When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Hi!
I looked at a 4th gen LS1 Fbody with under 15k miles today. While overall the car looked super clean, it did appear the rear differential was wet and the harmonic balancer had some wobble. I’m no mechanic so not sure if I’m evaluating this correctly. I have attached a video of the pulley and a picture of the diff. Thanks for any second opinions! I don’t want to bother the owner with these unless truly a concern.
The rear differential leak is likely from the pinion seal. They don't normally leak at the cover gasket (assuming it's original, which this one likely is with such low miles), but the pinon seal leak is quite common. My 20k mile car has some weeping at the pinion seal; it's not something I worry about as it's too minor to ever cause the diff to be low on lube.
As for the balancer, I've never seen an LS1 that didn't have some amount of wobble (all of my four have has this). But I can't see your video, so I can't tell how serious the wobble is in your case.
Yeah, pinion seal is a known leaker on these cars. You can do a search and see how many people had problems with it even after being replaced. I just hit 50k miles on my car and have had to replace it twice already.
The rear differential leak is likely from the pinion seal. They don't normally leak at the cover gasket (assuming it's original, which this one likely is with such low miles), but the pinon seal leak is quite common. My 20k mile car has some weeping at the pinion seal; it's not something I worry about as it's too minor to ever cause the diff to be low on lube.
As for the balancer, I've never seen an LS1 that didn't have some amount of wobble (all of my four have has this). But I can't see your video, so I can't tell how serious the wobble is in your case.
I really appreciate the reply. This gives me some reassurance. I will at least ask about it. As for the balancer I tried to upload on Facebook Fbody Empire too. Maybe that works. If not, here is a
I really appreciate the reply. This gives me some reassurance. I will at least ask about it. As for the balancer I tried to upload on Facebook Fbody Empire too. Maybe that works. If not, here is a...
New video shows just fine. I wouldn't even really call that "wobble", looks totally normal for an LS1 to me. Engine bay looks a little dirty for a 15k mile car, but then most folks don't put proper effort into detailing unless they are showing the car so that's not a huge concern and could easily be cleaned up.
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.
7 Most Reliable High-Performance Engines GM Has Ever Built
Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.
Possible Purchase Evaluation Help 
