Cummins 4BT & Diesel Conversions Forums banner

521 - 530 of 530 Posts

·
Premium Member
Joined
·
348 Posts
Discussion Starter #521
I

I haven't been on here for a bit and had a little catching up to do! It's good to see your project coming along well!👌🏼
BTW I've got a good used 3912600 manifold if you're still in search of one.

Best of luck!
Glendon
Still got the manifold?
 

·
Registered
Joined
·
11,893 Posts
These are the kind of times when a standby generator could be a huge benefit. You can get them that run on most fuels. You'd want one where the fuel source wouldn't be interrupted. With no electric the gas pumps may not be working. Natural gas would be a good possibility or diesel. With a diesel you could have a couple hundred gallon tank on hand. Could rotate the fuel in that tank by using some in your truck. Just keep it topped off so no condensation accumulates. After hurricane Hugo back in 1989 we bought a Lincoln welder generator. Provides power to the workshop and have used it several times since to power the house during an outage. Generators are probably in short supply in Texas right now.
 

·
Premium Member
Joined
·
348 Posts
Discussion Starter #523
Finally was able to get out and do a little work on the swap. I changed out the hydraulic brake/ power steering hoses. I had to use a heater hose as a temporary replacement for the hydro-boost return to the power steering pump. I ordered the correct hose, but this will keep any contamination from the system in the meantime.

Hydraulic Hoses 2-20-21.jpg
 

·
Premium Member
Joined
·
348 Posts
Discussion Starter #524 (Edited)
Finally, I got the retailer to give me an update on the 3912600 Exhaust Manifold. Cummins is out of them globally. They won't have one available until April 16, 2021. I canceled the order. I am now looking for a good used one.

I connected the fuel lines yesterday as well. I just need to wire the new electronic pump on the frame. (Note:The pump is to be used for priming the fuel system, not for regular running. Although, when I purchased the Grumman van an electronic pump was used for running. I went back to stock.).

Then hit another problem. I ordered another transfer case with a 32 spline input to match the 4L80e transmission output. I needed to do this because the original 700r4 transmission has a 27 spline output and the NP208c transfer case has a matching 27 spline input. The six bolts which connect the transfer case to the adapter are M10x1.5x30. I purchased new bolts (flanged 10.9) to replace the existing bolts (unflanged). I found out that these are not the right bolts for the new NP208c transfer case (Same transfer case as before). Does anyone know if they changed bolt sizes through the years? The M10s do not want to fit.

UPDATE: The bolt size is 3/8-16 course. The bolts (6) are 1-1/4 inches long. Again I ordered flange bolts to increase the area of contact.
 

·
Registered
Joined
·
56 Posts
Yes, I still have the manifold.
 

·
Premium Member
Joined
·
348 Posts
Discussion Starter #526 (Edited)
Thanks, Yoder repower: Will you email me and give me the details (price + shipping)?

Update: Thanks for the email Yoder repower. I look forward to the exhaust manifold and getting the exhaust situation completed.
 

·
Premium Member
Joined
·
348 Posts
Discussion Starter #527 (Edited)
Finally, put the transfer case on today for the second and hopefully last time. This led to more questions for the forum.

The first is the brace (see picture) that bolts to the transfer case and the other end bolts to the engine's transmission housing. Since the 4L80e is a longer transmission (3 inches), does anyone sell a longer support brace? Or will I have to cut and extend mine?

The second is where does one find a dust cover for the 4bt-4l80e setup? I quickly learned that the 700R4 dust cover is not the right cover. Will the cheap knock-off eBay covers work?

Thanks in advance,

Tim
 

Attachments

·
Registered
Joined
·
11,893 Posts
I suspect you'll need to extend the rod. Shouldn't be terribly difficult. Measure the OD of the rod and find a piece of tubing with that ID to make a sleeve. Cut the rod and put the sleeve on so you have a slip joint. Then mount the rod and tack the sleeve in place. You can then weld it permanent. If you have a lathe you could also just make a coupling and weld it on. Don't know about the dust cover. Would one from a TH400 work?
 

·
Premium Member
Joined
·
348 Posts
Discussion Starter #529
I figured as much on the brace. Not sure if the th400 dust cover would work. I will try to research. Another issue I have to address is a clocking ring for the 4L80e to NP208c transfer case. Is it required? I see talk of the clocking ring bringing the transfer case up to allow more ground clearance for rock climbing. Not sure if it is required though. There is also some discussion on the 4L80e output shaft being too long for the NP208c. I bolted my up yesterday and didn't see any issues.
 

·
Registered
Joined
·
11,893 Posts
The reason I mentioned the TH400 as a possible is because the 4L80e basically is one. The 700R4 is a TH350.
 
521 - 530 of 530 Posts
Top