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Thread: Motech swap questions with Gen IV 480hp LS3 crate engine

  1. #11
    Nothing but a Thing highoctane's Avatar
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    Thanks Motech for the info! Will help me to start sourcing a xfer case and transmission. I'll likely get the crate engine from Summit Racing and just buy GM front engine accessories from a parts store or dealership. I already have PSC hydraulic assist on my 3.6 JK with the PSC pump. Sounds like your saying I have the option to use that pump with the GM accessories? I have 40s so the camaro pump wouldn't be up to the task.


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  2. #12
    Been Around the Block scrhino's Avatar
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    Quote Originally Posted by highoctane View Post
    Thanks Motech for the info! Will help me to start sourcing a xfer case and transmission. I'll likely get the crate engine from Summit Racing and just buy GM front engine accessories from a parts store or dealership. I already have PSC hydraulic assist on my 3.6 JK with the PSC pump. Sounds like your saying I have the option to use that pump with the GM accessories? I have 40s so the camaro pump wouldn't be up to the task.


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    So curious if you're still looking at the 480/495?
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  3. #13
    Nothing but a Thing highoctane's Avatar
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    Quote Originally Posted by scrhino View Post
    So curious if you're still looking at the 480/495?
    Still planning on it.


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  4. #14
    Been Around the Block scrhino's Avatar
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    Quote Originally Posted by highoctane View Post
    Still planning on it.


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    You'll love it. If you keep your 5.38s, you'll probably never downshift from 6th gear on the highway.
    Liston

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  5. #15
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    Quote Originally Posted by highoctane View Post
    Thanks Motech for the info! Will help me to start sourcing a xfer case and transmission. I'll likely get the crate engine from Summit Racing and just buy GM front engine accessories from a parts store or dealership. I already have PSC hydraulic assist on my 3.6 JK with the PSC pump. Sounds like your saying I have the option to use that pump with the GM accessories? I have 40s so the camaro pump wouldn't be up to the task.


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    We can fit the early PSC JK pump to the CTV drive, we have a small bracket that allows you to use the stock Camaro reservoir.

  6. #16
    Hooked BigPrince's Avatar
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    Quote Originally Posted by scrhino View Post
    You'll love it. If you keep your 5.38s, you'll probably never downshift from 6th gear on the highway.
    With the proposed engine/trans in this thread (430/495 6l80), what gearing does Motech recommend for Atlas TC and axles? I have 5.38 in my axles and a 4.3 Atlas II currently in my 2014 3.6l. Wondering if it would be worthwhile sending to AA to redo the current Atlas or buy new. Anyone run a 4speed? I also have a PSC pump/hydro assist already and appreciate the early info.

  7. #17
    Been Around the Block scrhino's Avatar
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    Quote Originally Posted by BigPrince View Post
    With the proposed engine/trans in this thread (430/495 6l80), what gearing does Motech recommend for Atlas TC and axles? I have 5.38 in my axles and a 4.3 Atlas II currently in my 2014 3.6l. Wondering if it would be worthwhile sending to AA to redo the current Atlas or buy new. Anyone run a 4speed? I also have a PSC pump/hydro assist already and appreciate the early info.
    I guess you're running 40s. Eddie is running 5.38s w/ a 3.0 Atlas which you probably would want to go that route. And 4 speed would be unnecessary. I'll be running 60/80 axles next month but with 4.88s and a 3.8 Atlas. Plus I'm running 37s. I'll be running a little bit slow with 3.8 but I'm currently running 2.72 which to me is a little fast. Hope I'll be happy.
    Liston

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  8. #18
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    Quote Originally Posted by BigPrince View Post
    With the proposed engine/trans in this thread (430/495 6l80), what gearing does Motech recommend for Atlas TC and axles? I have 5.38 in my axles and a 4.3 Atlas II currently in my 2014 3.6l. Wondering if it would be worthwhile sending to AA to redo the current Atlas or buy new. Anyone run a 4speed? I also have a PSC pump/hydro assist already and appreciate the early info.
    TBH I like the LS3 430, I prefer the drivability over the 480 HP engine. We find the LS3 430 HP engine has about 450 HP at the crank and will outperform a stock 6.4 Hemi when running a 6l80 transmission.

    The 6l80 is a strong transmission and it is unlikely you will break it even with a supercharged LS, we have run them in 700 HP engines with no problem. Our 6l80-241J TC adapter is good to 500 HP, we have many running behind the 495 engine. The Atlas 2 is a good choice if you need it - 2WD low and front wheel drive. If you don't need an A2 the 241J works great. I do not recommend(and neither does Advance) the Atlas 4 or the 241OR TC, they don't deal well with the torque. We also support the 6l90 transmission but realistically I would not run a 6l90
    unless I already had one.

    Stock 44 axles can hold up well with a 6.2 engine with tires under 37", if your running larger than 37's you want to beef up your stock axles or go with some 60's or... I like the D80 rear and D60 front combination. I have 80,000 miles on my stock 44's with a 6.2 with no issues because I drive conservative and that is what matters, you can break axles with a 3.8 in low range if you drive like a gorilla. But for the most part if running a 6.2 with 40's beef up the axles, if running 35" or smaller tires you can get away with the stock axles.

    We have recommended gearing and you shouldn't gear an LS like a Hemi or V6. The diverse gearing of the 6l80 means you can launch hard with a 4:1 first gear and cruise at low rpm with a 2cd OD of .66. This means you can run 37's on 4:10's and still get reasonable performance. For general driving(both off road and highway) we like to shoot for a 2,000 rpm cruise speed at 70 mph. This gives you good off road performance with a 3:1 TC and good economy on the highway. So for general guidelines:

    35's - 4:10's
    37's - 4:56's
    40's - 5:13's.

    Now the LS is tolerant to gearing due to the 6l80 transmission and lots of torque. If towing or you live in the mountains of Colorado go up one gear size, so 4:88's with 37's instead of 4:56's. If you do mostly highway driving go down one gear size, so 4:10's with 37's instead of 4:56's. Do not go too low on the TC ratio unless you have a need. A 3.8, 4 or 5:1 TC is great on a rock but sucks on trails. With a 4:1 TC your screaming the engine in 6th gear to go 15 mph down a trail and with the torque of the LS you don't need to do that.

  9. #19
    Hooked BigPrince's Avatar
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    Quote Originally Posted by scrhino View Post
    I guess you're running 40s. Eddie is running 5.38s w/ a 3.0 Atlas which you probably would want to go that route. And 4 speed would be unnecessary. I'll be running 60/80 axles next month but with 4.88s and a 3.8 Atlas. Plus I'm running 37s. I'll be running a little bit slow with 3.8 but I'm currently running 2.72 which to me is a little fast. Hope I'll be happy.
    I'm running 60 front, Sterling rear, and 41.5" Pitbulls. For the crawling we do, I would like to run the numbers on a 4 speed if the computer doesn't have a problem with it(?).

    Eddie has a different primary use case being in Nevada. You're from Auburn - ever go to Chocco? The guys I've seen do Boatramp have been ultra low geared going slow and I've seen bouncers throw big HP at it and not make it.

    Motech - thanks for the overview. Sounds like both of y'all agree 5.38s would be ok, if a little torquey, with 40-42s. I may just want to swap out or regear(if possible) the Atlas. Figured I would need to change the input, maybe just do that and see how much I like/hate it and go from there when the time for the conversion comes.

    Thanks!

  10. #20
    Nothing but a Thing highoctane's Avatar
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    I live at nearly 6k feet in northern AZ, and frequently drive long, steep mountain grades on I17 in AZ, so I'll for sure be staying with the 5.38 gears in my Dynatrac axles. By swapping in the 241J with the 2.72:1 low range I'll be just fine offroad. If I ever break the xfer case or adapter I'll go to an Atlas II.


    Sent from my iPhone using WAYALIFE mobile app
    2015 Anvil Rubicon Unlimited
    Evo Mfg Double Throwdown suspension w/Evo Lever
    Evo Mfg high clearance long arms
    Evo Mfg PR60 high steer w/PSC hydraulic assist
    Dynatrac ProRock XD60 front axle
    Dynatrac ProRock 80 rear axle
    ARB lockers & 5.38 gears
    JE Reel 1350 front/1410 rear driveshafts
    Evo Mfg rocker/corner armor/bumper
    17" ATX Slabs & 40" Nitto Mud Grapplers


    Proud to be one of Uncle Sam's Misguided Children 2001 - 2010. Semper Fi




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