The Garage and Dealer Maintenance Day!

[LibertyTC]

Everyone likes a few photos..First thing this am up on the lift...get skids off!
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With the Engine and transfer case skid off, I can now see the KJ !
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The rear diff had a few shavings in the mud....
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Should be good for a while now with new fluid in here.
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This YJ owner had bought rebuilt motors with not much luck:
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So after getting all the new GL5 75W-140 in diff's and ATF+4 in case, it was stop at Wally World for a new filter:
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And then it was into the dealer to let them flush the 6 year old Rad/coolant.
I took it for a good highway boogie after to make sure all was well and not overflowing. Will have to check the cold level in the am though..long day...
oh and this 64 GTO convertible was parked at the first garage this am what a beauty!
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[LibertyFever]

Thanks for posting the pics.

Yeah the skidplates can get in the way when you'll trying to do routine maintenance can't they? The last time I had my Libby into the dealership for routine diff service the mechanic was cursing at the seized bolts that held the engine skidplate on

I sometimes tow a trailer, maybe I should change my rear diff fluid to 90-140 weight. But then again winter is just around the corner and that fluid may be too thick in cold temps.

So the YJ owner has gone through a few engines Eh? Typically a stock 4.0L engine is pretty stout & hard to kill but if not maintained or rebuilt properly they can be a b***h I sure would like to have a heated garage to work in. I've rebuilt diffs & changed clutchs before on my YJ ia a frigid cold garage. Brrrr...

 

[Porkchop]

I love those pic

 

[LibertyTC]

A conversation took place yesterday regarding the 75w-140 thing yesterday as regular use.
The garage wants to recommend this grade for the diffs and he also is seeing good results on the gears and seals. The fuel reduction would be minimal as it heats up quick within a few minutes of regular driving. This will be my first coming winter with this grade, I don't expect it to be even noticeable.
A while back I called one of the top differential rebuilding shops here and asked him what his experience was with the Chrysler 8.25 diff and what he recommends for Lube. It was an interesting reply. He stated first off don't use synthetics, use regular GL5 and once again he stated that those rear ends get quite hot so 75-140 or 90-140 is best for overall use. Also it is acceptable to use the GL5 with the limited slip additive regardless.
He said that overall the rear diff requires changing the lube frequently and for those that do once a year or 12,000 miles are having good success and longevity.
A different story regarding those that use synthetics and anyone not changing the GL5 at recommended intervals.

 

[Banditsteve]

A conversation took place yesterday regarding the 75w-140 thing yesterday as regular use.
The garage wants to recommend this grade for the diffs and he also is seeing good results on the gears and seals. The fuel reduction would be minimal as it heats up quick within a few minutes of regular driving. This will be my first coming winter with this grade, I don't expect it to be even noticeable.
A while back I called one of the top differential rebuilding shops here and asked him what his experience was with the Chrysler 8.25 diff and what he recommends for Lube. It was an interesting reply. He stated first off don't use synthetics, use regular GL5 and once again he stated that those rear ends get quite hot so 75-140 or 90-140 is best for overall use. Also it is acceptable to use the GL5 with the limited slip additive regardless.
He said that overall the rear diff requires changing the lube frequently and for those that do once a year or 12,000 miles are having good success and longevity.
A different story regarding those that use synthetics and anyone not changing the GL5 at recommended intervals.

Nice posting TC - Did the bloke give any reasons for not using synthetic gear oil? I am hoping to change mine soon and would be interested in his thoughts. Cheers, Steve

 

[LibertyTC]

Yes he stated that the "synthetic seems to be causing greater wear, and if you do use synthetic it should be changed out in half the recommended interval" ie: 6000 miles instead of 12K for GL5.
"In other words the heat and meshing inside the gear case is causing the synthetic to break down sooner and not bonding well, not protecting as well as regular gear lube"
"I suppose slick is not good in the differentials"
Synthetic seems to work well in engines, but not in gear cases.
"If you do not mind spending the money and want something to bind very well to the gears try Lucas Products, but add the Chrysler friction modifier if your's is a Limited slip"
"You will find that the Lucas gear oil will run cooler (not discolor quickly) so it obviously is reducing the friction as promised.

85W-140: http://www.lucasoil.com/products/display_products.sd?iid=44&catid=12&loc=show&headTitle=%20-%20Lucas%20Heavy%20Duty%2085w-140%20Gear%20Oil
80W-90: http://www.lucasoil.com/products/di...headTitle= - Lucas Heavy Duty 80w-90 Gear Oil
I just used regular 75w-140 GL5 with the Chrysler friction modifier, but I change mine out every year or 10,000 miles or sooner.
Next time I am going to try the Lucas with modifier and extend the mileage to 12,000 and see if I can see a difference on the cleanliness of the Lucas oil.
One thing is for sure at 6,000 miles the dealer 75w-90 that was last in there, was dirty and I had a mud pie in the bottom, probably caused by my vehicle sitting in storage modes.

 

[Banditsteve]

Yes he stated that the "synthetic seems to be causing greater wear, and if you do use synthetic it should be changed out in half the recommended interval" ie: 6000 miles instead of 12K for GL5.
"In other words the heat and meshing inside the gear case is causing the synthetic to break down sooner and not bonding well, not protecting as well as regular gear lube"
"I suppose slick is not good in the differentials"
Synthetic seems to work well in engines, but not in gear cases.
"If you do not mind spending the money and want something to bind very well to the gears try Lucas Products, but add the Chrysler friction modifier if your's is a Limited slip"
"You will find that the Lucas gear oil will run cooler (not discolor quickly) so it obviously is reducing the friction as promised.

85W-140: http://www.lucasoil.com/products/display_products.sd?iid=44&catid=12&loc=show&headTitle=%20-%20Lucas%20Heavy%20Duty%2085w-140%20Gear%20Oil
80W-90: http://www.lucasoil.com/products/di...headTitle= - Lucas Heavy Duty 80w-90 Gear Oil
I just used regular 75w-140 GL5 with the Chrysler friction modifier, but I change mine out every year or 10,000 miles or sooner.
Next time I am going to try the Lucas with modifier and extend the mileage to 12,000 and see if I can see a difference on the cleanliness of the Lucas oil.
One thing is for sure at 6,000 miles the dealer 75w-90 that was last in there, was dirty and I had a mud pie in the bottom, probably caused by my vehicle sitting in storage modes.

Thanx LibertyTC - Food for thought............ kopkrab.gif

 

[Luke]

Good stuff Tim! Love to see that pride of ownership!

Peace,

 

[LibertyTC]

Thanks Luke,
It not only is pride of ownership but the need to switch up to the heavier Lube in Preparation for pulling the boat.
Since the clutches were replaced under warranty at 21k miles, I suppose the conversation in the forums regarding the Trash-lok rear diffs not lasting long, makes me want to keep this GL5 clean.
As in the photo below, you can see that the Lube is not all that clean, and these Trac-Lok clutch pack differentials will produce some clutch plate and metal shaving particulates.
I can see why folks like TJ do their diff maintenance at 6000 miles. Even the 8.25 would benefit from more frequent changes!
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[Bmxbika11]

lookin good man, those pics are sweettt!