plates get enough lubrication.

junior · 10-09-2009, 10:27 PM

that means 8.8" axle, 4.10 ratio, standard differential. an "L" on the tag would indicate a locker. you had the cover off, what was inside?
"friction modifier" , used in clutch pack type posi's has been around since at least the early 60's. I suppose it's possible that the newer metals and machining processes don't need it, but I don't know that for certain.

rangerdude91 · 05-01-2011, 07:48 PM

the 4.10 ratio axels take 75/140 with an additive, and the 3.75 ratio takes 80/90 with the additive as well

redrocket · 05-01-2011, 08:31 PM

80/90 gear oil dont matter what ratio you got

EricFi1 · 05-19-2011, 05:12 PM

I just did my 93 with 8.8".. used 2.5qts of valvoline regular 80w-90 and this time Redline Friction modifier (4oz). Last time I used the Motorcraft friction modifier.
No issues.

kozal01 · 05-20-2011, 07:01 AM

you only need the friction modifier if you have the trac-loc limited slip.

EricFi1 · 11-13-2011, 05:06 PM

I do.

10-07-2009, 06:43 PM	#1
MBMNemesis Junior Member Join Date: Sep 2009 Posts: 9	Rear Diff Oil and Addititve? 01 Ranger Edge 3.0 I just had to put a new rear diff cover on because mine rusted through, I put the 5 quarts of gear oil in(80w90) and everything is working fine, no jarring or noise during turns or operation. However im not sure if the truck is posi or not and was told that an additive was needed for posi, is my truck posi, what additive should I use? I guess I can just burn out in the lawn to find out for sure, Id rather keep it nice tho. Thanks for suggestions

10-08-2009, 12:09 AM	#3
MBMNemesis Junior Member Join Date: Sep 2009 Posts: 9	The tag says Tag says exactly as follows S330E 4 10 88 1A02

10-09-2009, 02:12 AM	#4
bowmaster85 Junior Member Join Date: Oct 2009 Location: Florida Posts: 14	if you jack up the rear end of the truck and turn the one wheel the other shoul turn the same distance. It would also help if you had someone else holding the other wheel to put resistance on it. If your wheel will turn while the other person can hold the wheel with ease, then not posi. if the other person has to put the same amount of force to keep it from spinning as you do spinning it then its a posi. I have never heard of a oil additive for the posi. I know that in my race car we run a posi and run a full synthetic gear lube to make sure the plates get enough lubrication. __________________ Dubbed "Danger Ranger" 1997 Ford Ranger slight mods, more to come!!!

05-01-2011, 08:31 PM	#7
redrocket New and loving it Join Date: Feb 2011 Location: waynesville nc Posts: 28	80/90 gear oil dont matter what ratio you got __________________ 2000 Ford Ranger Xlt 4.0, 5-speed 4x4 ext cab 1988 ford ranger 5.0 v8, auto 4x2 reg cab

05-20-2011, 07:01 AM	#9
kozal01 Senior Member Join Date: Feb 2011 Location: By the lake Posts: 117	you only need the friction modifier if you have the trac-loc limited slip. __________________ 2001 Stepside 4x4 4.0 SOHC 5 speed auto a few mods

10-07-2009, 11:25 PM	#2
junior Junior Member Join Date: Oct 2009 Posts: 2	What does (did) the axle tag say? The 7.5 axle only takes about 2, maybe 2.5 quarts of lube.

10-09-2009, 10:27 PM	#5
junior Junior Member Join Date: Oct 2009 Posts: 2	that means 8.8" axle, 4.10 ratio, standard differential. an "L" on the tag would indicate a locker. you had the cover off, what was inside? "friction modifier" , used in clutch pack type posi's has been around since at least the early 60's. I suppose it's possible that the newer metals and machining processes don't need it, but I don't know that for certain.

05-01-2011, 07:48 PM	#6
rangerdude91 Junior Member Join Date: Apr 2011 Posts: 1	the 4.10 ratio axels take 75/140 with an additive, and the 3.75 ratio takes 80/90 with the additive as well

05-19-2011, 05:12 PM	#8
EricFi1 Junior Member Join Date: May 2011 Location: SF Bay Area, CA Posts: 24	I just did my 93 with 8.8".. used 2.5qts of valvoline regular 80w-90 and this time Redline Friction modifier (4oz). Last time I used the Motorcraft friction modifier. No issues.

11-13-2011, 05:06 PM	#10
EricFi1 Junior Member Join Date: May 2011 Location: SF Bay Area, CA Posts: 24	I do.

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