V8 Qngine Swap
10-25-2015 | 07:48 AM
#1
Thread Starter
JK Newbie
Joined: Feb 2015
Posts: 35
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From: Texas
V8 Engine Swap
I need help from the experts I'm going to do an engine swap what is the best Chevrolet V8 5.3 , 5.7 ,6.0 LS1 aluminum or is cast block ok what is best auto trans and can I use my transfer case or do I need to buy a new one. I have access to an iron block 5.3 out 2002 chevy.
Last edited by Motodad 73; 10-25-2015 at 08:46 AM.
10-25-2015 | 02:15 PM
#2
JK Enthusiast
Joined: May 2015
Posts: 194
Likes: 0
From: Canton,MI
I need help from the experts I'm going to do an engine swap what is the best Chevrolet V8 5.3 , 5.7 ,6.0 LS1 aluminum or is cast block ok what is best auto trans and can I use my transfer case or do I need to buy a new one. I have access to an iron block 5.3 out 2002 chevy.
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10-25-2015 | 03:50 PM
#3
Super Moderator
Joined: Feb 2012
Posts: 3,068
Likes: 116
From: Bunnlevel, NC
I need help from the experts I'm going to do an engine swap what is the best Chevrolet V8 5.3 , 5.7 ,6.0 LS1 aluminum or is cast block ok what is best auto trans and can I use my transfer case or do I need to buy a new one. I have access to an iron block 5.3 out 2002 chevy.
But, to get you started.
Which of the engines is best for you depends on what you expect to do with it. (Call MoTech, they will talk with you and then make a recommendation)
Auto trans - 6L80E
If you have a rubicon transfer case then you'll want to swap for the NV241 (2.72:1) tc.
Again, call MoTech.
10-25-2015 | 03:51 PM
#4
Thread Starter
JK Newbie
Joined: Feb 2015
Posts: 35
Likes: 0
From: Texas
What davids2011jk said....
But, to get you started.
Which of the engines is best for you depends on what you expect to do with it. (Call MoTech, they will talk with you and then make a recommendation)
Auto trans - 6L80E
If you have a rubicon transfer case then you'll want to swap for the NV241 (2.72:1) tc.
Again, call MoTech.
But, to get you started.
Which of the engines is best for you depends on what you expect to do with it. (Call MoTech, they will talk with you and then make a recommendation)
Auto trans - 6L80E
If you have a rubicon transfer case then you'll want to swap for the NV241 (2.72:1) tc.
Again, call MoTech.
10-25-2015 | 04:00 PM
#5
JK Super Freak
Joined: Apr 2007
Posts: 1,258
Likes: 1
From: Prosper, TX
What davids2011jk said....
But, to get you started.
Which of the engines is best for you depends on what you expect to do with it. (Call MoTech, they will talk with you and then make a recommendation)
Auto trans - 6L80E
If you have a rubicon transfer case then you'll want to swap for the NV241 (2.72:1) tc.
Again, call MoTech.
But, to get you started.
Which of the engines is best for you depends on what you expect to do with it. (Call MoTech, they will talk with you and then make a recommendation)
Auto trans - 6L80E
If you have a rubicon transfer case then you'll want to swap for the NV241 (2.72:1) tc.
Again, call MoTech.
.
10-25-2015 | 04:08 PM
#6
JK Freak
Joined: Jun 2009
Posts: 929
Likes: 3
From: Marshall, Texas
The 6L80 output shaft is larger than the 4L60
The input gear on the rubi case is smaller than the ordinary case and cant be reliably drilled out to take the torque of the larger 6L80 shaft without risking complete failure or shattering of the gear. Some companies claim they can do it using special hardening techniques but spirited driving may result in a wrecker ride home and 4 figure repair bills.
I ran into this issue and swapped tcases and some cash to get the regular tcase. The first gear on the 6L80 is much lower than the 4L60 and achieves a similar final 4lo drive ratio
The input gear on the rubi case is smaller than the ordinary case and cant be reliably drilled out to take the torque of the larger 6L80 shaft without risking complete failure or shattering of the gear. Some companies claim they can do it using special hardening techniques but spirited driving may result in a wrecker ride home and 4 figure repair bills.
I ran into this issue and swapped tcases and some cash to get the regular tcase. The first gear on the 6L80 is much lower than the 4L60 and achieves a similar final 4lo drive ratio
10-25-2015 | 05:11 PM
#7
Super Moderator
Joined: Feb 2012
Posts: 3,068
Likes: 116
From: Bunnlevel, NC
The 6L80 output shaft is larger than the 4L60
The input gear on the rubi case is smaller than the ordinary case and cant be reliably drilled out to take the torque of the larger 6L80 shaft without risking complete failure or shattering of the gear. Some companies claim they can do it using special hardening techniques but spirited driving may result in a wrecker ride home and 4 figure repair bills.
I ran into this issue and swapped tcases and some cash to get the regular tcase. The first gear on the 6L80 is much lower than the 4L60 and achieves a similar final 4lo drive ratio
The input gear on the rubi case is smaller than the ordinary case and cant be reliably drilled out to take the torque of the larger 6L80 shaft without risking complete failure or shattering of the gear. Some companies claim they can do it using special hardening techniques but spirited driving may result in a wrecker ride home and 4 figure repair bills.
I ran into this issue and swapped tcases and some cash to get the regular tcase. The first gear on the 6L80 is much lower than the 4L60 and achieves a similar final 4lo drive ratio
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10-26-2015 | 06:43 AM
#8
JK Junkie
Joined: Jun 2013
Posts: 3,697
Likes: 2
From: Grosse Pointe, MI
The 1st gear ratio of the 07-11 auto is 2.84. Yes, in that case to maintain the same ratio in 4 lo, you swap the case. The manual trans has a 4.46 ratio for 07-15. New auto is 3.59 and the 6l80 is around 4.06.
The old auto started with a poor crawl ratio. Leaving the Rubi case in is the way to go. I use a manual and a 4:1 case and wish at times I had an atlas 5:1. Anyway, the new auto is very close to using a 6l80 and a 4:1.
That all said, I appreciate the poor advice from Motech as that's how I got a Rubi case for $500.
10-27-2015 | 05:41 AM
#10
Super Moderator
Joined: Feb 2012
Posts: 3,068
Likes: 116
From: Bunnlevel, NC
I'm not sure why this ever became the norm, other than the assumption is that the typical swap user doesn't do any hardcore wheeling.
The 1st gear ratio of the 07-11 auto is 2.84. Yes, in that case to maintain the same ratio in 4 lo, you swap the case. The manual trans has a 4.46 ratio for 07-15. New auto is 3.59 and the 6l80 is around 4.06.
The old auto started with a poor crawl ratio. Leaving the Rubi case in is the way to go. I use a manual and a 4:1 case and wish at times I had an atlas 5:1. Anyway, the new auto is very close to using a 6l80 and a 4:1.
That all said, I appreciate the poor advice from Motech as that's how I got a Rubi case for $500.
The 1st gear ratio of the 07-11 auto is 2.84. Yes, in that case to maintain the same ratio in 4 lo, you swap the case. The manual trans has a 4.46 ratio for 07-15. New auto is 3.59 and the 6l80 is around 4.06.
The old auto started with a poor crawl ratio. Leaving the Rubi case in is the way to go. I use a manual and a 4:1 case and wish at times I had an atlas 5:1. Anyway, the new auto is very close to using a 6l80 and a 4:1.
That all said, I appreciate the poor advice from Motech as that's how I got a Rubi case for $500.
I know there are companies that keep the Rubi TC with their conversions. I can't profess to know if that's a good or bad idea (and the same for MoTech's approach of switching to the non-Rubi TC).
I will admit, that I do wish I had a lower overall crawl ratio than I have now. (combination of 6L80, non-Rubi TC, and 4.10 gears). We'll see what I think after I've got the Ford 1-tons in with lower diff gears. And, probably move to at Atlas after that.