onebigburb
Registered Member
Okay here's my question. Np231 an 241 are basicly the same. 231 use's gear oil 241 use's trans. Why? Could you use gear oil instead?
CK5
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np241 gear oil or trans fluid
- Thread starter onebigburb
- Start date
NP241 should use ATF.
The NP231 I had in my S10 used ATF also.
Not sure where it says to use gear oil in a 231? Although I have heard of people using gear oil in 208/241s without issues. My thought is that if your trans uses ATF then use ATF in the t-case. Just in case a seal leaks there is no fluid cross contamination.
Just to make things more confusing, the 205 t-cases mostly use gear oil. But I have heard of applications that say to use ATF.
So, all in all, just pee in the t-case. I bet it'll be just fine.
The NP231 I had in my S10 used ATF also.
Not sure where it says to use gear oil in a 231? Although I have heard of people using gear oil in 208/241s without issues. My thought is that if your trans uses ATF then use ATF in the t-case. Just in case a seal leaks there is no fluid cross contamination.
Just to make things more confusing, the 205 t-cases mostly use gear oil. But I have heard of applications that say to use ATF.
So, all in all, just pee in the t-case. I bet it'll be just fine.
onebigburb
Registered Member
Lol. I thought you were supose to do that in the heater vent?
See I find that interesting cause my s-10 has gear oil (np231)
So any one got any info on wat t-case use's what?
See I find that interesting cause my s-10 has gear oil (np231)
So any one got any info on wat t-case use's what?
onebigburb
Registered Member
At the same time if a seal blows fluid would just run out mating surface there is no seal to keep it the adapter plate.
The point was that if the input shaft seal on the t-case fails, you wont have gear oil from the t-case leaking into the auto trans fluid. Automatic transmissions don't like gear oil. So, if you have an auto trans, use the matching ATF in the t-case.
And inside the t-case adapter area is a "wet" space. It's open to the back of the trans. The only thing stopping gear oil in a t-case from entering an auto trans is the t-case input shaft seal. On that same note, if you have a leak between the adapter and t-case or adapter and trans, you need to remove and reseal those areas or you are just losing trans fluid.
Also, if you want to discuss "correct" t-case fluids, the general rule of thumb is...
for chain driven t-cases (231/208/241) you use ATF
for gear driven t-cases (205) you would use gear oil
But, as I stated before, that is not always what is required. Read the owners manual for best results.
And inside the t-case adapter area is a "wet" space. It's open to the back of the trans. The only thing stopping gear oil in a t-case from entering an auto trans is the t-case input shaft seal. On that same note, if you have a leak between the adapter and t-case or adapter and trans, you need to remove and reseal those areas or you are just losing trans fluid.
Also, if you want to discuss "correct" t-case fluids, the general rule of thumb is...
for chain driven t-cases (231/208/241) you use ATF
for gear driven t-cases (205) you would use gear oil
But, as I stated before, that is not always what is required. Read the owners manual for best results.
I've never seen a 231 or 241 that was specified to use gear oil, and don't see how the oil pump in these could even handle gear lube.
Does your S-10 just happen to have gear lube in the t-case, or is that what the owner's manual calls for?
Does your S-10 just happen to have gear lube in the t-case, or is that what the owner's manual calls for?
