4wd binding up
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Freshman User
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4wd binding up
hello all, new to forums. just put a salvage yard front diff in my 94 4.0 ranger. when i checked it, I drove it a couple of feet and it seemed to bind up. got a little worried and just disengaged 4wd. I think my rear diff is a 3.73. is it possible I got the wrong front one to match. The rear has tag to id but the front doesnt. please help!
Fleet Mechanic
Joined: Aug 2002
Posts: 1,344
Likes: 12
From: Sioux Falls SD
If the tags are missing, only way to be sure is to count the teeth on the ring and pinion gears.
You can get close by jacking up truck and rotating a front tire while counting how many times the front drive shaft turns to one wheel rotation, then do the same in back.
Have tranfer case in two high with hubs locked and transmission in fourth gear for the 1:1 ratio.
You can get close by jacking up truck and rotating a front tire while counting how many times the front drive shaft turns to one wheel rotation, then do the same in back.
Have tranfer case in two high with hubs locked and transmission in fourth gear for the 1:1 ratio.
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thanks 99 f150. Turns out the rear is a 3.27. Checked the truck I got the front diff off of and it is a 3.73 limited slip. I am going to get the rear from the truck I got the front from. Is limited slip is better than not having it? I was told it is better. Should the rears change out without any problems? Its coming off a 94 4.0 ext cab. Mine is a 94 4.0 standard cab. Any help would be greatly appreciated
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Installed rear today to match the front diff. All went well except will be looking for new driveshaft monday. Sore subject. Anyway, want to change fluids in front and rear diff. Can anyone tell me what fluids and how much go into a 3.73 limited slip diff. And does the front get friction modifier also? Also want to change fluid in 5 sp trans and transfer case.
Postmaster
Joined: Jan 2009
Posts: 4,584
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From: Chesapeake, Va.
Traction Un-lock?
Installed rear today to match the front diff. All went well except will be looking for new driveshaft monday. Sore subject. Anyway, want to change fluids in front and rear diff. Can anyone tell me what fluids and how much go into a 3.73 limited slip diff. And does the front get friction modifier also? Also want to change fluid in 5 sp trans and transfer case.
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Laughing Gas
Joined: Aug 2003
Posts: 1,175
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From: So. Cal.
Actually, I think you have it backwards. The friction modifier is called for to prevent clutch chattering, which would indicate that it makes the clutch slip easier.
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Thanks for all the helpful replies. Today I put valvoline 85-140 in rear diff with 4oz friction modifier. This info came from local dealer. In the trans and transfer case I put mercon5. I found this on a previous thread. Does all this sound correct? Right now I have 80w in front diff but am considering changing it because someone told me front diff fluid should match the rear diff fluid. Think this is necessary?
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