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tinny noise coming from Eaton Rear #1325688 Wed Sep 11 2019 12:17 AM
Joined: Apr 2012
Posts: 153
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03marauderman Offline OP
Shop Shark
Well after finally accomplishing my wheel dilemma on my 70 C30, I took it for its maiden voyage.... Had to run an errand at Lowes....While in the lot, I made a hard left with basically the left rear wheels pivoting and the right rear wheels making the swing...I heard a very unusual tinny clanking noise I never heard before. I drove home with no incident.....The truck has a Posi 4:56 rear.....I double checked the lugs & they were tight...???

Re: tinny noise coming from Eaton Rear [Re: 03marauderman] #1325691 Wed Sep 11 2019 12:40 AM
Joined: Feb 2004
Posts: 19,258
H
Hotrod Lincoln Offline
Boltergeist
That's normal for a limited slip carrier in a tight turn. What kind of lubricant are you using? GM and Ford used to have a 6-ounce additive that had to be used with the ones with cone clutches. If you've got the Detroit Locker carrier, the two pieces that lock together ratchet over each other and make a clicking noise if a tight turn is made with power off the engine. If moderate to heavy throttle is applied, both axles lock together and the vehicle tries to go whatever direction the rear axle is pointed.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: tinny noise coming from Eaton Rear [Re: 03marauderman] #1325693 Wed Sep 11 2019 12:51 AM
Joined: Apr 2012
Posts: 153
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03marauderman Offline OP
Shop Shark
Embarrassed to say, I never changed the fluid in the rear, or transmission...Thanks for bringing it to my attention...while on the subject...what fluid would you recommend?...I guess hard surfaces (blacktop/concrete) and lets say soft surfaces (dirt road) would have a different effect whether the noise is heard or not??.....When I changed the gear oil in my sons 2000 Ram a few years back I obtained an additive from the dealer, so I'm guessing this is what your making reference to......So this noise is nothing to be concerned about? I haven't heard it since.....As usual your expertise is always appreciated......

Re: tinny noise coming from Eaton Rear [Re: 03marauderman] #1325707 Wed Sep 11 2019 01:17 AM
Joined: Feb 2004
Posts: 19,258
H
Hotrod Lincoln Offline
Boltergeist
The normal 90 weight "multi-purpose" gear lube would be fine for that rear end. It's got the hypoid additive needed for proper lubrication of the ring and pinion that the "mineral oil" lube for transmissions doesn't have. The cone clutch limited slip rear ends have a bad shudder when the additive isn't used. If yours is just making a rapid click, it will do the same thing with the additive, also. The difference is that the Detroit Locker actually mechanically joins the axles together- - - -it doesn't use clutches. Another place the locker was used was in the GT-350 Hertz Mustangs, and it really spooked some of the people who rented those cars.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: tinny noise coming from Eaton Rear [Re: 03marauderman] #1325714 Wed Sep 11 2019 02:08 AM
Joined: Apr 2012
Posts: 153
0
03marauderman Offline OP
Shop Shark
So the transmission uses 'mineral oil'? - not the same 90 weight as the rear? - yeah GT 350 Hertz Mustangs....sure was/is a winner.......

Re: tinny noise coming from Eaton Rear [Re: 03marauderman] #1325721 Wed Sep 11 2019 03:00 AM
Joined: Dec 2006
Posts: 134
E
Elderly Iron Offline
Shop Shark
"Mineral oil" refers to the base stock from which the lubricant was derived, as opposed to "synthetic". Not the clear stuff at the pharmacy!

Re: tinny noise coming from Eaton Rear [Re: 03marauderman] #1325723 Wed Sep 11 2019 03:13 AM
Joined: Feb 2004
Posts: 19,258
H
Hotrod Lincoln Offline
Boltergeist
The extreme pressure lubricants intended for use in Hypoid-gear rear axles can interfere with the operation of the synchronizer rings in some transmissions with heavy gears that require a lot of braking to prevent grinding while shifting- - -like the SM-420, for instance. Back when I was doing a good amount of repair on Fuller Roadranger transmissions I could tell which ones had used multi-purpose lube- - - -the synchronizers would be blackened by carbon deposits caused by slippage and overheating of the brass synchronizer rings.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: tinny noise coming from Eaton Rear [Re: 03marauderman] #1325739 Wed Sep 11 2019 11:47 AM
Joined: Apr 2012
Posts: 153
0
03marauderman Offline OP
Shop Shark
OK - Just to be clear...What brand, or number specifications should I be looking for on the transmission...I have 2 trucks that I will need to service.....

Re: tinny noise coming from Eaton Rear [Re: 03marauderman] #1325751 Wed Sep 11 2019 02:11 PM
Joined: Dec 2006
Posts: 134
E
Elderly Iron Offline
Shop Shark
Royal Purple 75W90

Re: tinny noise coming from Eaton Rear [Re: 03marauderman] #1325758 Wed Sep 11 2019 02:26 PM
Joined: Jan 2013
Posts: 1,520
S
sstock Offline
Shop Shark
90Weight Mineral oil from NAPA


1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
https://www.youtube.com/watch?v=Bli...n05i04t1aokgm4p04jiwgffwhyyih5xbk0h00410
1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration
Re: tinny noise coming from Eaton Rear [Re: 03marauderman] #1325764 Wed Sep 11 2019 03:07 PM
Joined: Feb 2004
Posts: 19,258
H
Hotrod Lincoln Offline
Boltergeist
Ditto on the NAPA mineral oil for use in transmissions. Regular 90 weight "multi-purpose" gear lube or synthetics like 75W-90 or 85W-120 work well in rear ends, NOT older transmissions.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: tinny noise coming from Eaton Rear [Re: 03marauderman] #1328281 Mon Sep 30 2019 07:04 PM
Joined: Nov 2000
Posts: 1,729
F
Frank50 Offline
Shop Shark
The Detroit Locker actually replaces the differential carrier and gears. Since your truck is a C30, it probably has a locker rather than a positrac. The clicking sound is normal.


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