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Check with aghumvee I purchased some NOS doors from him and I am very happy with the quality and price, there were some small imperfections (small brown spots) in the windows but it is hardly noticeable and of course this was discussed beforehand, He is a good guy!!!
IIRC the 765 is just a heavy duty 700R4, for simplicity sake I will call them 4L60 which is one of the designations used for the 700R4
They are both mechanical with a throttle cable.
It takes a $500 (pre covid price) output shaft and adapter to use in the HMMWV as the 4L60 is a lighter duty...
In any case you should be able to shift into a gear with no synchronizers or working synchronizers while stationary as after short time the input shaft should stop and would not grind any gear, the fact that you grind the third gear while stationary shows you have a clutch that is not working...
Actually third having the synchronizers "burned out" may make perfect sense, I have no knowledge of the U99 but if it is like the 404 you would normally start out in third as 1-2 are low range, so over time as the previous owner drove it with a defective clutch they would naturally burn out the...
Third likely has poor or non working synchronizers You may be able to detect the very slight pulling down of the RPMs when stationary and going into gears that "work" that is the synchronizers stopping the clutch (transmission input shaft) that is not fully disengaging. the exorcise listed in...
Here is one thing to try, start the truck in 3rd gear, clutch depressed, then slip it into neutral and then see if you can slip it back into third gear keeping the clutch depressed the entire time.
The cooling issues are very unique to the HMMWV, it was designed for low speed operation, the factory fan moves allot more air than any electric fan/s that are available.
That hole in the hood is a big issue with me, we learned back in the 60s (and maybe actually earlier) that a hood scoop...
Specs say 90HP IIRC (and that is more doubtful by the decade) the original 2.2L had 86HP
I had one I put a 280S engine in and it moved pretty well, I would stick a Mighty Mite in the bed and tow a small pop up to the various Jeep jamborees, back in the day.
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