Builds another cummins swap thread/build thread (1 Viewer)

This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.

From what I've seen Dustin has made the kit "simple" for any DIY to complete at home in a few weekends.
 
Hi guys, wanted to let you know I made it up to Diesel Adapters to meet Dustin and check out his shop on Thursday...

It was nice to meet and go over a few things you guys are talking about right now...

He showed me a lower profile intake horn he has just gotten that should fix the height concerns/issues

Also he had just gotten in the new air intake box... Looks nice (see pic)

So I guess I am about ready to take my FJ 80 out of commission and remove the engine and tranny. Dustin said he would need the torque converter and the wiring harness first.

Regarding the transmissions

The 440 and 343 have the same bolt pattern in the bell housing. The concern is the 440 ('91&'92) is not electronic controlled so your shift points more or less are what they are... may work out fine or may shift way too late for what a diesel engine would really need. The 343 you can tell when you want it to shift via the Compushift controller... I believe both transmissions should handle the 6BT. I also believe the 440 is a bigger stronger transmission (not by a lot but still), in other countries the 440 was used in buses and heavier duty applications, that's y some people refer to it as the "bus tranny". My cruiser is a 1992 w/440. I picked up a 343 trans and will probably use that. I would like to try the 440 but wrestle with being the guinea pig and finding out I wish I would've gone with the 343 for shift point reasons...

I got my 2.5" OME lift (from Slee) installed, heavy springs in the front medium "level stance" in rear with Firestone coil-rite airbags all new sport shocks and caster correction. Kinda stiff in front without added weight of 6bt

Nice work, keep it up!

Cheers :)

Engine pic is of Fzj80 at diesel adapters... Other pic is my 1992

ImageUploadedByIH8MUD Forum1421514238.277715.jpg
ImageUploadedByIH8MUD Forum1421514299.411421.jpg
 
Sweet, so u can get the bell housing for either tranny!
How tough is the overall swap?
Would it be close to the same amount of work as say a 5.3 ls swap?
Was leaning that way but if the 6bt is a little easier and not crazy more expensive I may play the traitor card and jump ship


I was in your shoes and totally decided to jump ship... Huge torque, power, fuel economy...are all real good reasons. I am driving a 96 2wd Cummins right now that is the donor vehicle and I cannot wait to get it into my cruiser!! Estimated 20mpg will really make it be a great daily driver!

Cheers :)
 
Hi guys, wanted to let you know I made it up to Diesel Adapters to meet Dustin and check out his shop on Thursday...

It was nice to meet and go over a few things you guys are talking about right now...

He showed me a lower profile intake horn he has just gotten that should fix the height concerns/issues

Also he had just gotten in the new air intake box... Looks nice (see pic)

So I guess I am about ready to take my FJ 80 out of commission and remove the engine and tranny. Dustin said he would need the torque converter and the wiring harness first.

Regarding the transmissions

The 440 and 343 have the same bolt pattern in the bell housing. The concern is the 440 ('91&'92) is not electronic controlled so your shift points more or less are what they are... may work out fine or may shift way too late for what a diesel engine would really need. The 343 you can tell when you want it to shift via the Compushift controller... I believe both transmissions should handle the 6BT. I also believe the 440 is a bigger stronger transmission (not by a lot but still), in other countries the 440 was used in buses and heavier duty applications, that's y some people refer to it as the "bus tranny". My cruiser is a 1992 w/440. I picked up a 343 trans and will probably use that. I would like to try the 440 but wrestle with being the guinea pig and finding out I wish I would've gone with the 343 for shift point reasons...

I got my 2.5" OME lift (from Slee) installed, heavy springs in the front medium "level stance" in rear with Firestone coil-rite airbags all new sport shocks and caster correction. Kinda stiff in front without added weight of 6bt

Nice work, keep it up!

Cheers :)

Engine pic is of Fzj80 at diesel adapters... Other pic is my 1992

View attachment 1018524View attachment 1018525
Thanks for the pics. One question why not use the 442 auto which has lockup? Seemed to be good enough to run behind the 1hz Toyota diesel. I just had one built for a friends Cummins swap we are going to be doing.
ImageUploadedByIH8MUD Forum1421519457.393869.jpg

VB was upgraded and machined some parts to add more clutches. TC was rebuilt and added a lower stall.
 
Thanks for the pics. One question why not use the 442 auto which has lockup? Seemed to be good enough to run behind the 1hz Toyota diesel. I just had one built for a friends Cummins swap we are going to be doing. View attachment 1018547
VB was upgraded and machined some parts to add more clutches. TC was rebuilt and added a lower stall.

Good point I think the 442 would be an excellent choice. I don't know enough about it to know for sure the electronic tuning that can be done to it as far as controlling shift points (again, if you would really even need to is an unknown for me) I ended up with a low mileage 343 out of a 95 & the 343's are a lot more common, at least in my neck of the woods... With the 343 I know you can control it with the Compushift programmer.

I believe the 442's only came in the last few months of the '92 model through mid '93 or maybe the end of '93?? I think a 442 is basically a 440 with some electronics incorporated??

So for us owners of a 91 or 92 with the 440 we would need to be looking for the 442 or 343 if we want to be able to change shift points... is my best understanding...


Thanks for chiming in & any input you have is appreciated :)
 
Compushift also has a controller for the a442 also. I personally think the a343 will hold up to a stock 6bt but not one pushing some decent power. Now some will chime in and say "well I'm running 600hp through one". I believe them, but that peak power is more then likely hitting at high rpms versus the Cummins lays it down on the bottom end. So that is why vb kits, boosting line pressure and having a good torque converter is key to your trans holding up.
 
Thanks for the pics. One question why not use the 442 auto which has lockup? Seemed to be good enough to run behind the 1hz Toyota diesel. I just had one built for a friends Cummins swap we are going to be doing. View attachment 1018547
VB was upgraded and machined some parts to add more clutches. TC was rebuilt and added a lower stall.
1hz to cummins is apples and oranges
 
And you'd trust a trans more that came behind a 1fz vs a diesel? I'm not saying the a343 is a bad trans I just personally think the a442 is built beefier. What trans are you running?
 
No I'm doubtful long term that any of them are going to hold up to more than stock power. I think if anyone is going to find out it'll be turbophil.

The 1hz doesn't have near the torque or power, even turbod and built. Nothing that's been put in front of a toyota trans has the same kind of torque off idle and torque impulses as a cummins. Cummins tear s*** apart.

Start throwing simple mods at a p pumped cummins and it's bound to destroy s***.

Give it time and I think we'll see some trans failures, but that's just my opinion. I haven't built any toyota trans but I do know a little about stock dodge autos and how they've held up.

I'm running a getrag and an np205 with tons and 40s so...
 
The A343F Toyota trans will hold the stock Cummins 440ft/lbs with just a shift kit, but if you really want to start turning the Cummins up the toyota trans is going to have a lot of issues and there really is nothing to "build" with the toyota trans, there are no built inputs or baskets, about the only thing I could find was a slight bump in clutch material. I would think with the firmest shift kit you are pretty good at 600-650ft/lbs all day. I have 680ft/lbs peak around 505 all wheel, and I have had no issues with the trans, knock on wood.
 
Last edited:
No I'm doubtful long term that any of them are going to hold up to more than stock power. I think if anyone is going to find out it'll be turbophil.

The 1hz doesn't have near the torque or power, even turbod and built. Nothing that's been put in front of a toyota trans has the same kind of torque off idle and torque impulses as a cummins. Cummins tear **** apart.

Start throwing simple mods at a p pumped cummins and it's bound to destroy ****.

Give it time and I think we'll see some trans failures, but that's just my opinion. I haven't built any toyota trans but I do know a little about stock dodge autos and how they've held up.

I'm running a getrag and an np205 with tons and 40s so...
Reason I asked what trans your running Is because I was curious on what your experience has been so far with the Toyota trans. Even the Getrag isn't a very strong manual trans either but sure it's good for now.

The 47/48re are good trans but even they need work to last... I contemplated running a 47re but Dustin said it makes the drivetrain too long. Ideally the Dodge auto would be best but as you put it we will see some failures and maybe we can fine tune it after that.
 
IMLE- The compushift has been pretty good to work with on the 343 for the limited time I've had my 6BT. I spent a good bit of time dialing in the TC and shift points and that has made a huge difference.

The shift kit made a huge difference. I was worried about the trans holding the power with the spongy shifts prior to the shift kit, but feels confident now... Now, the primary concern is twisting the input shaft off--- it's TINY! Glad to see others not mention that though...

No idea of the Tq my 6BT is making, but it's pretty potent. We installed a 3800 gov spring and shift points are set to ~3200 RPM at WOT with the compushift (pump is turned up a good bit, but keeping it shy of rolling a bunch of coal). I'm not running an intercooler and probably won't just to keep things simple.

-Phil
 

Users who are viewing this thread

Back
Top Bottom