Guys, something is wrong with my LSD I think. The car has no tranny in it right now, and I tried to push it to a new spot in my drive-way, but it won't budge. I lifted the rear end, and tried to turn the wheels to make sure my rear brakes hadn't siezed.... When I turn one wheel the other will turn with it for about 6 inches, but then it goes "clunk" and they then turn in opposite directions like if it was an open diff. WTF? Help me out.

And yes I searched

 

I fixed it! DAMN I'M GOOD
Heres what happened....the Dip-**** at the shop who took it all apart last time, left 2 of the bolts in the flange that attaches the the drive-shaft and they were like 80 % out so they kinda sagged a little in the holes and when I turned the wheels, the flange would turn like normal until the loose bolt-heads turned far enough to hit the ridges that are cast into the rear-end housing. And since the drive-shaft flange could no longer turn it bypassed the lsd. I pulled out those 2 loose bolts and BANG good as new. Now she just needs a good washing and the tranny put back in!
Later days

 

awesome!

 

I HEARD MY CAR WAS SUPPOSED to have lsd but they tend to break really easily and if i did have it i dont anymore...
ohhh well

 

WTF are you saying? You broke your gears now? What??????????????????????????

 

no hes saying how the lsds are supposed to go out after 50k or not work as well as it should....

 

I was thinking he busted the rear end, and thats why he doesn't have LSD.

Since when does the LSD break @ 50,000?

I have LSD and still works perfectly and I have over 310,000 on the same rear end. However I do change my fluid once a year, maybe thats why mine is still working.

 

I ONLY say what i hear lol ! evil aviator told me all of this lol! i guess im a sucker but it sounded good when he told me lol

 

when the LSD does wear out does it just act like a non lsd diff? or is the whole unit shot? I'm trying to get a GTUs rear, and I'm more interested in the ring and pinion then the LSD but it would be nice to know what to look for.

 

acts like the normal diff type with no lockup feature.

Sometimes you can tell if its bad, by the amount of foreign material in the gear oil. If its got alot, with pieces, its shot!

 

So in this case the whole unit is garbage? Do the ring and pinion wear out?

 

They do, but you need to inspect that. it may be good.

 

the LSD's can be rebuilt too... Clutch packes get replaced with new ones and the backlash and such should be checked on the R&P gears.

Rear ends tend to last a long time if they're set up correctly and not abused too much. (too much power and it will detonate the pinion or the spider gears in the diff)

I'm curious as to what the diffs are rated at power wise. I searched a few weeks ago before puttiing in my LSD from a GXL and couldn't find any info.

 

Rear diff assemblies

I have yet to see a worn out ring and pinion on any Fc. As for the rear LSD units the disc / clutch type CAN wear out. The disc / clutch type work better then the viscous LSD units, reason being.......the disc / clutch type tranfer power to the wheel with less grip more gradually and smoother then viscous types. Viscous types tend to have one wheel actually loose traction momentarely before the LSD unit transfers the power to the wheel gripping, disk / clutch types dont do this and doesnt require a wheel to loose traction before it works, there for the hardcore racer types prefer the clutched LSD's. For a street driver you'll probly not be able to notice the difference between the 2 and the viscous is the type to have do to NO maintance / adjusting except changing fliud. The clutch / types can and do go out of adjustment and need to be adjusted / shimmed or have clutch packs replaced. The 86-88 Rx-7's (turbo's, Sports,GXL's) came with clutch LSD's while the 89-91's (Turbo's, GXL's, GTUs) came with viscous LSD's. So SAMPS, don't worry, the rear end I'm selling you (GTUs) is viscous, they dont wear out, and there is no excessive slop in the pinion / ring gears (theres suppossed to be some slop). The car it came out of was stock, no power mods.

~Mike.......

 

Since were speaking about rearends, my wifes..........sorry lost my train of thought ..Is ther a big difference from the 4.11 and the 4.30 Im thinking about changing ring and pinion. thanks

 

its enough to raise your engine rpms at any speed up a few hundred revs. it really depends on what size tires and what tranny you have. all of them form the package which either works well for your type of driving or doesnt. If you lower the gearing too much you can potentially negate the use of 1st gear. I switched from 2.73's to 3.55's in my bmw and was shifting out of 1st at 18mph. It also reduced my top speed from 135 to 106. But on the twisties, I was always on the power and would school 300hp cars all day long.

You need to decided what you want out of the gearing.

 

hehe; I never thought the unit would be bad (I did some research on ya) but I just like to know. I really just want the gearing; the LSD is just an added benefit regardless of which type it is. Either is better than the non-LSD in my vert.