LS1/LS2/LS6/5.3/6.0 to TH350/700R4/4L60 Adapter Flexplate
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Product Details
Works on all standard 6-bolt crankshaft 1997-2007 Gen III LS engines Allows direct bolt-on fitment of previous generation automatic transmissions Supports Non-LS 4L60 as well as popular older 3- and 4-speed automatics No modifications required to LS engine block or crankshaft New LS flexplate features dual GM torque converter patterns of 10.75” and 11.10” Flexplate is gold zinc plated, 4mm thick, and carries a SFI 29.1 certification Not compatible with 8-bolt crankshaft Gen IV LS engines Not for use with early Gen III LS 6.0L (1999-2000) due to extended crankshaft flange A Flexplate That Allows Direct Fitment of Older GM Automatics to Your Gen III LS Engine Unlike some engine swaps that require modifications to the transmission bellhousing, or even requiring the bellhousing to be cut off and a different one added, GM wisely retained the Gen 1 small block bellhousing bolt pattern for the Gen III (and Gen IV) LS V8. So, most any non-LS GM automatic, including the TH350, 700-R4, or even the venerable Powerglide will bolt directly to the engine block with no modifications, though it does so with one less bellhousing bolt. The swap issue lies inside the bellhousing with the flexplate and torque converter relationship and how they attach. To address this spacing issue in the most cost effective way possible we offer a custom LS flexplate with the LS 6-bolt crankshaft pattern and 168 tooth count. The center section is 4mm thick, which is .035-inch thicker than a stock LS flexplate and features a forged 1-piece ring gear to meet SFI 29.1 specifications. The LS flexplate is drilled for both early SBC torque converter bolt patterns (10.75\" which fits Powerglide, TH350, 200-4R, 700-R4, 4L60) and later LS converter pattern (11.06” 4L60E with LS engine). We even made sure our LS flexplate allows the use of the stock LS starter, which is one less swap p... view more