LQ4/4L80E torque converter - The 1947 - Present Chevrolet & GMC Truck Message Board Network

LS army · 07-30-2018, 09:51 PM

hey everyone I hope this is the right spot for this I'm swapping a LQ4/4l80e into a 1976 k20 and I don't have any idea what stall converter I should use. I didn't get the original when I got the tranny, but I believe they are 2000RPM. Also this is my first automatic build so I'm unsure how to pick one. my truck has 4.10 gears nd I'm planning on using 33"tires the engine has a summit racing 218/227 Duration, .523/.524 Lift cam and LT headers. I'm planning on using the truck as a toy more then anything but would still like to be able to tow a trailer if a need to. I was thinking around a 2500-2700RPM stall would this work? or can someone recommend a good TC like I said this is my first auto trans and I'm confused thanks.

**mongocanfly** · 07-30-2018, 10:07 PM

Welcome....
4l80 is a great trans....like a t400 w/od....what is your plan for a transfer case?....I'm a manual trans guy so I don't know about your stall question.....

LS army · 07-31-2018, 10:16 AM

Quote:

Originally Posted by mongocanfly

Welcome....
4l80 is a great trans....like a t400 w/od....what is your plan for a transfer case?....I'm a manual trans guy so I don't know about your stall question.....

The trans came with a NP 243 transfer case so I’m gonna use it I doubt it will get used much though.
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Super73 · 07-30-2018, 10:14 PM

I have recently been using RoadRunner converters. If you call Jim there and tell him Shaun Liddy sent you he will for sure treat you right.

I am a big fan of BIG converters especially since you have a lock up trans (talking 4,500-5,000rpm, last one actually went to 6,200 on the N20 kit) but... That requires you to have an awesome tuner or the ability to tune yourself and take the time to do it right.

Oh, and a 4,500-5,000 stall would NOT be good for towing. It's mainly an issue with 1st as once you are in 2nd-4rth and the verter is locked, a good tripple disk will not slip even with a trailer behind you going up hill. But the time you are in first will heat up the trans.

No doubt a 4,500-5,000 rpm converter would wake it up out of the hole, but I would probably tell you to keep it to about 3,200 max with towing in mind. but call Jim, and tell him what you are doing.

**mongocanfly** · 07-31-2018, 02:28 PM

Isnt the 243 a driver side drop tc?....

RedRider · 08-31-2018, 02:16 PM

Bump...I'm interested in around 2,500-3,000 stall for my 4L80e. Any particular brands I should be looking at?

davepl · 09-01-2018, 10:40 AM

I wouldn't go more than 2500. That's not that much cam and you've got a lot of gear.

If it's a drag truck, put a LOT more cam and converter in it. But if it's a street truck you don't want to be too sloppy about the converter.

04ls1gto · 09-01-2018, 12:04 PM

A 2000-2400 would be a nice rpm. There is a lot more to a converter then just stall rpm. I had a precision and liked it a lot. Call them up and give combo and they will set you up with the right one

RedRider · 09-03-2018, 02:49 PM

How about Circle D, ACC, Hughes?

07-30-2018, 09:51 PM	#1
LS army Registered User Join Date: Jul 2018 Location: hamilton ontario Posts: 2	LQ4/4L80E torque converter hey everyone I hope this is the right spot for this I'm swapping a LQ4/4l80e into a 1976 k20 and I don't have any idea what stall converter I should use. I didn't get the original when I got the tranny, but I believe they are 2000RPM. Also this is my first automatic build so I'm unsure how to pick one. my truck has 4.10 gears nd I'm planning on using 33"tires the engine has a summit racing 218/227 Duration, .523/.524 Lift cam and LT headers. I'm planning on using the truck as a toy more then anything but would still like to be able to tow a trailer if a need to. I was thinking around a 2500-2700RPM stall would this work? or can someone recommend a good TC like I said this is my first auto trans and I'm confused thanks.

07-30-2018, 10:07 PM	#2
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,663	Re: LQ4/4L80E torque converter Welcome.... 4l80 is a great trans....like a t400 w/od....what is your plan for a transfer case?....I'm a manual trans guy so I don't know about your stall question..... __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver

07-30-2018, 10:14 PM	#4
Super73 Registered User Join Date: Nov 2007 Location: Bay Area, Ca Posts: 2,841	Re: LQ4/4L80E torque converter I have recently been using RoadRunner converters. If you call Jim there and tell him Shaun Liddy sent you he will for sure treat you right. I am a big fan of BIG converters especially since you have a lock up trans (talking 4,500-5,000rpm, last one actually went to 6,200 on the N20 kit) but... That requires you to have an awesome tuner or the ability to tune yourself and take the time to do it right. Oh, and a 4,500-5,000 stall would NOT be good for towing. It's mainly an issue with 1st as once you are in 2nd-4rth and the verter is locked, a good tripple disk will not slip even with a trailer behind you going up hill. But the time you are in first will heat up the trans. No doubt a 4,500-5,000 rpm converter would wake it up out of the hole, but I would probably tell you to keep it to about 3,200 max with towing in mind. but call Jim, and tell him what you are doing. __________________ ------Motor---------------Bottle 60'---1.53---------------1.41 1/8---6.58 @ 105.92----5.87 @ 118.41 1/4---10.38 @ 126.97----9.24 @ 142.49

07-31-2018, 02:28 PM	#5
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,663	Re: LQ4/4L80E torque converter Isnt the 243 a driver side drop tc?.... __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver

08-31-2018, 02:16 PM	#6
RedRider Registered User Join Date: Jan 2016 Location: Poway, CA Posts: 356	Re: LQ4/4L80E torque converter Bump...I'm interested in around 2,500-3,000 stall for my 4L80e. Any particular brands I should be looking at? __________________ 1970 C-10 "Old Yeller"

09-01-2018, 10:40 AM	#7
davepl Registered User Join Date: Aug 2006 Location: Redmond, WA Posts: 6,332	Re: LQ4/4L80E torque converter I wouldn't go more than 2500. That's not that much cam and you've got a lot of gear. If it's a drag truck, put a LOT more cam and converter in it. But if it's a street truck you don't want to be too sloppy about the converter. __________________ 1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible

09-01-2018, 12:04 PM	#8
04ls1gto Registered User Join Date: Aug 2014 Location: Portsmouth ri Posts: 363	Re: LQ4/4L80E torque converter A 2000-2400 would be a nice rpm. There is a lot more to a converter then just stall rpm. I had a precision and liked it a lot. Call them up and give combo and they will set you up with the right one

09-03-2018, 02:49 PM	#9
RedRider Registered User Join Date: Jan 2016 Location: Poway, CA Posts: 356	Re: LQ4/4L80E torque converter How about Circle D, ACC, Hughes? __________________ 1970 C-10 "Old Yeller"



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