conversion to an ls3/6L80 in a 91 camaro rs - LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums

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post #1 of 14 (permalink) Old 01-27-2009, 05:08 PM Thread Starter
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conversion to an ls3/6L80 in a 91 camaro rs

does anyone know exactly what is needed for an ls3/6l80 conversion into my 91 camaro other than the motor and tranny?
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post #2 of 14 (permalink) Old 01-27-2009, 06:19 PM
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computer, wiring harness, fuel pump, new front suspension, bigger brakes and rotors, and probably before too long a new rear end ,new motor and tranny mounts obviously and im probably forgetting some stuff but this will give you an idea of where to start hopefully

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post #3 of 14 (permalink) Old 01-28-2009, 04:30 PM Thread Starter
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well i found a conversion kit for an ls1 that comes with a wiring harness but im not sure if its the same thing, ive been looking for a rear end with posi disc, abs and traction control, and ive seen the motor mounts i need but is there a special tranny mount used?
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post #4 of 14 (permalink) Old 01-28-2009, 11:24 PM
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I don't know specifics about the 6L80E, but something tells me nobody has addressed it in the aftermarket yet. Fab time.

An LS1 harness won't work with an LS3. Some of it may, but TBW alone is beyond LS1 territory.

'82 Berlinetta, 2000 LS1/4L60E. LS6 intake, shaved 317 heads, free-flowing air intake, long tube headers, 3600 stall, 3.73 posi. Best: 12.57 @ 109 at 5800' elevation; 11.82 @ 114 at HPT.
'57 Bel Air, my 1st car. In work: LQ4, L92 heads, LS3 intake, Erson cam; 4L80E, 4000 stall; 9".
'08 GXP grocery getter.
'95 Silverado 2500HD 6.5 TD. Just 335k miles so far.
'96 Vette Base Coupe. New to the herd.
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post #5 of 14 (permalink) Old 01-29-2009, 05:19 PM Thread Starter
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hmmm well then i guess i need to look around for more parts
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post #6 of 14 (permalink) Old 01-30-2009, 04:29 PM
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Are you getting a new engine and transmission, or pulling them from a donor vehicle?
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post #7 of 14 (permalink) Old 01-30-2009, 08:01 PM Thread Starter
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The tranny is from a donor vehicle but the motor I'm buying brand new
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post #8 of 14 (permalink) Old 01-31-2009, 01:11 AM
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I assume the donor vehicle doesn't have the LS3. That would be your best source for the harness, if available.

I'm guessing the 6L80 won't have provision for the torque arm mount. What were you planning there?

'82 Berlinetta, 2000 LS1/4L60E. LS6 intake, shaved 317 heads, free-flowing air intake, long tube headers, 3600 stall, 3.73 posi. Best: 12.57 @ 109 at 5800' elevation; 11.82 @ 114 at HPT.
'57 Bel Air, my 1st car. In work: LQ4, L92 heads, LS3 intake, Erson cam; 4L80E, 4000 stall; 9".
'08 GXP grocery getter.
'95 Silverado 2500HD 6.5 TD. Just 335k miles so far.
'96 Vette Base Coupe. New to the herd.
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post #9 of 14 (permalink) Old 02-01-2009, 07:35 AM Thread Starter
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well i guess i will have to think of something maybe ill weld it to the tranny, dont know yet
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post #10 of 14 (permalink) Old 02-02-2009, 11:51 AM
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Fastening the torque arm to the crossmember would be a better route.
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post #11 of 14 (permalink) Old 02-02-2009, 09:48 PM Thread Starter
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yea that does sound easier
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post #12 of 14 (permalink) Old 10-20-2009, 09:50 AM
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LS3 swap in 3rd gen harness

Hey bro, contact John @ speartech fuel injection systems and he will custom build you a plug and play harness for that swap. He is the only one doing it for that swap right now. He is going to build one for me for my swap, their # 765-378-4908 ask for John.

Also if you want to put custom guages in your 90-92 camaro, Bruce @ Covans classic dash is also building a custom guage panel for 90-92 camaros as well so you can put a 200mph autometer phantom series speedo and the rest of the guages as well, I convinced him to start building them. They made them for 82-89 but not 90-92 so I called him and got the ball rolling cause w/ an LS3 a 110 or even 145mph wont cut it, you'll bury that 145 midway through 4th gear.
Contact Greg @ Covans classic dash @ 1-866-882-3525 .
Good Luck and let me know how you make out w/ your swap.
mikesanto70@yahoo.com
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post #13 of 14 (permalink) Old 10-20-2009, 04:15 PM
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I know a little about the 4L80E, but next to nothing about the 6L80E. Are they the same length? Mount location the same? Other issues???
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post #14 of 14 (permalink) Old 10-21-2009, 04:03 PM
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yeah i was wondering the same 4l80e vs 6l80e?

also, you could do a chassis mounted torque arm. it mounts to the two spot welded braces and replaces the flimsy stamp steel piece, assuming third gens are set up with one. i may be wrong here.


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