LSD Oil/Vibrating vehicle
04-23-07, 12:02 AM
#1
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LSD Oil/Vibrating vehicle
I just bought a couple quarts of Mobile1 75W/90 gear oil for my LSD. Do I need a heavier oil, as the owner's manual suggested SAE90 or do I need an LSD oil additive? I would prefer Amsoil, but the Mobile1 is a lot easier to come accross, and I already bought it.
On an unrelated note, my car has begun to vibrate from 25mph upward. I've noticed that when I release the clutch too quickly, basically I feel a click in the shifter, like the engine or trans isn't the most secure. Could it be that a mount needs replacing, and that is causing the vibration? I just had my tires rotated and balanced. The vibration sounds like a low rumble, and is worst around 30-40 mph.
Thank you.
85 GSL-SE
On an unrelated note, my car has begun to vibrate from 25mph upward. I've noticed that when I release the clutch too quickly, basically I feel a click in the shifter, like the engine or trans isn't the most secure. Could it be that a mount needs replacing, and that is causing the vibration? I just had my tires rotated and balanced. The vibration sounds like a low rumble, and is worst around 30-40 mph.
Thank you.
85 GSL-SE
04-23-07, 02:17 PM
#6
I used lucas 75w90 in the LSD. I probably should've went a little heavier like 80w90. I just replaced the LSD oil like a month ago and forgot to put in the lsd additive, so, the car would shake on right and left turns from a complete stop. Added the additive and went away. All this has been covered in the search button though. God bless.
Last edited by twinkletoes; 04-23-07 at 02:23 PM.
04-23-07, 03:16 PM
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I don't believe that U-joints are available for my 85 Driveshaft/LSD. Either the trans mounts are worn, or I'll have to get a whole new driveshaft, more than likely? What about an LSD oil leak? I have a small leak in the diff. I don't know if that would explain anything, though.
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04-23-07, 03:50 PM
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Originally Posted by Slammed_GSL
Tranny mount and or drive shaft worn
I've never changed the fluids in there, don't even know how...
04-23-07, 11:01 PM
#9
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Those U-joints are still available, although sometimes shops will try to tell you that they are non-replaceable and try to sell you a rebuilt driveshaft. Check those first, because that's a serious safety issue, then check out the tranny mounts.
04-24-07, 12:20 AM
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Originally Posted by Jason Guthrie
My drive shaft had a single loose bolt. I thought my car was a gonner based on the crazy shaking. It was just a bolt lol.
I've never changed the fluids in there, don't even know how...
I've never changed the fluids in there, don't even know how...
Loctite is your friend with our cars.
04-24-07, 12:48 AM
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What is LSD additive and where do i get it. ive been looking for Strait SAE 90 and it has ended up being a wild goose chase can i use 85 90 or 75 90 with out any problems cause the manual makes it real clear to use only SAE 90
04-24-07, 02:09 AM
#12
Originally Posted by aFBatw!
What is LSD additive and where do i get it. ive been looking for Strait SAE 90 and it has ended up being a wild goose chase can i use 85 90 or 75 90 with out any problems cause the manual makes it real clear to use only SAE 90
04-25-07, 11:21 AM
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I had two quarts of Mobile1 synthetic 75W-90, but I just returned them as I have heard very little about it. It seems that most people prefer Redline, Amsoil, Royal Purple or Neo. All of the prices are about $9/quart, so I am guessing the quality can't be to different from one to the next. I have never seen the LSD Additive. Is there a certain type I should look for?
04-25-07, 11:40 AM
#14
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Originally Posted by Ovid213
Those U-joints are still available, although sometimes shops will try to tell you that they are non-replaceable and try to sell you a rebuilt driveshaft. Check those first, because that's a serious safety issue, then check out the tranny mounts.
As for the LSD additive, its just a friction modifier. You should be able to get it at any parts store. Just ask for gear oil friction modifier.
04-25-07, 11:56 AM
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Originally Posted by 85rotarypower
The later 83-85 cars DO NOT have replacable U joints. Thats why mazdatrix doesn't sell u-joints for the later cars, and only complete drive shafts. The 82 and older cars do have replacable u joints though.
04-25-07, 02:48 PM
#16
love the braaaap
Thats exactly why I made the comment I did about the driveshaft. The stock u-joints are very reliable and rarely go out, but if they did at some point, most likely the driveshaft is either a stock replacement, no replacable u joints, or a new one with replacable u joints.
