When the extension housing bushing on a TH400 or 3L80 unit wears out, output shaft movement increases and seal life drops sharply, so replacing this single component at the right time is a straightforward way to address both problems before they compound. This listing is for one extension bushing sized for TH400 and 3L80 automatic transmission units built from 1965 to present, nothing more and nothing less.
TH400 and 3L80 are two designations for the same basic unit, and this bushing covers both. The part is dimensioned specifically for the extension housing location in this transmission family, which means it fits into the bore without modification and supports the output shaft the way the stock piece did when the unit was new.
This is not a kit. There are no seals, no gaskets, no thrust washers, and no additional bushings in the box. If your job calls for a broader set of components, check the rest of the catalog before placing this order. What arrives is one bushing, packed individually at the REMCO facility in San Antonio, where staff have been assembling transmission parts since 1991. The box includes a parts list that confirms exactly what is inside.
At 1 lb, the piece ships compact. The technician receiving it should confirm the transmission code before installation. TH400 and 3L80 units share this application, but other automatics from overlapping years use different bushing dimensions, so a positive ID on the unit saves a return trip.
- Restores proper shaft alignment in the extension housing of TH400 and 3L80 units, preventing excessive wear and output shaft play.
- This listing covers one bushing only. It does not include seals, gaskets, thrust washers, or any other components. Verify what your rebuild requires before ordering.
- The TH400 extension bushing is a single, precisely sized piece matched to the dimensional specs of this unit, not a generic substitute pulled from a mixed assortment.
- Contents: 1 extension bushing. Item weight: 1 lb. Each piece is checked at the time of packing and the box includes a parts list confirming its contents.
- Before ordering, confirm your transmission code is TH400 or 3L80 and that the unit falls within the 1965-to-present production range. One bushing is included.
What's in the box
- 1 x Bushing, TH400 Extension
Compatible vehicles
- Fits K2500 Panel Delivery 3/4 Ton 4WD [67].
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