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Old 04-07-2011, 11:33 AM   #1
TruckTech
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Default 4L60E or 4L80E, How do you know?

Ordering some parts online for my pickup, '93 Chevy K1500. Trying to order a trans filter kit and I dont know If I have a 4L60E or a 4L80E. What should I be looking for to identify it? Pickup has a 5.7 and 14 bolt rear end with locker and 3.73 gears. 6,600 lb GVWR. Also how can I identify a standard or shallow pan?
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Old 04-07-2011, 11:50 AM   #2
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Default Re: 4L60E or 4L80E, How do you know?

http://www.maliburacing.com/auto_tranny_id.htm

4L60E pan is almost square shaped, 4L80E is longer.

I'm guessing you have a Z71 with a 14 bolt semi-floater (9.5"). As far as I know none of the half tons got the 4L80E, except for the rare diesel half tons.
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Old 04-07-2011, 11:53 AM   #3
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Default Re: 4L60E or 4L80E, How do you know?

Look at the pan, count the number of bolts:

4L60e is 16 bolts, pan is very square.
4L80e is 17 bolts, pan is more rectangular.

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Old 04-07-2011, 11:55 AM   #4
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Default Re: 4L60E or 4L80E, How do you know?

A 4l60e will have 16 bolts for the pan and the 4l80e will have 17. As adam said the 4l60 will be square and the 4l80e will be more curved in the front and long. Didnt see any 1/2 tons with 4l80e's till they came out with the 1/2 ton HD in early to mid 2000's.
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Old 04-07-2011, 12:08 PM   #5
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Default Re: 4L60E or 4L80E, How do you know?

Quote:
Originally Posted by adam728 View Post
http://www.maliburacing.com/auto_tranny_id.htm

4L60E pan is almost square shaped, 4L80E is longer.

I'm guessing you have a Z71 with a 14 bolt semi-floater (9.5"). As far as I know none of the half tons got the 4L80E, except for the rare diesel half tons.
Wow, thanks for being so quick guys. Looks like I do indeed have a 4L60E. I had forgotten about those diesel half tons. I also have 3 options for shallow, standard, and deep pans. Any info on those?
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A flate-rate guy, and no picture of the cordless impact beating the plugs down to final torque? You took them out with a ratchet?

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Old 04-07-2011, 12:09 PM   #6
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Default Re: 4L60E or 4L80E, How do you know?

GM used whatever in the 90s so very possible to have the 4L80E. My brother had a 93 a few years ago and it had the 4L80E and a semi-float 14 bolt... both also found on 3/4 ton trucks.
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Old 04-07-2011, 12:47 PM   #7
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Default Re: 4L60E or 4L80E, How do you know?

That's pretty good you got the 14bl SF rear end. Most K1500s came out with the 10bolt. I demolished mine when the G80 grenaded. What to do? Yup, replace with the 14bolt. It was nice to keep the 6lug pattern.


The phrase 'heavy half' floated around when talking about a 1500 with 2500 'stuff'.
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Old 04-07-2011, 01:22 PM   #8
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Default Re: 4L60E or 4L80E, How do you know?

I was under the impression "heavy half" started due to folks like myself with S10/S15s joking on Silverado owners for only being able to carry a few more pounds.

You can tell the different transmissions without getting underneath. If you load it hard or beat on it and it breaks, its a 4L60E. If not, its a 4L80E.
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Old 02-19-2012, 02:01 PM   #9
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Default Re: 4L60E or 4L80E, How do you know?

Thread revival, I know. But this question completely goes along with this one I think. I was at the part store to get the seal for the output on my tranny and I got what was supposed to be on it. It seemed small but I figured oh well. Got home and checked it against the drive shaft and the seal wasn't even close to the right size.

Is it possible that the truck (99 GMC Sierra Z71 1500 bought used) was purchased with an option to upgrade to a 4L80E? The size of seal the guy showed me that looked like the right one after I returned the one that didn't fit is for the 4L80E.
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Old 02-19-2012, 02:11 PM   #10
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Default Re: 4L60E or 4L80E, How do you know?

Not to pick, but GM should do what Ford does and list all the pertinent information on the drivers door tag: trans, rear axle ratio, trim, paint code, spring codes, etc. It would make life so much easier.
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Old 02-19-2012, 02:13 PM   #11
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Default Re: 4L60E or 4L80E, How do you know?

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Not to pick, but GM should do what Ford does and list all the pertinent information on the drivers door tag: trans, rear axle ratio, trim, paint code, spring codes, etc. It would make life so much easier.

GM puts their RPO codes in the glove box. I agree, would be great to have all details in one place. A VIN build sheet would be excellent to keep in the vehicle records file.
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Old 02-19-2012, 02:15 PM   #12
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Default Re: 4L60E or 4L80E, How do you know?

4l60E always use aq deep pan on trucks
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Old 02-19-2012, 02:33 PM   #13
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Default Re: 4L60E or 4L80E, How do you know?

Quote:
Originally Posted by Pugnaceous View Post
Thread revival, I know. But this question completely goes along with this one I think. I was at the part store to get the seal for the output on my tranny and I got what was supposed to be on it. It seemed small but I figured oh well. Got home and checked it against the drive shaft and the seal wasn't even close to the right size.

Is it possible that the truck (99 GMC Sierra Z71 1500 bought used) was purchased with an option to upgrade to a 4L80E? The size of seal the guy showed me that looked like the right one after I returned the one that didn't fit is for the 4L80E.
Is the truck an old body style or new body style?

How may bolts on the pan?

How many bolts attach to the tailhousing on the tranny?

Any idea what size Ujoint is used at the output yoke and the rear Dshaft?

In the first and last years of a model run there are often trucks that use parts from the old line up and the new line up. The 99 year model was the cross over year. The last of the old body style trucks were '99, then new body trucks also came in 99. Xover model vehicles make going shopping for parts very fun. I had a '94 but my truck used parts for the 94 and 95 year models. One part in particular was the starter. Mine used the smaller/cheaper starter, thankfully.
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Old 02-19-2012, 03:14 PM   #14
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Default Re: 4L60E or 4L80E, How do you know?

i work at napa also work on vehicles on the side. your truck probaby has 4l60 transmission. the pan is almost square if you have a deep pan it will have a sump in bottom of pan.
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Old 02-19-2012, 06:20 PM   #15
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Default Re: 4L60E or 4L80E, How do you know?

Easiest way is look at the wire harness connectors:

4L80E has the wire harness connector on the drivers side of the trans case facing out

4L60E has the wire connector facing up on the passenger side, top of case.
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Old 02-19-2012, 07:31 PM   #16
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Default Re: 4L60E or 4L80E, How do you know?

The deep dish pan started in about 1999 for the 4L60Es,that is when the body change started for the full size trucks and then it was the Suburban including Yukon and Tahoe in 2000.1998 was the last year body style before the body change.Read the built dates right on these trucks.If built September through December of 1998,it is a 1999.3/4 ton and one ton GM trucks with the 350 never came with the 4L60E,have the 4L80E.The 4L80E comes with a reusable pan gasket and most people make the huge mistake throwing it away if in good shape.The filter kits come with a pos and lousy black pan gasket,I toss them in the trash can for a reason.They leak and don't seal worth a crap.The cork gasket is better.
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