First start up l96 with 6l90 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mtdave2 · 09-25-2021, 10:21 PM

Gota lot these moments. I was surprised it started right up on first turn.
Also have to say the dakota digital dash sure makes things easy! Now I have to put it I the long horn

https://youtu.be/5odAiebFdmI

https://youtu.be/-vk18OphqwI

**MySons68C20** · 09-25-2021, 10:52 PM

Congrats, I love your engine run stand!

rowdy11 · 09-26-2021, 11:46 AM

Brilliant! I'm rocking the exact same setup (except for 4X4). Very excited for first startup...keep it up!

**mongocanfly** · 09-26-2021, 11:29 PM

Nice setup

mtdave2 · 09-28-2021, 10:45 AM

thanks, guess its time to stuff it into the longhorn now. ran the crap out of it and everything is working perfectly. it is fun to play with a motor on a stand like this. ones i have the old motor out ill stick it on the stand and try to figure out wtf is wrong with it.

gota love toys huh?

mtdave2 · 09-28-2021, 11:37 AM

https://youtu.be/HCxUIWmWNQA

kipps · 09-28-2021, 11:05 PM

Are you using the factory torque converter? I've heard the TC is the weak link in those transmissions, and that an improved aftermarket unit is highly recommended.

mtdave2 · 09-29-2021, 10:19 AM

Quote:

Originally Posted by kipps

Are you using the factory torque converter? I've heard the TC is the weak link in those transmissions, and that an improved aftermarket unit is highly recommended.

yeah, i have not touched it. the motor and trans have 9k miles on them so i was going to leave everything alone. though i had not heard of the TC issue.

kipps · 09-29-2021, 01:57 PM

Quote:

Originally Posted by mtdave2

yeah, i have not touched it. the motor and trans have 9k miles on them so i was going to leave everything alone. though i had not heard of the TC issue.

Contact Scotty Baccus at Tejas Steelworks(facebook works well, but I'm sure you can contact him otherwise). They make the Tejas mounts for shoving LS engines into squarebody trucks. Scotty has quite a bit of experience with the 6L80 and 6L90 transmissions with the various swaps he's done for himself and others. Ask him if he recommends an aftermarket converter. I would trust his advice; he shoots pretty straight.

I haven't personally looked into it much myself. I specifically chose a nv4500 over a 6L80e, in case that shows you where my allegiance lies!

hotrodbones · 10-07-2021, 02:09 PM

Did you use the E78 ECU and wiring harness that came with the motor? I have the same setup and was thinking about going with a PSI ECU and harness.

Love the valve covers, What brand are they?

mtdave2 · 10-08-2021, 09:34 AM

after lots of debate and talking with knowledgeable people i did not use the 78. there was no advantage to doing so, and lots of downsides. so i had speartech make me a harness with the 38.

mtdave2 · 10-08-2021, 09:35 AM

https://www.youtube.com/watch?v=HCxUIWmWNQA

better running video

hotrodbones · 10-08-2021, 11:37 AM

Thanks. I was talking with PSI about doing the same thing for my L96 and 6l90E. My donor was from a 2019 Isuzu NPR and was told the E78 is not friendly from the Isuzu.

What did Speartech charge you? Did they program the TCU also?

Quote:

Originally Posted by mtdave2

after lots of debate and talking with knowledgeable people i did not use the 78. there was no advantage to doing so, and lots of downsides. so i had speartech make me a harness with the 38.

**truckdude239** · 10-09-2021, 09:06 AM

what gaguges are those?

mtdave2 · 10-11-2021, 10:29 AM

Quote:

Originally Posted by hotrodbones

Thanks. I was talking with PSI about doing the same thing for my L96 and 6l90E. My donor was from a 2019 Isuzu NPR and was told the E78 is not friendly from the Isuzu.

What did Speartech charge you? Did they program the TCU also?

it was around $3k, but i got all sorts of extras like their pedal, gear display, switch shifter, intake, and more. they are expensive but i feel its totally worth it, a top-notch job.

I did send in the tcu for them to program as well.

mtdave2 · 10-11-2021, 10:31 AM

Quote:

Originally Posted by truckdude239

what gaguges are those?

Dakota Digital RTX-67C-PU-X

09-25-2021, 10:21 PM	#1
mtdave2 newly minted old timer Join Date: Dec 1999 Location: Hudson WI Posts: 3,521	First start up l96 with 6l90 Gota lot these moments. I was surprised it started right up on first turn. Also have to say the dakota digital dash sure makes things easy! Now I have to put it I the long horn https://youtu.be/5odAiebFdmI https://youtu.be/-vk18OphqwI Attached Images __________________ ____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban Last edited by mtdave2; 09-25-2021 at 10:36 PM.

09-25-2021, 10:52 PM	#2
MySons68C20 Senior Member Join Date: Sep 2014 Location: Wenatchee, Wa Posts: 929	Re: First start up l96 with 6l90 Congrats, I love your engine run stand!

09-26-2021, 11:46 AM	#3
rowdy11 Registered User Join Date: Nov 2017 Location: SLC Utah Posts: 210	Re: First start up l96 with 6l90 Brilliant! I'm rocking the exact same setup (except for 4X4). Very excited for first startup...keep it up! __________________ 1970 K10 Shortbed LS L96 6L90 Follow the entire mess below! Lola: My Moon Shot

09-26-2021, 11:29 PM	#4
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,670	Re: First start up l96 with 6l90 Nice setup __________________ 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

09-28-2021, 10:45 AM	#5
mtdave2 newly minted old timer Join Date: Dec 1999 Location: Hudson WI Posts: 3,521	Re: First start up l96 with 6l90 thanks, guess its time to stuff it into the longhorn now. ran the crap out of it and everything is working perfectly. it is fun to play with a motor on a stand like this. ones i have the old motor out ill stick it on the stand and try to figure out wtf is wrong with it. gota love toys huh? __________________ ____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban

09-28-2021, 11:37 AM	#6
mtdave2 newly minted old timer Join Date: Dec 1999 Location: Hudson WI Posts: 3,521	Re: First start up l96 with 6l90 https://youtu.be/HCxUIWmWNQA __________________ ____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban

09-28-2021, 11:05 PM	#7
kipps Registered User Join Date: Jul 2014 Location: North-central Virginia Posts: 1,104	Re: First start up l96 with 6l90 Are you using the factory torque converter? I've heard the TC is the weak link in those transmissions, and that an improved aftermarket unit is highly recommended. __________________ 1987 C6P V20 truck, 2010 LMG 5.3, AFM delete, 2010 Camaro exhaust manifolds, 1997 nv4500, 1991 np241c, hydroboost, 2005 14bff axle & driveshaft, drop-n-lock gooseneck, 4.10 gears, stock suspension, rims, and tires. Still a work in progress. Any questions or suggestions are welcome!

10-07-2021, 02:09 PM	#10
hotrodbones Registered User Join Date: Oct 2010 Location: Jax FL Posts: 8	Re: First start up l96 with 6l90 Did you use the E78 ECU and wiring harness that came with the motor? I have the same setup and was thinking about going with a PSI ECU and harness. Love the valve covers, What brand are they?

10-08-2021, 09:34 AM	#11
mtdave2 newly minted old timer Join Date: Dec 1999 Location: Hudson WI Posts: 3,521	Re: First start up l96 with 6l90 after lots of debate and talking with knowledgeable people i did not use the 78. there was no advantage to doing so, and lots of downsides. so i had speartech make me a harness with the 38. __________________ ____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban

10-08-2021, 09:35 AM	#12
mtdave2 newly minted old timer Join Date: Dec 1999 Location: Hudson WI Posts: 3,521	Re: First start up l96 with 6l90 https://www.youtube.com/watch?v=HCxUIWmWNQA better running video __________________ ____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban

10-09-2021, 09:06 AM	#14
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,237	Re: First start up l96 with 6l90 what gaguges are those? __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

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