How many bolts are in a 4L80E transmission?

Only the TH350 and TH400 share the same number of bolts. So if you count the bolts and get 17 you can be sure that you have identified the 4L80E transmission. The 6L80E, which is the successor to the 4L80E, has 20 bolts.

How to identify a GM 4L80E longitudinal transmission?

With all GM longitudinal transmissions, it is far and away easiest to identify them by the amount of bolts on the transmission pan. Only the TH350 and TH400 share the same number of bolts. So if you count the bolts and get 17 you can be sure that you have identified the 4L80E transmission.

Is the Chevy 4L80 compatible with GM engines?

While the 4L80 is generally mechanically compatible with Chevrolet style GM engines, it does require a transmission controller. That controller may be the factory-integrated with the PCM as on 1991-1999 TBI & Gen II engines, with the 1999-2007 Gen III engines, or the 2007+ Gen IV engines.

How big is the deep pan on a 6L80E?

Didn’t catch that. Looking up a 6L80E, it seems to be similar. On other forums I’m finding 80-96 In/Lbs, which converts to 6.6 – 8 Ft/Lbs. I found this for OE spec and also B&M deep pan directions.

What kind of case does a GM 4L80E have?

Like the other GM automatics, the 4L80E featured a die-cast aluminum case. Unlike the later 4L60E transmission, the 4L80E did not feature a removable bellhousing, but an integrated bellhousing with only the Chevrolet 90 degree engine bolt pattern being available.