Rear Pinion Seal
#2791996
07/02/20 07:18 PM
07/02/20 07:18 PM
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Joined: Feb 2015
Posts: 265 Philadelphia, PA
GTXKARL
OP
enthusiast
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OP
enthusiast
Joined: Feb 2015
Posts: 265
Philadelphia, PA
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Hello. What are the steps to replacing a rear pinion seal on a Dana rear of a 1970 Plymouth GTX? What kind if gear oil do I need to put in it? What gear oil for a 4 speed transmission? TY for any help!
“Working on cars teaches you patience... and every curse word imaginable.”
1970 Plymouth GTX -- A true gentleman's coupe, but a serious muscle machine.
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Re: Rear Pinion Seal
[Re: GTXKARL]
#2792106
07/02/20 11:08 PM
07/02/20 11:08 PM
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Joined: Aug 2003
Posts: 43,123 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,123
Bend,OR USA
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I use a big pipe wrench on the pinion yoke, tighten it up so it holds well and then use 1/2 inch or if you can a 3/4 inch breaker and socket to break the pinion nut loose. I use a brass drift, punch, to drive the pinion yoke off of the pinion shaft as far lube I like and use 75x90Wt non synthetic gear oil with a posi additive for the posi units On the 4 speed look for Pennzoil synchromesh gear oil and use it Summit and probably other hi Po warehouses stock and sell it if you can't find it locally like me
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Rear Pinion Seal
[Re: fastmark]
#2792253
07/03/20 10:33 AM
07/03/20 10:33 AM
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Joined: Aug 2011
Posts: 2,853 Pattison Texas
CSK
master
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master
Joined: Aug 2011
Posts: 2,853
Pattison Texas
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Here is how I break mine loose, it keeps from damaging the gears with an impac
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
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Re: Rear Pinion Seal
[Re: CSK]
#2792266
07/03/20 11:00 AM
07/03/20 11:00 AM
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Joined: May 2019
Posts: 6,225 nowhere
Sniper
master
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master
Joined: May 2019
Posts: 6,225
nowhere
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That's called working smarter, not harder. Here is how I break mine loose, it keeps from damaging the gears with an impact
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Re: Rear Pinion Seal
[Re: GTXKARL]
#2792287
07/03/20 11:35 AM
07/03/20 11:35 AM
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Joined: Jan 2003
Posts: 30,994 Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 30,994
Oregon
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Hello. What are the steps to replacing a rear pinion seal on a Dana rear of a 1970 Plymouth GTX? What kind if gear oil do I need to put in it? What gear oil for a 4 speed transmission? TY for any help! Mancini has the adapter for the yoke. You'll still need a 3/4 breaker bar to fit in the tool and then a big socket and a big breaker bar for the nut. Then you'll need a big torque wrench to tighten the nut back up. https://www.manciniracing.com/yoinreto.html
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Re: Rear Pinion Seal
[Re: Neil]
#2792342
07/03/20 01:59 PM
07/03/20 01:59 PM
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Joined: Mar 2011
Posts: 3,069 Michigan
A727Tflite
master
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master
Joined: Mar 2011
Posts: 3,069
Michigan
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FWIW I was told by a guy at a differential shop that occasionally pinion seal leaks can also be from oil migrating down the pinion gear, thru the splines, and out between the washer and or pinion nut. Once everything is wet with oil it's hard to tell where it's coming from exactly. True, and this also applies to the crank bolt and washer. Always use a dab of RTV on the yolk splines and most of the times on the damper slot for the key. I think we even issued an ASN in the early 80’s for the 318/360 damper leaks.
Last edited by Transman; 07/03/20 02:00 PM.
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