4L60e Transmission Interchange Guide

4L60e Transmission Interchange Guide

4L60e Transmission Interchange Guide – Discussing start this swap experience with some basics. The traditional Gen I small- and big-block Chevy crankshaft arrangement extends the crankshaft flange 0. 400 in . beyond the bellhousing face. The LS family of engines (with one different that we will detail) places the crank flange flush with the bellhousing mounting surface. So, when bolting an older transmitting just like a Powerglide, TH350, TH400, 2004-R, or early 700-R4 to the LS engine, there will be a zero. 400-inch gap between flexplate and the torque conversion software. Chevrolet’s simple solution for this was a material spacer located between the crankshaft flange and a flat LS flexplate. This kind of became a Chevrolet part number for the development use of a 4L80E computerized behind LS motors in selected heavy-duty applications. Because the 4L80E is essentially a TH400 with an overdrive, its bellhousing bolt pattern and revolt converter placement are the same to a TH400. The 4L80E, however, does use a much larger revolt converter and mounting routine, as we’ll see.

This kind of creates essentially two different LS flexplates. The most common design combined with flush crankshaft flanges is concave exactly 0. 4 hundred inch. The 1999-2000 pickup truck extended crank flange machines used a flat flexplate, but because the turn flange is extended zero. 400 inch, this toned design places the basic ring gear in exactly the same position as the flush flange, curvy design. To accommodate a mature transmission where the crankshaft flange is extended, The 2012 chevrolet create a 0. 400-inch metal spacer to be used with the most frequent LS machines by using a flush crankshaft. This kind of spacer can be found between the crank flange and the flexplate and is employed in conjunction with a level LS flexplate. This joindre also requires longer products. We’ve listed both the GM and ARP products in our parts list.

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Making use of the flat LS flexplate requires minor elongation of 3 converter mounting holes, since an LS converter utilizes a wider bolt pattern than either of the traditional Powerglide/TH350 or TH400 editions. We’ve listed all the converter patterns in a separate chart. Elongating the LS flexplate converter gaps inboard is a small effort that can be accomplished with a rat-tail file or a high speed die grinder, but the best to attempt before you torque it in place on the engine.