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post #1 of (permalink) Old 09-19-2002, 12:30 PM Thread Starter
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What to use from a J truck?

I can get whatever parts I want from 3 J-10 trucks and 1 J-20. I can't sell anything from them. I need to know what parts I could use from them on my cj-8.

They have amc motors so I'll assume the trannies (3 manuals and one auto) will bolt up to my 258. Any idea what trannies these are? What gear ratios?

What transfer cases came in these trucks? Will my dana 300 bolt to any of the trannies?

What axles did these trucks come with? I'm fairly sure the fronts are dana 44s. I've heard of two choices for the J-10 rears, dana 44 or amc 20HD. Is that right? What makes the amc 20HD a HD? What is the axle width? The j-10s have 5 lugs, the j-20 has 8 lugs. I think the j-20 has a dana 60 rear and dana 44 front? Would it's dana 44 be any stronger than one from a j-10?
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post #2 of (permalink) Old 09-19-2002, 03:11 PM
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Re: What to use from a J truck?

The J20's have a HD44 and D60. the 8 lug setups on the 44's are a little beefier than the J10's ...

the 5 lug 44's are 19 spline shafts are 1/2 ton and the HD44 is rated at 3/4 ton with 30 spline shafts... better choice there.

The gears can range from 4.11's to 3.54's if not higher. If it were me... take the J20 axles and the manual tranny (should have a D20 behind it)... though I like the TH400/D20 combo.... you most like would find a TH400/QT in there with the auto trans unless it's older than 74
post #3 of (permalink) Old 09-19-2002, 11:51 PM Thread Starter
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Re: What to use from a J truck?

I prefer the lower gears of my dana 300. 2.61 vs 2.00 in a dana 20. Would the dana 300 bolt to any other trannies from these trucks?
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post #4 of (permalink) Old 09-20-2002, 10:24 AM
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Re: What to use from a J truck?

Yeah with the proper adapter... I agree that the lower gears is the way to go...
post #5 of (permalink) Old 10-11-2002, 11:53 PM
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Re: What to use from a J truck?

The manual transmission is a T-18, you didn't mention if your rig is manual... if not you'll need a pedal assembly and clutch linkage.... plus it may require you to move your drive train back about 4" I believe (if you are lifting your rig that helps with the front driveline angle).
Take some measurements from the rear of the engine block to the output shaft on your rig and the trucks.
post #6 of (permalink) Old 11-12-2002, 11:23 PM Thread Starter
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Re: What to use from a J truck?

Is the J-20 front a pass drop diff? Is the rear diff centered or how close?
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