Rear diff wear measurment February 11, 2007, 12:16:52 AM we have gained a few more new members since i posted this question a long time ago,, ill shot this out there again.If i jack one rear wheel off the groundthen i rotate this wheel to the left and right as far as it will gowouldnt there be some sort of information to gather from how much i can move the wheel with reguard to rear end play.If i tape a string with a weight (plumb bob) to the fender well and let it hang almost to the ground,then i rotate the wheel as far as possible Clockwise and mark the wheel using the string as the referencetheni rotate the wheel CCW to its stop point and mark the wheel,wouldnt i have some sort of logical information here? the distance between the two upper edges of the blue marks should tell me something about wear and tear before i have a problem,,correct?I already know this would all depend on wheel / tire size so to remove the variable, using the stock 14'' rim to mark would probably be best. Perhaps there is a tool that is attached to the lug bolts that measures this like a dial indicator or such. Quote Selected
Rear diff wear measurment Reply #1 – February 11, 2007, 02:33:22 AM So this wouldnt work on an open diff, right? Quote Selected
Rear diff wear measurment Reply #2 – February 11, 2007, 10:48:24 AM Quote from: bhazard;128837So this wouldnt work on an open diff, right?your might as well be talking latin to me cause differential stuff is for me to learn about sometime down the road. all i know is that one time in Va Beach at "beach ford", the mech there jacked up my car via the rear diff and did something. A few days later i noticed a leak at my rear and found out that the on the floor jack caught the rear diff cover and that effected the seal.So,, i took the rear diff cover off , made a gasket, I stared at all the googlega inside there and said,,,, Humm, well ,, that all looks interesting. Then put the cover back on.Ive been smart enough not to mess with it cause i think there are many things a man needs to know prior to building a rear. From the past few years and talking with my brother in law who works at Dayna, its pretty clear to me that the rear diff is some pretty complicated stuff and calls for some "expert tuning" perse'.All i wanna know is how can you tell if you have excessive rear diff play,, or how do you do it? Quote Selected
Rear diff wear measurment Reply #3 – February 11, 2007, 02:34:08 PM Doing it the way you mentioned might show that there is excessive play in the whole setup (assuming you could ever find figures to compare your measurements to), but there are so many moving parts in there that you'd never know which combination of parts was giving you the slop.In an open diff (non-traction lock, or "one wheel peel", or "pegleg") you'd have some play from the left side gear, right side gear, and spider gears, on top of any play between the actual ring and pinion gears, plus any play in the driveline (U-joints, tranny output shaft splines, park pawl in the tranny).A traction lok diff, if not worn out, would show no movement at all unless both rear wheels are jacked up, and even with it jacked up you'd indicate the slop in the entire driveline, as above (the spider and side gears excepted, because with a traction lock rear you should have no movement between them unless you apply considerable force) Quote Selected
Rear diff wear measurment Reply #4 – February 12, 2007, 01:05:42 AM Check in your shop manual section:Driving axles and driveshaft-service:Clunk noise. Quote Selected
Rear diff wear measurment Reply #5 – October 06, 2007, 10:27:40 PM Quote from: softtouch;129019Check in your shop manual section:Driving axles and driveshaft-service:Clunk noise.finally while looking for some information that seems to not exist about control arm bushings,, i found my answer.basically,,raise one wheeljust measure 12'' from the center of your wheel and mark your tire.Rest a marking device on the fender and let it touch the mark on the tirenow rotate the tire left and right until mark is complete in length.1'' or less is good.more than one inch is bad. Quote Selected
Rear diff wear measurment Reply #6 – October 06, 2007, 11:10:53 PM I have not dug out the book again but I think they put some kind of clamp on the input to the diff so it can't move. So you don't see the drive shaft slop. Quote Selected
Rear diff wear measurment Reply #7 – October 07, 2007, 03:03:52 AM Quote from: softtouch;181245I have not dug out the book again but I think they put some kind of clamp on the input to the diff so it can't move. So you don't see the drive shaft slop.actually yes,, good point. I thought about that after i clicked submit.btw, if you come across an IPB on the front Control Arm, id like to know where its at. ,,,, but dont put it in this thread. Best to stick it in my control arm thread. thanks in advance if you do come across info. Quote Selected
Rear diff wear measurment Reply #8 – October 07, 2007, 11:44:57 AM Quote from: jcassity;128863Ive been smart enough not to mess with it cause i think there are many things a man needs to know prior to building a rear.Like someone who is good at the process... Quote Selected
Topic: Rear diff wear measurment (Read 1344 times)
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