Another FJ40 to FJ45ish Thread

Joined
May 19, 2017
Messages
71
Location
Missoula Montana
I have been working on a heavily modified FJ 40 to FJ 45 type of build for a while. Over the next little while I plan to post some pics for reference. Happy to answer any questions. Here is the starting point which was a 69 FJ40 basket case. One of two I bought.

A1945E8E-840C-432C-A4CA-1620E803C04E.jpeg
 
Joined
May 19, 2017
Messages
71
Location
Missoula Montana
Adding 17 inches to the wheel base. This is an old section of FJ40 frame. Fish plates coming next. The goal is to use the later cab which is about 2 inches deeper with the older bed which is another two inches longer.

26263B1E-25D4-4675-8FAA-089959B84BC8.jpeg
 
Joined
May 19, 2017
Messages
71
Location
Missoula Montana
Starting to install fish plates. The inside of the frame gets shorter fish plates at the joints. A close friend has cut more Jeep frames than anyone in the country and this was the method he recommended based on their experience. Yes, we discussed 30-45 degree frame cuts. I decided to not reinvent the wheel.

B4CDBEF7-2DE8-40E7-BC77-A5AC89EEA625.jpeg


7E55F159-90DB-4BFF-A881-27D1773CF0FF.jpeg
 
Joined
May 19, 2017
Messages
71
Location
Missoula Montana
My daughter admiring the Awltech 3B engine mounts. This truck will get a Toyota 3B diesel with turbo. I plan to drive it without a turbo first just to see the difference myself.

3B79012F-678C-4A0C-82CF-C4E1D21C6C6E.jpeg
 

whitey45

SILVER Star
Joined
Oct 18, 2007
Messages
4,360
Location
San Gregorio
 
 
Great build, that 69 is far from a basket case!!! Did you already kill it! Nice og paint survivor!
 

todt

SILVER Star
Joined
Feb 7, 2008
Messages
530
Location
FL
 
 
Nice, I've been thinking about doing this to my 69 for years. I like the way my half cab turned out and has plenty of leg room. Just been hesitant to cut the frame.
 
Joined
May 19, 2017
Messages
71
Location
Missoula Montana
For the frame, I just made sure it was straight and square measuring from pre-determined points. Then, with the stretch I squared it up and tacked in place. I cant recall if I adjusted it any but it will move with the tac welds. For this job diagonals are your friend for sure.
I didnt get any good pictures of the frame along the long axis but the frame does go from tapering to straight through the splice. This is a good stretched 40 thread and he has some good pictures of how the frame stretch looks.
You could do a tube frame with a little more work too but I had a 40 frame and parts to do this build so I went that direction.
 
Joined
May 19, 2017
Messages
71
Location
Missoula Montana
A few pics from the spring over axle conversion. I rebuilt these with all new koyo bearings, seals, etc. Axles got 5.29’s and lockers front and rear. Lunch box locker in the rear. Air locker up front.

9B824D5F-DF1F-4D26-B6C8-7163B9189117.jpeg


41E98387-F580-4A08-932C-42ED0BF09941.jpeg


123399C6-490B-4702-88ED-AB1D79B9C048.jpeg
 
Joined
May 17, 2015
Messages
205
 
I am loving this build! It's good motivation for me. I need to think about axles, so I'm glad you posted all of this. It'll help me when I get to that point. Thanks!
 
Joined
May 19, 2017
Messages
71
Location
Missoula Montana
Glad you like the info. I struggled with the lift and gearing myself. I wanted to go low with no lift but didn’t want to cut body panels if I could avoid it. The gearing is pretty easy in the end analysis since we know tire size, target tom for sped and the old gearing. Might have to trim the bed since I plan to run 37’s by hoping to avoid it. The spring over is a lot of lift. About 5.5 inches.
 
Joined
May 17, 2015
Messages
205
 
Glad you like the info. I struggled with the lift and gearing myself. I wanted to go low with no lift but didn’t want to cut body panels if I could avoid it. The gearing is pretty easy in the end analysis since we know tire size, target tom for sped and the old gearing. Might have to trim the bed since I plan to run 37’s by hoping to avoid it. The spring over is a lot of lift. About 5.5 inches.

Good to know. I was wondering how much lift you get out of it. I may go this way as well and follow your lead.
 
Top Bottom