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differential questions
#1
curtis7420 Avatar
curtis7420 Curtis Wright
University City, MO, USA   USA
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1975 MG MGB "The "B"
2003 Toyota Highlander 4WD
2010 Jeep Wrangler
So I've had some 90 weight gear oil on the shelf for a while. I was under the car today, for another issue, and took a look at my differential. First thing I noticed it that it must be leaking due to all the crud on it, I couldn't even see the plugs at first. Once I did uncover them I could see that the plugs are different than those on the tranny. Is this normal? What tool, and size tool, do I use to get them off? And yes I know to make sure the fill plug comes off before opening the drain.

TIA.


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Re: differential questions
#2
9146 Avatar
9146 rick dentel
yardley, PA, USA   USA
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1970 Porsche 914
1978 MG MGB
1998 Jeep Cherokee
2001 Jeep Cherokee    & more
3/8 extension you may have to grind it a little. Use GL4 not GL5 gear oil.

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Re: differential questions
#3
TonyV Avatar
TonyV Tony V
Rutherford, NJ, USA   USA
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1974 MG MGB
I believe the size is roughly 1/2 inch. I took a cheap 1/2" socket extension (maybe 3/8" I forget) and took a little off of 2 sides of the square end with my grinder for a prefect fit.

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Re: differential questions
#4
curtis7420 Avatar
curtis7420 Curtis Wright
University City, MO, USA   USA
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1975 MG MGB "The "B"
2003 Toyota Highlander 4WD
2010 Jeep Wrangler
In reply to # 2828354 by 9146 3/8 extension you may have to grind it a little. Use GL4 not GL5 gear oil.
Thanks

I just looked and I do indeed have GL5. What's the difference? Will it hurt to use what I have? Of course it wasn't expensive so its not a huge deal to get the other, but just wondering, and trying to save a trip as well.



Edited 1 time(s). Last edit at 2014-10-19 06:39 PM by curtis7420.

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Re: differential questions
#5
mgv8glen Avatar
mgv8glen Glenn Towery
Dover, DE, USA   USA
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1974 MG MGB GT
1/2 inch not 3/8

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Re: differential questions
#6
joron Avatar
joron Silver Member Michel Joron
Roxboro, QC, Canada   CAN
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1977 MG MGB "Victoria"
2018 Jaguar XE "Meghan"
GL5 is not a replacement for GL4 gear oil. The GL5 is not good enough to protect the sensible metal (bronze) in the MG' rear axle only GL4 is capable.

You could only put GL4; you could go where there is farming tractor part, motocycle part to buy some, I know in Montreal it was difficult to find some I have to order one week in advance from NAPA store they don't have that in stock normally or you could go penzoil lube express they could change the oil in 20-25 minutes they have GL4 in most of their store.


1977 MGB Red 'Victoria' and 2018 Jaguar XE 'Meghan'
All Classics:
Married, 2 children, MG MGB May to December, Jaguar the rest of the year.

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Re: differential questions
#7
curtis7420 Avatar
curtis7420 Curtis Wright
University City, MO, USA   USA
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1975 MG MGB "The "B"
2003 Toyota Highlander 4WD
2010 Jeep Wrangler
so....i went looking, on-line, at Napa, Advance Auto and Autozone and yes, the GL4 is not easily found. I did see that there is some synthetic made by Valvoline that says it's for GL4 and 5. i'm guess that will work?

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Re: differential questions
#8
ingoldsb Avatar
ingoldsb Silver Member Terry Ingoldsby
Calgary, AB, Canada   CAN
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1971 MG MGB
As long as it says it meets GL4 specs, you should be good. For instance, Royal Purple's MaxGear oil states:
Quote: Max Gear is recommended for use in truck and automotive front or rear differentials, manual transmissions and lower gear units of marine engines that specify use of an API GL-5 or GL-4 fluid. It is non-corrosive to soft yellow metals (brass, bronze, copper, etc.) and synchronizer safe. Specially designed to extend gear and bearing life, Max Gear provides superior corrosion protection over competing conventional and synthetic gear oils.


Terry Ingoldsby
terry.ingoldsby@DCExperts.com

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Re: differential questions
#9
Basil Adams Avatar
Basil Adams Platinum Member
About 12 miles from Sears Point, CA, USA   USA
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1/2" is sometimes a tight fit. If yours is, a wobble extension fits in easily. Best of luck. Basil 707.762.0974 basiladams@yahoo.com


Basil C. Adams
1956 MGA Coupe (Show Car)
1957 MGA Roadster (Driver)
1958 MGA Coupe (Racecar)
1959 MGA Coupe (unrestored)
1960 MGA Coupe (unrestored)
1960 MGA Roadster (Driver)
MKIII Elva Courier (E1056)
1967 427 Cobra
1972 Alfa Romeo Montreal
A coupla late MGBs
1960 Austin Healy BN7
More Cars than Brains

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Re: differential questions
#10
ErnieY Avatar
ErnieY Ernie Y
Albatera, Alicante, Spain   ESP
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1976 MG MGB GT
The plugs are tapered internally and there are proper tools for the job.


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Re: differential questions
#11
MGB567 Avatar
MGB567 Barrie Braxton
Ninderry, KabiKabi country, Queensland, Australia   AUS
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1966 MG MGB MkI "Money Guzzler"
1979 MG MGB GT V8 Conversion "Darkside"
Just as well I checked you had the right tool Ernie after all it's been discussed a fair few times. FWIW as noted previously replacement plugs #6k499 appear to be counter sunk hex

.


Mk1: CKD 11/66 first registered 8/5/67; owned since 3/77. 18GB +40 balanced. Peter Burgess BVFR head. Piper 285. 123. FidanzaFW. 4synch c/r box. Lots more as I did a nut and bolt rebuild; finished 2015. Tartan Red.

GT: December '78. VW Golf guards, flush fit front and rear valances. Torana XU1 vents, frenched indicators & Mk1 rear lights. 'Worked' Rover V8 with Monsoon ECU for EFI. GM4L60E, Lokar tiptronic & Quick4 controller. Vintage Air A/C. FC IFS. CCE 4 link rear. Salisbury with Quaife. Jaguar Storm.

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Re: differential questions
#12
ErnieY Avatar
ErnieY Ernie Y
Albatera, Alicante, Spain   ESP
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1976 MG MGB GT
The tool is correct for the standard plugs Barrie and that is what Curtis has but if yours or those of others have been replaced with something else then that is of course a different matter.

The replacement in your photo doesn't even look to be tapered.

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Re: differential questions
#13
MGB567 Avatar
MGB567 Barrie Braxton
Ninderry, KabiKabi country, Queensland, Australia   AUS
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1966 MG MGB MkI "Money Guzzler"
1979 MG MGB GT V8 Conversion "Darkside"
No IIRC it's not tapered Which is a bit odd as it seems that you could just tighten it through the diff casing - I stopped tightening when it was flush. That's what MGOC sent when I was ordering from them and that's a #6K499 as used on both diffs.


Mk1: CKD 11/66 first registered 8/5/67; owned since 3/77. 18GB +40 balanced. Peter Burgess BVFR head. Piper 285. 123. FidanzaFW. 4synch c/r box. Lots more as I did a nut and bolt rebuild; finished 2015. Tartan Red.

GT: December '78. VW Golf guards, flush fit front and rear valances. Torana XU1 vents, frenched indicators & Mk1 rear lights. 'Worked' Rover V8 with Monsoon ECU for EFI. GM4L60E, Lokar tiptronic & Quick4 controller. Vintage Air A/C. FC IFS. CCE 4 link rear. Salisbury with Quaife. Jaguar Storm.

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Re: differential questions
#14
Billy F. Avatar
Billy F. William Freund
Montrose PA, USA   USA
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1972 MG MGB
Curtis, here's one option. That's what I'm putting in:

http://www.amazon.com/gp/product/B00GFGVSY0/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1

It seems "pricey" but I just want to get everything wrapped up before winter.


Bill
72 MGB Roadster (summer driver)
2002 Subaru WRX Wagon (winter driver)

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Re: differential questions
#15
curtis7420 Avatar
curtis7420 Curtis Wright
University City, MO, USA   USA
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1975 MG MGB "The "B"
2003 Toyota Highlander 4WD
2010 Jeep Wrangler
thanks.

so i know how much oil to order, how much is required? sorry, being lazy. easier to ask than to look it up....

Edit:

looked it up on a different forum and they stated .85 liters. is this correct?



Edited 1 time(s). Last edit at 2014-10-20 10:16 AM by curtis7420.

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