Sponsored

AMW 425 5.7L HEMI installed by Rubitrux

KenNessee

KenNessee

Well-Known Member
First Name
Ken
Joined
Dec 15, 2017
Threads
9
Messages
71
Reaction score
118
Location
Knoxville, TN
Vehicle(s)
2014 JKRX
Picked it up Friday, 4 weeks to the day I dropped it off. I literally couldn't be happier with this AMW kit. And being able to run 87 octane with it, to me, makes it perfect.

Jeep Gladiator AMW 425 5.7L HEMI installed by Rubitrux 20250919_123306

Sponsored

 
Last edited by a moderator:
AmosMoses

AmosMoses

Well-Known Member
First Name
Amos
Joined
Jun 25, 2022
Threads
41
Messages
944
Reaction score
1,854
Location
Ohio
Vehicle(s)
2020 jeep gladiator sport
Occupation
Manufacturing
Nice! What kind of hp/tq numbers does that motor produce? Is the extra weight in the front end noticeable?
 
OP
OP
KenNessee

KenNessee

Well-Known Member
First Name
Ken
Joined
Dec 15, 2017
Threads
9
Messages
71
Reaction score
118
Location
Knoxville, TN
Vehicle(s)
2014 JKRX
AmosMoses said:
Nice! What kind of hp/tq numbers does that motor produce? Is the extra weight in the front end noticeable?
Click to expand...
I couldn't get an answer from AMW about the HP on 87 octane but the 91+ tune gets you 425 HP and 410 Ft lbs of torq. The weight isn't noticeable and nothing had to be changed out atleast with Metalcloak springs. Drives the same as it did before, maybe a little better planted but it's hard to tell.
 
ltdodge

ltdodge

Well-Known Member
Joined
Mar 13, 2024
Threads
13
Messages
89
Reaction score
126
Location
Florida
Vehicle(s)
2021 gladiator rubicon
how does the acceleration feel compared to the 3.6? very noticeable?
 

Sponsored

OP
OP
KenNessee

KenNessee

Well-Known Member
First Name
Ken
Joined
Dec 15, 2017
Threads
9
Messages
71
Reaction score
118
Location
Knoxville, TN
Vehicle(s)
2014 JKRX
ltdodge said:
how does the acceleration feel compared to the 3.6? very noticeable?
Click to expand...
I've got a heavy set up but it's not even comparable. The torq is ridiculous and driving it back from Boone I'd push the accelerator on the interstate and it seemed like light work for the 5.7 to blow by people when passing.
 
OP
OP
KenNessee

KenNessee

Well-Known Member
First Name
Ken
Joined
Dec 15, 2017
Threads
9
Messages
71
Reaction score
118
Location
Knoxville, TN
Vehicle(s)
2014 JKRX
Zachanadandy said:
Total cost installed?
Click to expand...
https://amw4x4.com/products/amw-405-hemi-345-8hp75-conversion-1

Plus tax, not a dime more. I made sure there weren't other costs I was missing before pulling the trigger. I had an aftermarket front drive shaft but sounds like stock drive shafts have enough slack to work. I have 4.88 gears which were great for the 3.6 but a little over geared now. Not enough to do anything about it but if I ever had to do the gears again I'd go back to 4.10.
 
ltdodge

ltdodge

Well-Known Member
Joined
Mar 13, 2024
Threads
13
Messages
89
Reaction score
126
Location
Florida
Vehicle(s)
2021 gladiator rubicon
My#8andlast said:
I've got a heavy set up but it's not even comparable. The torq is ridiculous and driving it back from Boone I'd push the accelerator on the interstate and it seemed like light work for the 5.7 to blow by people when passing.
Click to expand...
cool, im on the fence between the 5.7 or the 6.4. trying to determine if the extra 7k is worth the 6.4
 
smlobx

smlobx

Well-Known Member
First Name
Eddie
Joined
Jun 28, 2018
Threads
87
Messages
2,652
Reaction score
4,528
Location
Mid Atlantic
Vehicle(s)
JTR, F-350 diesel, Porsche Spyder, Model Y
Occupation
Semi retired consultant
My#8andlast said:
I've got a heavy set up but it's not even comparable. The torq is ridiculous and driving it back from Boone I'd push the accelerator on the interstate and it seemed like light work for the 5.7 to blow by people when passing.
Click to expand...
It looks like you and I have a similarly weighted rig.
I’d be very interested in your MPG difference (if any) after you stop smiling when you stomp on the GO! Pedal.
Im thinking that those of us with heavier rigs may not take a big hit on mileage.
 

Sponsored

OP
OP
KenNessee

KenNessee

Well-Known Member
First Name
Ken
Joined
Dec 15, 2017
Threads
9
Messages
71
Reaction score
118
Location
Knoxville, TN
Vehicle(s)
2014 JKRX
smlobx said:
It looks like you and I have a similarly weighted rig.
I’d be very interested in your MPG difference (if any) after you stop smiling when you stomp on the GO! Pedal.
Im thinking that those of us with heavier rigs may not take a big hit on mileage.
Click to expand...
I was at 14.5 mpg on the 3.6L and so far I'm averaging 17 mpg on 5.7L. I definitely don't get crazy with it, I was more after the torq. But it will get crazy.
 

dan2ktj

New Member
First Name
Dan
Joined
Jun 6, 2025
Threads
1
Messages
3
Reaction score
6
Location
Phoenix
Vehicle(s)
‘00 TJ, ‘22JL, ‘25JT, ‘67 Firebird, ‘07 Ducati MTS1100S
This is a performance sweet spot. Have you seen any information if this effects the towing capacity?
 

JTGuy

Well-Known Member
First Name
Pascual
Joined
Jul 23, 2023
Threads
57
Messages
1,748
Reaction score
1,680
Location
San Dimas CA
Vehicle(s)
20022 Jeep Gladiator
Occupation
Manager
With the 4.88s what size tire are you running? I am waiting for Calif to allow these,,, LOL. Looks like the upper radiator hose is pushing against the air intake.
 
RodRecket

RodRecket

Well-Known Member
Joined
Sep 13, 2019
Threads
31
Messages
1,151
Reaction score
1,484
Location
Minnesota
Vehicle(s)
2021 AEV JT370
That is awesome. Offroad I've never wanted more power than the 3.6 but when I'm pulling the camper cross country I'd really lile the extra torque. I think thw 5.7 and being able to run 87 is such a well rounded package. Very nice. Definitely the package I'd go for
 
Rahkmalla

Rahkmalla

Well-Known Member
First Name
Jim
Joined
Oct 20, 2021
Threads
38
Messages
2,036
Reaction score
4,714
Location
NJ
Vehicle(s)
22 Gobi Manual Mojave
Build Thread
Link
5.7 with a manual transmission is my dream gladiator
Sponsored

 
You must log in or register to reply here.

Similar threads

AMW 425 and axle gearing
Replies
1
Views
843
JTPatriot
JTPatriot
Exodus/AMW 425/345 Conversion
2 3 4
Replies
47
Views
5,867
Thunderspud
Thunderspud
My 5.7L Hemi Gladiator Conversion
31 32 33
Replies
494
Views
180,853
Griepp06
AMW 405 345 HEMI engine conversion ... begins
Replies
9
Views
2,726
RidinDirty
RidinDirty
5.7L Hemi Jeep Gladiator Driving Review - for those wondering what 5.7 V8 would be in a Gladiator…
9 10 11
Replies
155
Views
17,388
JTGuy
 







Top