Fj62 Diesel Conversion

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dave george

Joined
Mar 30, 2005
Threads
7
Messages
52
Location
medford,oregon
I installed a 6bt Cummins diesel in my FJ62 and it turned out great. Problem is I'm gear bound. Have plenty of power so looking for possibly a 2 speed rear diff. I heard there is one made in Australia that's about the same size as a chev
12 bolt. Anyone heard of this and have an idea on how to get my hands on one? Email me at withamtrucks@qwest.net, Thanks
 
We need some more specs on your setup to offer suggestions.

As far as 2 speed axles, I've never heard of them in anything less than heavy duty trucks, and they are HUGE.
 
I believe the model A had 2 speed axles ;)
 
I used the toyo auto trans and still has stock axles. Has been running for over a year and seems to hold up ok. Just trying to get better highway speed and economy, when I keep the rpm down I get close to 30mpg but am turning about 2300 rpm to do 55, would like to get down around 16 to 1700 rpm.
 
bigger tires or lower numerical gear ratio..

you got 3.70's in it right now?
 
Unless you've changed them, you have a 4.10 gear ratio in your axles.
It's easy to swap third members with any '79-83 FJ40/Fj55s and all FJ60's.

You will probably be able to find someone that wants to cut an even trade.
 
dave george said:
I used the toyo auto trans and still has stock axles. Has been running for over a year and seems to hold up ok. Just trying to get better highway speed and economy, when I keep the rpm down I get close to 30mpg but am turning about 2300 rpm to do 55, would like to get down around 16 to 1700 rpm.
Click to expand...


How did you adapt the trans to the Toy auto? According to this (http://www.csgnetwork.com/multirpmcalc.html) RPM calculator if your running 4.11 gears, 30" tires, and a .75 OD you should be running 1900 rpm's @ 55 mph. Are you sure your trans is shifting into OD? or are you running 25" tires?

A swap to 3.73's will lower your RPM's by 10%. post up some pics, I'd love to see your conversion.
 
That is an amazing conversion. That is exactly what I wish to do one day, except with a 60. Do you have pictures or knowledge from the conversion process?
 
I used a dodge aluminum manual trans housing, since the toyo trans had a bolt on bell housing, I bored the trans face out, made a plate that matched the toyo housing, welded it into the dodge housing. Had to calculate depth so torque converter was in correct position. I have pictures on completed (so far) project but dont know how to attach to this site. Give me your email address and Ill forward to you
 
Here's his description & pics:

"Here are some pictures of conversion, it's kinda hard to get a real good picture of the suspension add on, I have different wheels and tires on it now and gives me a couple more inches of clearance. The trans adapter I made was out of a dodge manual trans bell housing. The toyo trans has a bolt on bell housing so I removed it, got the dodge housing, bored it out where it bolts to trans, made a plate that fit the toyo trans, calculated the depth it would have to be from the flywheel to the trans and welded the plate into the dodge housing. Then bolted the dodge housing to the toyo trans, made a flywheel adapter to bolt the toyo converter to the dodge flywheel and dropped it in. I made new front motor mounts and welded in, reused rear trans mounts so had no driveline modification to do. Was able to put rad in origional position as engine was only a couple inches longer than the 3fe. Had to modify my heater core outlets and move them over because they hit the cummins exhaust manifold, converted the toyo ac hoses to fit dodge ac compressor so was able to use dodge compressor so no modification there. Had to modify right front A frame front crossmember to get rad hoses on. Had the inlet and outlet on my rad changed from side to side so hose would couple up easier. It was/is a fun project. I also put propane fuel injection on the engine which gives me better fuel economy and power. Without the propane I get around 18mpg, with I get around 28, just have to be careful due to extra power."
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dave can you go into more detail about the bushings between the frame and axle, those look like simple rubber bump stops? Is this what the front suspension rests on?
 
I use a Freitliner cab air bag, they are approx 3" in diameter and 6 to 9" tall. Welded a piece of channel iron in where the spring stop was made a flat iron bracket for top where rubber stop was, used a suspension air compressor out of an older Cadillac with a pressure switch to shut the conpressor off when it gets to the height I wanted. Took 50 psi to bring it up to an acceptable clearance.
 
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