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Old 07-25-2022, 02:56 PM   #1
A.Delaney
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4L80E for an LS Swap.

Any certain years to look for? I’ve got an all aluminum LS6 I’m thinking needs to go in the C10. She’s a little beefed up with 10:1 pistons and a stroker crank so I figured the 80 would be better than the 60.
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Old 07-25-2022, 03:13 PM   #2
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Re: 4L80E for an LS Swap.

4l60 is 700r4..almost
4l80 is T400..almost
I dont know one yr over another, but I think if you find a good one you'll be ok
Just be sure you can get the electronics for it
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Old 07-25-2022, 03:55 PM   #3
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Re: 4L80E for an LS Swap.

You need one for 99 & later LS engine
They came behind the LQ4 6.0 truck engines and in the Corvette
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Old 07-25-2022, 04:14 PM   #4
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Re: 4L80E for an LS Swap.

Great thanks! I have seen the case differences between early and late models but wasn’t sure about the rest of the transmission. I just want whatever is the easiest for the swap.
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Old 07-26-2022, 08:47 AM   #5
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Re: 4L80E for an LS Swap.

I have a 1997 4L80E for my LS swap on my Chevelle, GM makes a dust cover for the earlier 4L80E's to bolt up to an LS.
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Old 07-26-2022, 11:11 AM   #6
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Re: 4L80E for an LS Swap.

Quote:
Originally Posted by THI View Post
I have a 1997 4L80E for my LS swap on my Chevelle, GM makes a dust cover for the earlier 4L80E's to bolt up to an LS.
You didn't run into issues with the torque converter to flex plate bolt circle?
The other gotcha I've heard is that you can't use all the bolt holes in the smallblock bellhousing when you mate it to the LS.
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1959 M35A2 LDT465-1D SOLD
1967 Dodge W200 B383, NP420/NP201 SOLD
1969 Dodge Polara 500 B383, A833 SOLD
1972 Ford F250 FE390, NP435/NP205 SOLD
1976 Chevy K20, 6.5L, NV4500/NP208 SOLD
1986 M1008 CUCV SOLD
2000 GMC C2500, TD6.5L, NV4500
2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263
2009 Impala SS LS4 V8


RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...Please include at least the year and model in your threads. It'll be easier to answer your questions.
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Old 07-26-2022, 11:42 AM   #7
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Re: 4L80E for an LS Swap.

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Originally Posted by hatzie View Post
You didn't run into issues with the torque converter to flex plate bolt circle?
The other gotcha I've heard is that you can't use all the bolt holes in the smallblock bellhousing when you mate it to the LS.
The bolt hole near the #8 cylinder is not drilled and tapped on the block because it there is not enough room for threads there on the LS block. It makes up for it with holes drilled and tapped in the oil pan - that is why there is a specific dust cover made by GM (19259119) to fit the earlier 4L80E's to an LS block.

As for the torque converter/flexplate issue, there are aftermarket flexplates that use the 6-bolt 11.5" bolt circle
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Old 07-26-2022, 02:36 PM   #8
A.Delaney
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Re: 4L80E for an LS Swap.

Quote:
Originally Posted by hatzie View Post
You didn't run into issues with the torque converter to flex plate bolt circle?
The other gotcha I've heard is that you can't use all the bolt holes in the smallblock bellhousing when you mate it to the LS.
Was this the reason for the 99 and later?
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Old 07-26-2022, 05:47 PM   #9
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Re: 4L80E for an LS Swap.

Two of them

There are reliability modifications on newer transmissions similar to getting a late 80's early 90's 700R4 4L60 rather than a 1982-86 unit
Planetary lube circuits on the earlier transmissions have a rep for starving and burning up the planetary gearsets.

Electrical will differ somewhat on the older units. You can get proper pigtails to mate with your PCM.

The newer transmissions from the T800 trucks and LS engine vans should be easier to find than units from the T400 chassis.

You can mix and match but I'd rather get the engine and transmission out of the same generation rig if possible. It avoids a bunch of specialized parts chasing.
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1959 M35A2 LDT465-1D SOLD
1967 Dodge W200 B383, NP420/NP201 SOLD
1969 Dodge Polara 500 B383, A833 SOLD
1972 Ford F250 FE390, NP435/NP205 SOLD
1976 Chevy K20, 6.5L, NV4500/NP208 SOLD
1986 M1008 CUCV SOLD
2000 GMC C2500, TD6.5L, NV4500
2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263
2009 Impala SS LS4 V8


RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...Please include at least the year and model in your threads. It'll be easier to answer your questions.
And please let us know if and how your repairs were successful.

Last edited by hatzie; 07-26-2022 at 05:53 PM.
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Old 07-27-2022, 10:46 PM   #10
A.Delaney
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Re: 4L80E for an LS Swap.

I’ll look for an early 2000’s model. I don’t have any of the wiring or computer yet. Just the engine. It basically a long block. There’s no intake or throttle body on it yet.
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