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auto trans fluid in differential
Posted by: 66corvair500 ()
Date: August 31, 2018 05:49AM

Another Question for you corvair enthusiasts.

Trying to bring this 1966 corvair back to life after being stored in a barn since 1985, I pulled the differential plug to check the fluid and in was full of ATF fluid? (being red and light weight I'm thinking)

Anyone know what would cause this and is this something I could repair myself or is this a problem for the pro's??

P.S. the advice on my "moving timing mark" was spot on, bad Harmonic balancer, (Thanks on that tip)

Thanks Randy



Edited 1 time(s). Last edit at 08/31/2018 02:04PM by MattNall.

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Re: auto trans fluid in differential
Posted by: jjohnsonjo ()
Date: August 31, 2018 05:54AM

Red line synthetic gear oil is red, just say'n

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa

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Re: auto trans fluid in differential
Posted by: Murphy ()
Date: August 31, 2018 06:17AM

Is there any ATF in the transmission?

Once upon a time I had a seal go bad that allowed the ATF to drain into the Differential.

Going to pull the drivetrain to get at it.

65 Monza Coupe
61 500 Coupe (under Construction) Getting REALclose.

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Re: auto trans fluid in differential
Posted by: Layton Curtis ()
Date: August 31, 2018 06:20AM

The seal is shot in the snout. You will have to remove the diff and then ring and pinion and replace the seal.

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Re: auto trans fluid in differential
Posted by: 66corvair500 ()
Date: August 31, 2018 06:21AM

Murphy, yes but it low and I just topped it off, so I'm guessing there is a seal somewhere shot and needs replacement. Just not sure if I would need all kinds of special tools to do the job?

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Re: auto trans fluid in differential
Posted by: 66corvair500 ()
Date: August 31, 2018 06:23AM

Layton, thanks that's what I was thinking too, just not sure how big of a job it is to R/R the differential?

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Re: auto trans fluid in differential
Posted by: MattNall ()
Date: August 31, 2018 07:10AM

Most likely ATF... but suck it all out and refill with GL-5 fluid... then wait until you drive it..since you are still just "reviving it".





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: auto trans fluid in differential
Posted by: Murphy ()
Date: August 31, 2018 07:11AM

66corvar500,

Davemotohead has some great videos on youtube on whats involved in doing this job.

Watch that and you can decide if you want to do it yourself.

65 Monza Coupe
61 500 Coupe (under Construction) Getting REALclose.

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Re: auto trans fluid in differential
Posted by: joelsplace ()
Date: August 31, 2018 07:26AM

The differential has to be dissassembled to replace the pinion seals. There are 2 and the adjuster has an o-ring. Big job and you have to know how to setup the ring and pinion to reassemble.

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Re: auto trans fluid in differential
Posted by: Marco_a_p ()
Date: August 31, 2018 08:59AM

Pinion seals as stated. Will have to drop the unipack and dissassemble diff.
Inspect ring and pinion and bearings.
If there has been any millage on that diff the ring and pinion gears are very likely damaged.

Marco
Sun Valley Ca 91352

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Re: auto trans fluid in differential
Posted by: 66corvair500 ()
Date: August 31, 2018 10:01AM

Thanks Joel, sounds like it's a little more then I want to tackle.

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Re: auto trans fluid in differential
Posted by: MattNall ()
Date: August 31, 2018 11:32AM

Randy... Michigan... lots of parts in Michigan...but do what I said and drive it..





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: auto trans fluid in differential
Posted by: davemotohead ()
Date: August 31, 2018 11:51AM

Most likely the ATF in the diff is the reason it was parked in a barn in 1985, Not sure red line red gear old was around in 1985? Regardless like Marco said if it was driven any distance the ring and pinion gears are most likely shot, your only options are to either rebuild the entire diff, that includes all the seals and at least the pinion bearings and race's, you need to inspect things once apart to know for sure if the bearings are any good? Or buy a rebuilt diff from someone, ALSO, any power glide transmission that has been sitting since 1985 will most likely have cracked seals from being dried out from lack of use, and will need to be rebuilt also, IMO most old PG's need a rebuild at this point, there are a lot of rubber seals and O-Rings, when they dry out and crack, you have no more internal pressure and it wont work.





Email me at: Dave Motohead

1960 4dr sedan caveman car
1961 Rampside (Chetside)
1962 Rampside (Barnside)
1962 Short Rampside (Shortside)
1962 Monza 700 Wagon
1963 Monza 900 coup (General Nader)

-----------------------------------
Rust Free Lancaster Ca

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Re: auto trans fluid in differential
Posted by: steve c goodman ()
Date: August 31, 2018 12:24PM

If you are in Michigan remember Ken Hand is there. vairmech here or vairmech@aol.com

best wishes, Steve
Rear Engine Spec. Inc. Golden, Colo.

1962 spyder 3.0L turbo---1965 Crown V8
1967 monza 110/4---1968 monza 110/4
1971 amante gt 110/4
CORSA/RMC/PPCC

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Re: auto trans fluid in differential
Posted by: joelsplace ()
Date: August 31, 2018 12:59PM

Bel-Ray gear oil was red in the early 80s for sure and I think Red Line was around then too but I don't remember for sure.

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Re: auto trans fluid in differential
Posted by: Timothy Shortle ()
Date: August 31, 2018 04:47PM

I agree with everything said. If driven with ATF, the hypoid gears (ring and pinion) are toast, probably the reason the car was parked, big job (even for a pro), etc. etc. If it was me I would find a GOOD USED diff. (Ken Hand is a good source in Southern Michigan).

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Re: auto trans fluid in differential
Posted by: JimBrandberg ()
Date: September 01, 2018 06:38AM

There's two seals that keep ATF out of the differential. The "easier" one is between the differential and Powerglide. The more difficult one requires disassembling the differential. I've had luck with just replacing the "easier" one twice now in the last few years but it is a bit of a crapshoot. I pulled the powertrain, set it on blocks and removed the Powerglide from the differential.

Jim Brandberg
Isanti, MN
CorvairRepair.com.

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Re: auto trans fluid in differential
Posted by: Wagon Master ()
Date: September 01, 2018 09:52AM

Castrol JT-7 was red from 1971-199?

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Re: auto trans fluid in differential
Posted by: Layton Curtis ()
Date: September 01, 2018 10:39AM

I wouldn't give up on that diff until I looked it over. I was into some Chrysler diffs in the 70's and they used ATF for lubricant and they didn't fail.

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Re: auto trans fluid in differential
Posted by: JimBrandberg ()
Date: September 01, 2018 01:32PM

None of the differentials I've dealt with that had ATF in them were shot. It's certainly possible but it's not a given. It's probably not the best thing for them but they're pretty robust and the wrong oil is probably better than no oil.

Another thing to consider is that when ATF gets into a differential the oil level in the differential rises, it's not like a 2-way street where gear oil is getting into the transmission. I would do like what I think Matt is suggesting, suck all the oil out of the differential, put in some new 80/90 GL-5 and then drive it so see what happens. If the ATF level goes down and differential oil is higher than the plug, then you know for sure you've got a problem. Perhaps you've already done that...

Too bad it isn't like a 62 differential with a drain plug.

Jim Brandberg
Isanti, MN
CorvairRepair.com

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