Replacement fluids for a 71 - JeepForum.com
 
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post #1 of 7 Old 06-03-2020, 07:17 AM Thread Starter
70-71
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Question Replacement fluids for a 71

What has worked well for you all in your Jeeps. What should I stay away from? My Jeep v6 cj5 is still original at this point.
Thanks,
Brian

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post #2 of 7 Old 06-03-2020, 11:34 AM
Fourtrail
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You want to use a GL-4 oil in the trans to protect the syncro's. GL-5 is fine for the t-case and diffs. Be sure to add friction modifier if you have a factory power-lock in either the front or rear axle. Most have gone to using 15W-40 'diesel' engine oil, supposed to be better for flat tappet cams in the older motors. Non-ethenol fuel if you can find it locally and if your Jeep will sit for longer periods between usage. Good old green 50-50 premix in the radiator.

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post #3 of 7 Old 06-03-2020, 12:43 PM
oldschool74cj5
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hello

i use valvoline vr1 racing oil which is nothing more the the old i believe SG specification oil from the 80's or i know that lucas makes a hotrod oil that is pretty much the same. the older specification of oil has alot more DZZP in it. it is the zinc chemical that lubricates the flat tappet camshafts. i know some who just but a regular dino oil and add the DZZP to it. i just like having it all ready mixed in. unfortunately the new diesel oil is also getting rid of the zinc slowly. it ruins cats after about 100k or more.
like fourtrail said you want to use a gl4 gear oil in the transmission. the gl5 isnt good for your synchros because they are made of brass or a bronze. the transfercase and axle you can use regular 80/90 gl5 gear oil.

i run regular gasoline but when i go for work for a month or so i do put some gas additive that boats use for the newer ethanol gas in my gas. i havent had a problem in the couple years of doing that. alot of the time i will also pinch my fuel line and run till she quits. that runs the carb dry.

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post #4 of 7 Old 06-03-2020, 08:58 PM
jeepdaddy2000
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Don't forget there is brass in the t case as well (the trans and t case swap fluid). Personally, I have used good 'ole 90WT hypoid oil in all my boxes since the beginning of time (blasphemy!) with no issues. Not recommending it, just sharing my experiences.



Don't forget the closed knuckles on the front axle. You are probably going to have to remove the seals and felt wipers and use emery cloth on the seal surfaces. Reassemble and fill with a combo of 90WT and grease. Drive it around a bit to mix the "slurry".


Use the heaviest grease you can find on the clutch/brake pedals and steering bellcrank. A light axle grease in the Ross steering box.


I like Rotella 15/40 in the engine, though, any quality 10/40 auto or 15/40 diesel oil will work fine. I dislike thinner oils as older engines don't carry the tight tolerances you see in newer cars.


Dot 3 in the master cylinder.


LIGHT grease in the hubs and wiper arm bushings.


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post #5 of 7 Old 06-04-2020, 05:24 PM Thread Starter
70-71
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Thanks for the replies info information. Iím planning on working on it soon.
I have found the 53-71 service manual on oljeep.com through this forum. Any other suggestions where I might finding a 71 manual?
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post #6 of 7 Old 06-04-2020, 05:26 PM Thread Starter
70-71
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Will do jeepdaddy2000!
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post #7 of 7 Old 06-05-2020, 02:18 AM
BagusJeep
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Pre mix the grease and oil before injecting into the knuckles and Ross box and it may stay together but there is a tendency for it t seperate and the oil leak out. There used to be a special fluid grease available, you may find something at a tractor supply or there is a Landrover one shot grease, all you need is for it to be semi liquid and settle to the bottom, to be picked up next time by the moving parts and heavy enough that it does not ooze part the seals.

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