The Texas Speed Crank Adapter Sleeve lets a torque converter built for a traditional small block Chevy engine bolt up to an LS or LT engine. The LS and LT crankshaft pilot is a different size than the earlier Chevy small block, so a converter from a non-LS application will not center correctly on the crank without this sleeve. It is a common need on LS swaps into older GM cars and trucks that keep their original automatic.
Texas Speed lists the sleeve for converters from the Powerglide, TH350, TH400, 2004R, 700R4, 4L60, 4L60E and 4L80E transmissions that were originally behind a non-LS engine. Texas Speed notes one exception: if the engine being installed is a 6.0L from a 1999 or 2000 model, the sleeve is not required. It pairs with the Texas Speed High Integrity Quick Rev flexplates when an older small block style converter is used.
Specifications
- Function: Adapts a small block Chevy style torque converter to an LS or LT crankshaft and flexplate
- Converter applications: Powerglide, TH350, TH400, 2004R, 700R4, 4L60, 4L60E and 4L80E converters from non-LS engines
- Engine side: GM LS and LT
- Exception noted by Texas Speed: Not required when installing a 6.0L engine from a 1999 or 2000 model
- Quantity: One sleeve
- Part number: TSP-00346 (Texas Speed 1800346)
FAQ
What does the Texas Speed crank adapter sleeve do?
It adapts a torque converter made for a traditional small block Chevy engine so it centers properly on an LS or LT crankshaft and flexplate, which is needed when an older GM automatic transmission and converter are reused behind a swapped-in LS or LT engine.
Which transmissions does the adapter sleeve work with?
Texas Speed lists it for converters from Powerglide, TH350, TH400, 2004R, 700R4, 4L60, 4L60E and 4L80E transmissions that were originally mated to a non-LS engine.
Do I need this sleeve for every LS swap?
Only when the torque converter comes from a non-LS application. Texas Speed also notes that if the engine being installed is a 6.0L from a 1999 or 2000 model, the sleeve is not required.
Does this sleeve work with Texas Speed flexplates?
Yes. Texas Speed references this adapter sleeve on its High Integrity Quick Rev flexplate listings as the part needed when an older small block Chevy style converter is used with an LS flexplate.
Is the crank adapter sleeve vehicle specific?
No. It is an engine and converter interface part, so it applies to any LS or LT engine paired with one of the listed small block style converters regardless of the chassis the swap is going into.
