A – Yes, but there are variants that will not be compatible. The 1998-2001 Firebirds with Gen III LS1’s with automatic transmissions came with a 4L65E transmission not a 4L60! However, “4L60E” is cast into the case of the 4L65E making it confusing to figure out what transmission you have. The only noticeable external difference is the bellhousing. The 4L65E uses a 7-bolt bellhousing, and the 4L60E uses a 6-bolt bellhousing. The 4L65E bellhousing is also ~1in longer than the 4L60E bellhousing causing fitment issues with our transmission crossmember.GM accounted for this extra bellhousing length by shortening the tail housing to use the same length drive shaft on all the F-body cars. Please contact our sales team if you are unsure of which transmission you have so we can be sure to get you the correct driveshaft.