grind noise in 4WD
#1
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grind noise in 4WD
Hey all! I'm trying narrow down a noise I'm getting in 4wd. Truck is an 87 4runner with SAS and stock 22re, manual trans. When I'm in 4 low or high and going more than 5-10 mph I start getting a steady grinding noise that will get worse with more speed. It will make the noise if the hubs are locked or free. I pulled the front drive shaft and the noise goes away. I have drained the oil in my t-case and front diff and didn't find any chunks of metal in either one. I put the front of jack stands and with the hubs locked I can spin the tires freely with my hands and nothing feels like it binding up. I'm just trying to see if anyone with much more experience than I have can maybe point me in the right direction before I pull and disassemble my t-case or 3rd member. Thanks in advance for any help.
update with further testing, I have the noise in 2wd with the front hubs locked and the driveshaft installed. If I remove the front driveshaft the noise stops with the hubs locked and unlocked. Im going to replace my ujoints to have that eliminated as a potential problem.
update with further testing, I have the noise in 2wd with the front hubs locked and the driveshaft installed. If I remove the front driveshaft the noise stops with the hubs locked and unlocked. Im going to replace my ujoints to have that eliminated as a potential problem.
Last edited by NoahVD; 04-03-2017 at 10:12 PM.
#3
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I can't speak for the condition of all the axle internals because I bought the truck like this. Judging by the axle gusseting its probably an 84 85 axle. It has stock locking hubs and when I had the front up on Jack stands the tires would spin in opposite directions indicating an open diff
I'll double check tonight but I don't think I have the noise if I drive in 2wd with the front hubs locked.
I'll double check tonight but I don't think I have the noise if I drive in 2wd with the front hubs locked.
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Updating status. I have inspected the birfs and the front 3rd member and they all seem to be in good shape. I have pulled the t-case and opened that up and everything looks good in there and spinning really smooth. After reading about some things I am now wondering if its my driveline angles in relationship to my axle orientation and no CV shafts. My front pinion is flat but my rear is pointed up to my t-case without a CV.
#5
Glad it's gone. I've got just the opposite. Mine goes away when 4H is engaged. Doesn't start until 50mph sounds like I'm driving with mudders on. I hope it's not front differential bearings.