Help to identify leaks.

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AtrueCroft

AtrueCroft

Joined
Aug 19, 2025
Threads
5
Messages
39
Location
Georgia
Earlier today, I lifted my 80 series up to look at the chassis and I noticed a few leaks. Can you guys can help me identify these leaks and help identify the parts I’ll need to fix, I’ll appreciate it. @White Stripe @Fj80oregon
when I push on the break, it feels very sluggish and squishy, when I looked at the reservoir, its low. I assume there is a leak. When I looked underneath the alternator, there was a few hoses leaking.
There’s a lot of oil leaking from my transfer case, but can’t quite understand where it’s coming from. I also keep seeing oil on the bottom of my transmission and I’m not sure where it’s coming from.

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For your second picture you'll want to look up 96711-24030
It's like a 10 minute fix, maybe 12 after you pick off all the orange boogers someone tried to patch it with.

The rest will be easier to identify if you clean up some, oil typically drips down
 
jonheld said:
What's going on with the speed sensor on the rear output housing of the transfer case??
It looks like someone used RTV as opposed to replacing the $2 O ring.
96711-24030
Click to expand...
It looks like that’s exactly what they did, when I bought this 80 series a while back ago all the parts that I’ve had to replaced were non-OEM or “cheapest way out”
 
jonheld said:
What's going on with the speed sensor on the rear output housing of the transfer case??
It looks like someone used RTV as opposed to replacing the $2 O ring.
96711-24030
Click to expand...
All I know is it’s leaking pretty bad oil
 
I would say replace the O-ring like Jon said and then clean the front and underside of the engine. You can then check for where the leaks are coming from once it is a clean. If you have trouble telling, there is a dye that you can put in the oil that will help show the path.

I know you said you did all the common culprits that BH listed out but one of them is apparently not sealed and leaking again. There are specific places these engines love to leak and yes they tend to do this often. I do not think I have purchased one yet that had zero leaks.

Now, some of what you describe may not be oil but PS fluid. Also, it may be an optical illusion or just my bad eyes but are all the bolts in the pan? Some look to be missing.
 
Brindleboxer said:
I would say replace the O-ring like Jon said and then clean the front and underside of the engine. You can then check for where the leaks are coming from once it is a clean. If you have trouble telling, there is a dye that you can put in the oil that will help show the path.

I know you said you did all the common culprits that BH listed out but one of them is apparently not sealed and leaking again. There are specific places these engines love to leak and yes they tend to do this often. I do not think I have purchased one yet that had zero leaks.

Now, some of what you describe may not be oil but PS fluid. Also, it may be an optical illusion or just my bad eyes but are all the bolts in the pan? Some look to be missing.
Click to expand...
Yes all the bolts are on. it’s an optical illusion. There is oil under them. I am thinking maybe the rear main seal needs to be replaced. I think my power steering pressure hose needs replacing. It’s under the alternator.
 
ACIS appears to be working correctly.
 
AtrueCroft said:
Yes all the bolts are on. it’s an optical illusion. There is oil under them. I am thinking maybe the rear main seal needs to be replaced. I think my power steering pressure hose needs replacing. It’s under the alternator.
Click to expand...
All you're doing is speculating at this point. Fluids will blow around and collect at low points.
Clean things up, find the leaks, effect repairs.
 
The "sleeve sub-assembly" or speedometer shaft housing that the speed sensor attaches to on the side of the transfer case also has an internal shaft oil seal (90310-09001) that can be replaced at the same time as the O-ring (96711-24030) for the shaft housing.

FWIW
 
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