Ideal for 4×4, heavy-duty and commercial use in GM 4L60 and 4L60/65/70-E units, Sonnax drop-in extra-wide intermediate band (p/n 77700-01K) is the ONLY wide band available that features OEM style high-energy material, according to the company. It’s 15% wider than the OE band, provides 15% more holding capacity, and features a 60% thicker case anchor – which reduces the chance of band failure under severe conditions. No drum modifications required!