Automatic Transmission 2-Speed thru 10-Speed GM Autos | Converters | Shift Kits
Sponsored by:
Sponsored by:

2 Piece Sun Gear

Thread Tools
 
Search this Thread
 
Old Sep 3, 2025 | 08:41 AM
  #1  
claybreaker14424's Avatar
Thread Starter
Teching In
10 Year Member
 
Joined: Mar 2012
Posts: 8
Likes: 1
From: Western North Carolina
Default 2 Piece Sun Gear

My first transmission build is a 4L80e. This was a Marketplace purchase said to be in ok condition but the fluid smelled a bit burnt and lots of metal on the magnet in the pan so I tore it down. Direct Clutches were burned and broken. I'm reassembling now with the help of youtube and I noticed that I have a 2 piece Sun Gear Assembly with the lower gear being a larger diameter than the top gear, the lower gear must be inserted into the Output Planetary Gear Set from the output shaft end (back end) unlike the stock double gear that can be inserted from the top. So I have an aftermarket Output Carrier with custom Planetary Gears to mate up with a large diameter Lower Sun Gear. The Top Sun Gear appears to be stock in diameter. The Output Speed Sensor Ring is welded to the Output Carrier. I've searched Google to try to identify these parts so I at least I know what I have and to find documents, assembly instructions. I've haven't been able to find anything! The transmission is 2003 model, and I am beginning to think the aftermarket parts I have were discontinued. Anyone seen anything like this?
Lower sun gear and planetary gear.  I searched the numbers on this and nothing!
Lower sun gear and planetary gear. I searched the numbers on this and nothing!
Reply
Old Sep 3, 2025 | 11:01 AM
  #2  
FranksCustomTrans's Avatar
LS1Tech Sponsor
Shutterbug
Community Builder
Liked
Loved
 
Joined: Mar 2023
Posts: 1,821
Likes: 1,159
From: BERWICK PA
Default

You have a 2.75 RATIO GEAR set aftermarket like this https://www.summitracing.com/newsand...Mq3D4L99uREPPr and yes they are still made https://www.mytruckpoint.com/product...57-second-gear Though I am not sure if anyone offers individual pieces for them.
__________________
Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook



Reply
Old Sep 3, 2025 | 01:18 PM
  #3  
claybreaker14424's Avatar
Thread Starter
Teching In
10 Year Member
 
Joined: Mar 2012
Posts: 8
Likes: 1
From: Western North Carolina
Default

Thanks for that information!
Interesting...po said this came out of a hot rod but it seems more likely a drag racer. I might ditch them for stock parts. None of the parts are shown in stock and Summit doesn't have a listing for 4L80e parts. TCI only lists 91-97 case where as my case is a 2003.
Reply
Old Sep 3, 2025 | 01:52 PM
  #4  
FranksCustomTrans's Avatar
LS1Tech Sponsor
Shutterbug
Community Builder
Liked
Loved
 
Joined: Mar 2023
Posts: 1,821
Likes: 1,159
From: BERWICK PA
Default

Originally Posted by claybreaker14424
Thanks for that information!
Interesting...po said this came out of a hot rod but it seems more likely a drag racer. I might ditch them for stock parts. None of the parts are shown in stock and Summit doesn't have a listing for 4L80e parts. TCI only lists 91-97 case where as my case is a 2003.
if in good shape list them for sale bring good money

__________________
Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook



Reply




All times are GMT -5. The time now is 06:09 PM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
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.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
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.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
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...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
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.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE