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Discussion Starter · #1 ·
Hey when the weathers gets a little better out I'm going change all the fluids in my wrangler. Its a 04 unlimited auto with 90k on it and i highly doubt anything has been changed. I wanna use Royal Purple for the trans rear and front dif. My question is tho could i use RP Max ATF in the trans? If so how many quarts of the trans take. front and rear diff and trans case take?
 

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Not sure about how much the trans holds. You will need to remove the skid plate to do them. Fill the axles to the plug on the diff cover. Probably close to 2 qt per axle.
 

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mannyssj13 said:
Also how easy/hard is it to change the fluid in the trans and changing the trans filter?
I got a 2000 tj and it takes 3qts of tranny fluid. But it's not an unlimited it's also manual. The drain plug is just before the transfer case guard.
 

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Discussion Starter · #5 ·
Lithomaster86 said:
I got a 2000 tj and it takes 3qts of tranny fluid. But it's not an unlimited it's also manual. The drain plug is just before the transfer case guard.
What do I do drain the fluid and drop the trans filter to replace it? And refill from the dip stick?
 

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Discussion Starter · #6 ·
Mortalis5509 said:
Not sure about how much the trans holds. You will need to remove the skid plate to do them. Fill the axles to the plug on the diff cover. Probably close to 2 qt per axle.
Well I brought the ARB dif covers that has a drain plug and fill thing on top with a dip stick. When I go to change the oil I was going to put the dif cover on. So just to b on the safe side I should buy like 4 quarts for the Axels all together.
 

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front and rear diff and trans case take?
1. front diff takes 80w90.
2. rear diff takes 80w90 and 4oz of friction modifier.
3. your 42RLE transmission REQUIRES Mopar approved ATF+4. Use either Valvoline ATF+4 or Mopar ATF+4. Failure to use the proper ATF+4 WILL destroy your trans - it needs that specific fluid. You won't be able to change all the fluid unless you go to a shop with a flush system, the torque converter contains most of the fluid. Also make sure to change the filter when you drop the pan - only use Mopar filters. the 42RLE doesn't like aftermarket filters...will shift even worse than it does now. Might also be a good idea to purchase the new updated tranny pan from the dealer.
4. t-case spec is also ATF+4, but it can also run on 10w30 motor oil.
 

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Discussion Starter · #9 ·
UnlimitedLJ04 said:
1. front diff takes 80w90.
2. rear diff takes 80w90 and 4oz of friction modifier.
3. your 42RLE transmission REQUIRES Mopar approved ATF+4. Use either Valvoline ATF+4 or Mopar ATF+4. Failure to use the proper ATF+4 WILL destroy your trans - it needs that specific fluid. You won't be able to change all the fluid unless you go to a shop with a flush system, the torque converter contains most of the fluid. Also make sure to change the filter when you drop the pan - only use Mopar filters. the 42RLE doesn't like aftermarket filters...will shift even worse than it does now. Might also be a good idea to purchase the new updated tranny pan from the dealer.
4. t-case spec is also ATF+4, but it can also run on 10w30 motor oil.
I'll just go to a shop and get the trans flush just buy the parts myself and have them do the work i know someone who owns a shop so yea. Everything else I can do on my own. As for the tranny pan why would I need a new one? The one I have is in good shape still black no rush and projected by the skid plate. I don't have tons of money just to buy a new pan I'm sure they Aren't cheap! But thanks for the info helped a lot! But also isn't Royal Purple like top of the line more or less why would it mess up the trans? Isn't it a better lube then OEM?
 

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I'll just go to a shop and get the trans flush just buy the parts myself and have them do the work i know someone who owns a shop so yea. Everything else I can do on my own. As for the tranny pan why would I need a new one? The one I have is in good shape still black no rush and projected by the skid plate. I don't have tons of money just to buy a new pan I'm sure they Aren't cheap! But thanks for the info helped a lot! But also isn't Royal Purple like top of the line more or less why would it mess up the trans? Isn't it a better lube then OEM?
the 42RLE skid plate is nothing more than shovel to collect mud and junk. the new pan is a TCM/updated pan...supposed to address the well know 42RLE cavitation issue & allow more fluid capacity. It looks damn near the same to me though, and the magnet is much smaller. All told I think its between $15-20 from the dealership...new magnet and new pan. That too expensive for you?

I don't know jack squat about Royal Purple, but I do know they're not on the Mopar ATF+4 list, and the 42RLE REQUIRES Mopar approved ATF+4. It needs this fluid for the clutches to operate properly. Mine died at 50k miles, which isn't uncommon for this 42RLE. They can have major overheating issues, and they shift like crap, all thanks to Jeep. The best thing you can do is install a tranny cooler - forward of the radiator & condensor only, and change the fluid & filters every 30k with Mopar parts.
 

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Discussion Starter · #12 ·
the 42RLE skid plate is nothing more than shovel to collect mud and junk. the new pan is a TCM/updated pan...supposed to address the well know 42RLE cavitation issue & allow more fluid capacity. It looks damn near the same to me though, and the magnet is much smaller. All told I think its between $15-20 from the dealership...new magnet and new pan. That too expensive for you?

I don't know jack squat about Royal Purple, but I do know they're not on the Mopar ATF+4 list, and the 42RLE REQUIRES Mopar approved ATF+4. It needs this fluid for the clutches to operate properly. Mine died at 50k miles, which isn't uncommon for this 42RLE. They can have major overheating issues, and they shift like crap, all thanks to Jeep. The best thing you can do is install a tranny cooler - forward of the radiator & condensor only, and change the fluid & filters every 30k with Mopar parts.
Didn't know the pan was the cheap sometimes pans are a little higher.
 

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I'll just go to a shop and get the trans flush just buy the parts myself and have them do the work i know someone who owns a shop so yea. Everything else I can do on my own. As for the tranny pan why would I need a new one? The one I have is in good shape still black no rush and projected by the skid plate. I don't have tons of money just to buy a new pan I'm sure they Aren't cheap! But thanks for the info helped a lot! But also isn't Royal Purple like top of the line more or less why would it mess up the trans? Isn't it a better lube then OEM?
That's your best bet if it has never been changed. 50% of the fluid stays in the torque converter when you drain it. The only way to get it out is to flush it.
 
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