Starting a 6.4 Hemi swap

[TwoCarGarageYT]

I'll admit I haven't read every work of every post, but a couple things stuck out to me reading through...

6.4 vs. 5.7 - beyond the benefits you laid out, just do some research on the BGE (Big Gas Engine) they are meant to take some abuse. Durability and additional cooling meant to take boost

4.88 vs 5.13 - You'll have enough torque to move 40's, especially in 4lo. I would gear for the highway, and I think you'll likely want to be in that 1800-2200 rpm range. For me (40s and 4.88s) that 70-75 mph. 4lo is an additional consideration. Granted I have more power with the 448ci stroker unit, but with the 4:1 tcase i"m pushing through 1 ton brakes.

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[Flyin6]

I'll admit I haven't read every work of every post, but a couple things stuck out to me reading through...

6.4 vs. 5.7 - beyond the benefits you laid out, just do some research on the BGE (Big Gas Engine) they are meant to take some abuse. Durability and additional cooling meant to take boost

4.88 vs 5.13 - You'll have enough torque to move 40's, especially in 4lo. I would gear for the highway, and I think you'll likely want to be in that 1800-2200 rpm range. For me (40s and 4.88s) that 70-75 mph. 4lo is an additional consideration. Granted I have more power with the 448ci stroker unit, but with the 4:1 tcase i"m pushing through 1 ton brakes.

I've done a lot of research on the 6.4 vs the 5.7...Two different motors in some ways. I chose the 6.4 SRT engine modified for the Jeep...

Gears. Right now, with an RTT and a rack, I want to say I have a "heavy" overland setup, which would suggest 4.88's with at least a 37" tire. But I have deleted a ton of stuff...Back seat, aluminum bumper, rear hitch, second battery. But then added a long-arm suspension, heavier steering, and RSE sliders, so the weight may be a wash between now and stock.
I would favor a 4.56 gear for highway driving, as you suggest, for the current tire size. I do not think I am willing to do both the gear change (again) and the 40" tire upgrade...

 

[Flyin6]

Oh, and on the brake thing: My plan was to go to TerraFlex's big brake kit. However, they can't accept any more than a 4.72" Backspace. My Borah wheels have a 5.73" B.S.
My solution is to install Ram dually studs which are M14 X 1.5 and 3.5" long. They have the same knurl (.630") as the stock Gladiator studs. Toss in a 1" wheel spacer and bingo, bigger brakes and able to keep the same wheel.

 

[40x40]

Oh, and on the brake thing: My plan was to go to TerraFlex's big brake kit. However, they can't accept any more than a 4.72" Backspace. My Borah wheels have a 5.73" B.S.
My solution is to install Ram dually studs which are M14 X 1.5 and 3.5" long. They have the same knurl (.630") as the stock Gladiator studs. Toss in a 1" wheel spacer and bingo, bigger brakes and able to keep the same wheel.

hello any updates on the hemi swap? i'm getting anxious as it will be 2 months saturday since it hit the shop!

 

[Flyin6]

hello any updates on the hemi swap? i'm getting anxious as it will be 2 months saturday since it hit the shop!

You're anxious!!!
Where does that put me???!!!! ;-)

There has been some work, I am told. The owner told me he had the 392/Mojave hood painted and assembled and possibly some engine assembly, but as far as I know, the Jeep is still in the warehouse! Yeah, I'm not all that happy, but still maintaining some degree of patience.

Mike, the owner, told me he took the Jeep in on the 4th of May because I wanted it gone. That is true; I did want it in the shop getting a Hemi, but I sent it then because he told me he could accept it on the 4th. I guess it may have been my misunderstanding; I thought that was when the work would commence.
In a conversation less than two weeks ago, Mike stated that he had told me he intended to get the Jeep into the shop in June. OK, well, it's June, I was thinking. I am a patient man, to a degree. I waited until yesterday to send them a message asking about the status. I have not received a response yet.

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