700R4 Sun Shell 1982-2002, new and ready to install. Fits the 700R4. Ships fast from the USA.
Lost 2nd and 4th gear, or Reverse, in a 700R4 or 4L60E and found the sun shell splines rounded off or the shell cracked at the hub? This is a new, genuine GM reaction sun gear shell, part number 24228345, the same stock-design part GM supplies for the 700R4, 4L60 and 4L60E. It supersedes the earlier GM number 8683439 and also cross-references to A74624D. It is made of steel, made in the USA, and sold as the shell only.
The sun shell is the stamped steel drum that wraps over the rear of the gear train and links the reverse input drum to the reaction sun gear. Its tabs lock into the reverse input drum, and its hub is splined to the sun gear. When the 2-4 band clamps the reverse input drum in 2nd and 4th, the shell holds the sun gear stationary so the planetaries can produce those ratios. In Reverse, the reverse input clutch turns the drum and the shell drives the sun gear. Every bit of that torque passes through the hub splines, and that is where the stock shell gives up, especially behind a hot-rodded small block or in a heavy truck that tows.
Those same complaints can come from a burnt 2-4 band, a worn servo or a leaking reverse input clutch, so a stripped shell is usually confirmed on the bench. Our 700R4 won't shift into overdrive guide covers the band, servo and shell causes in order.
With the unit apart, lift the reverse input drum and the shell out together, then try to turn the sun gear inside the shell hub. Any rotational play, shiny rounded splines or a crack running from the hub into the shell body means replace it. Check that the shell tabs are straight and not hammered where they enter the drum. Our 700R4 common problems guide explains why sun shell failure keeps showing up on this transmission family.
This listing covers 1982-2002 700R4, 4L60 and 4L60E units. GM's parts catalog lists 24228345 across a long run of rear-drive models, including the Chevrolet C1500, Blazer, Astro, Camaro, Silverado and Tahoe, the GMC Sierra, Suburban and Yukon, the Buick Roadmaster and the Cadillac Brougham, Fleetwood and Escalade. Because the 700R4 changed in small ways over two decades, compare your old shell's tabs and hub against the photo, or send us your year and VIN before ordering. You can see the rest of our 700R4 parts here.
This is the stock-design shell. If the engine makes real power or the truck tows heavy, look at the Sonnax SmartShell heavy-duty kit instead; Sonnax built it specifically to stop the spline stripping and hub breakage the factory shell is known for.
| Fits | 700R4 1982-2002 |
| Part type | Sun Shell |
| Condition | New |
| Brand | GM |
| Reference | 24228345 |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Yes. GM 24228345 replaces the earlier 8683439. It also cross-references to A74624D.
No. It is the reaction sun gear shell only, as pictured. Reuse your sun gear if the splines are good, or replace it if they are worn.
This listing covers 1982-2002 700R4, 4L60 and 4L60E units. Compare your old shell to the photo or send us your year and VIN and we will confirm before you order.
For a stock engine and normal driving, the genuine GM shell restores the original design. For added power, towing or a unit that has already stripped a shell, the Sonnax SmartShell kit is the stronger choice.
Usually because the cause was left in place: a burnt band or worn servo, a damaged reverse input drum, excessive gear train end play or a reused worn sun gear. Fix those during the rebuild.
