• Steel Soldiers now has a few new forums, read more about it at: New Munitions Forums!

  • Microsoft MSN, Live, Hotmail, Outlook email users may not be receiving emails. We are working to resolve this issue. Please add support@steelsoldiers.com to your trusted contacts.

6BT cummins (24 valve) swap

4x4nutz

Active member
Steel Soldiers Supporter
283
118
43
Location
Mico, Texas
Has anyone done the 6BT cummins (24 valve) swap and used the same 4L80E tranny? I have an 1151 with a turbo and I am not happy with the power. I also have a free cummins motor. Any help would be appreciated.
 

Mogman

Moderator
Staff member
Moderator
Steel Soldiers Supporter
7,017
9,695
113
Location
Papalote, TX
I have cruised a few Cummins sites and it looks like an expensive adapter. the common wisdom is without allot of upgrades the 24V will tear up the 4L80 because of the massive torque.
https://www.crossmembers.com/products/1989-2002-cummins-chevy-adapter-kit
 

Mogman

Moderator
Staff member
Moderator
Steel Soldiers Supporter
7,017
9,695
113
Location
Papalote, TX
Interestingly enough there were some van or bus applications that used the 6BT and a 4L80, that adapter angled the engine for clearance, I wonder if that would be useful in a HMMWV conversion????
I have no idea what mods were done to the engine as far as oil pan/pump pickup that may have been necessary
It looks like the 47RH is the preferred trans for many swaps, no computer and it can handle the 6BT power.
What is behind the 24V now??
 

4x4nutz

Active member
Steel Soldiers Supporter
283
118
43
Location
Mico, Texas
Funny...I just read what your taking about. I also read that you can't go over 400hp on the 4L80...we will still be under 300 I believe...even with the added turbo. Will keep you posted. Thanx for all your help brother!
 

Barrman

Well-known member
5,273
1,794
113
Location
Giddings, Texas
It isn’t the horse power that kills the automatics. It is the relentless torque and compression stroke power surges. Even the NV4500 manual had to go through several upgrades to handle the 6BT over the years. It never did get “bullet proof.” I suggest that whatever transmission you end up going with. Get 2. Don’t build the second unit until you figure out what fails on the first unit. Maybe by your 4th or 5th generation of improvements you will have THE 6BT automatic set up.

Kind of like Jericho Transmissions:

.
 

4x4nutz

Active member
Steel Soldiers Supporter
283
118
43
Location
Mico, Texas
Thank you! This is new deal for me, so all the info we can get helps. Just finding motor mounts has been an issue. Pretty expensive.
 

Mrgior31513

Active member
Steel Soldiers Supporter
85
117
33
Location
Fontana, Ca
According to specs, the ISB 5.9 24v cummins puts out varied torque numbers, I would highly recommend looking up the specifics of the engine that you have. The 4L80E is rated at 440ft-lb of input torque. The stock 6bt is about that, but the ISB 5.9 puts out considerably more torque on some of those engines. The torque varies on the ISB from 420-610 ft-lbs. Here is a link that has torque ratings for different years ISB 5.9 from Dodge donor:

If you want to use the 4L80E, here is something I found on some aftermarket modifications that may have some value if you want to use that transmission:
 

98G

Former SSG
Steel Soldiers Supporter
6,088
4,493
113
Location
AZ/KS/MO/OK/NM/NE, varies by the day...
It isn’t the horse power that kills the automatics. It is the relentless torque and compression stroke power surges. Even the NV4500 manual had to go through several upgrades to handle the 6BT over the years. It never did get “bullet proof.” I suggest that whatever transmission you end up going with. Get 2. Don’t build the second unit until you figure out what fails on the first unit. Maybe by your 4th or 5th generation of improvements you will have THE 6BT automatic set up.

Kind of like Jericho Transmissions:

.
G56...
 

Mogman

Moderator
Staff member
Moderator
Steel Soldiers Supporter
7,017
9,695
113
Location
Papalote, TX
Dang I did not realize the 6BT weighed 320lb more than the Dmax... it is however all cast iron which does have its advantages.
The Dmax only weighs about 80lb more than the 6.5T, adding 400lb will be noticed.
 

Jh_hay

New member
1
0
1
Location
Paris Texas
Has anyone done the 6BT cummins (24 valve) swap and used the same 4L80E tranny? I have an 1151 with a turbo and I am not happy with the power. I also have a free cummins motor. Any help would be appreciated.
Any update on how this project is going?
 

WillWagner

The Person You Were Warned About As A Child
Super Moderator
Steel Soldiers Supporter
8,546
2,786
113
Location
Monrovia, Ca.
Interestingly enough there were some van or bus applications that used the 6BT and a 4L80, that adapter angled the engine for clearance, I wonder if that would be useful in a HMMWV conversion????
I have no idea what mods were done to the engine as far as oil pan/pump pickup that may have been necessary
It looks like the 47RH is the preferred trans for many swaps, no computer and it can handle the 6BT power.
What is behind the 24V now??
It was a 4B, Frito Lay had a fleet of them, like 200 nationwide.

When swapping, remember, the RPM of the inline engine and V are different. 2500 max on the inline, unless it is a Dodge take out, then it was 2800 and I believe 4k on the V. Each 100 RPM is apx 2-3 MPH, so if one were cruising at 2500 RPM with the V, that would be redline on the inline, there is nothing more. With the V you still have more RPM to overtake, downshift on a hill, etc.

You will need gearing.
 
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website like our supporting vendors. Their ads help keep Steel Soldiers going. Please consider disabling your ad blockers for the site. Thanks!

I've Disabled AdBlock
No Thanks