Info and questions on 74 J-10

[LJ93Z28GM]

Well this J-10 has been passed around between me and my other pals for a bit and i currently am playing with it a bit.

I have some questions, how rare is a 74 J-10 seems to be a short bed if there was such an option. It has a 360 in it with a 3/4 rv cam. Headers, 750 dp holley, headman headers, edelbrock intake and a few other things.

What axles were stock front and back. Other pal said it has 4.11's in it now but are they both dana 44's?

How strong is the transfercase, it has the low gear option.

It has a th00 trans with shift kit.

I am supposed to finish up the truck and sell it so i am just looking for info on it.

The whole truck driveline has less then 20K on it and the suspension was redone as well. Paint is two or three years old. It is showing weakness in some spots in the bed, normal i assume.

This truck is a blast to drive, loud and fast up to about 50.

One last question it shifts out of first at 4K rpm that seems a bit low to me or is that the redline on a 360?

If anyone is interested in the truck email me. He is looking to get 3800 for it or so. I live in IL.

[chadlow]

WHERE ARE YOU AT IN ILLINOIS?

[LJ93Z28GM]

Northwest burbs of chicago, arlington heights.

[joe]

<BLOCKQUOTE>quote:</font><HR>Originally posted by LJ93Z28GM:
I have some questions, how rare is a 74 J-10 seems to be a short bed if there was such an option.
<HR></BLOCKQUOTE>
It came in either 119" wheelbase or 131" WB.

<BLOCKQUOTE>quote:</font><HR>What axles were stock front and back. Other pal said it has 4.11's in it now but are they both dana 44's?
<HR></BLOCKQUOTE>
D44's front/rear. Factory ratios were either 3.54 or optional 4.09's.
<BLOCKQUOTE>quote:</font><HR>
How strong is the transfercase, it has the low gear option.
<HR></BLOCKQUOTE>
If it's in good shape after 27 years(?) it's tough x-case(BW/QT). IMHO the strongest full-time x-case ever used in Jeeps but again it's 27 years old so YMMV?
<BLOCKQUOTE>quote:</font><HR>
One last question it shifts out of first at 4K rpm that seems a bit low to me or is that the redline on a 360?
<HR></BLOCKQUOTE>
Actually that seems way high an rpm to be shifting out of 1st gear. Might be related to the shift kit that was installed or the vac modulator is out of whack?
[/QB][/QUOTE][/QB][/QUOTE]

[jeepbob]

The q/trac is strong enough to handle the duties, just make sure the chain is in good shape. The T400 tranny is programmed to shift at a maximum of 5000 rpm no matter what engine is in front of it. The 4000 rpm point is not bad but if you want more adjust the vac modulater. You may get the the 5000 rpm shift point. Just remember that the 68 lb rotating mass of a t400 is scary if it comes unglued.

[LJ93Z28GM]

Thanks for the help, well maybe it has the 4.09 gears in it instead of the 4.11's.

The transfercase was rebuilt so it is not riding on 27 year old parts luckly.

Where is the vac modulator for changing the shift points. Will the 360 be able to run that high of an rpm. My guess is it should since it is a sb, but i could be wrong.

My other new questions are what does the lockout switch enable and how good is the low gear option. Does it help that much. What is a safe speed to travel at in that gear. Also do you have to be at a complete stop to enable those devices?

[joe]

<BLOCKQUOTE>quote:</font><HR>Originally posted by LJ93Z28GM:
My other new questions are what does the lockout switch enable and how good is the low gear option. <HR></BLOCKQUOTE>The vac switch in the glove box(called E-Drive for emergency) locks out the clutch cones and allows power to both axles at the same time. It's recommended when you're sure to be spinning tires etc so excessive tire spin doesn't wear on the clutch cones kicking the front axle in and out. In this mode you must be on a loose traction surface but to switch it via the knob you can be at about any speed(if the surface is loose). The Low range in the BW/QT is good offroad. It's a 2.6:1 ratio compared to a D20's 2.0:1 so it's as good as most and better than some. Run it in LO and see the difference for yourself smile.gif You'll need to be in E-drive to engage LO and then be rolling a few mph's(-5mph) and drop the trans in neutral and pull "firmly" into LO range w/o hesitating in neutral on the x-case then drop trans back into gear. Same to get out of LO back into HI but the book recommends a bit higher speeds(5-10) but go with whatever works for you. If the system is old you may need to shut the motor down to shift between H/L w/o grinding and then restart it.
<BLOCKQUOTE>quote:</font><HR>
What is a safe speed to travel at in that gear<HR></BLOCKQUOTE>

Listen to your motor it'll tell you cause the rpms will be screaming if you drive at any road speed at all. It's for "lotsa torque" low speed crawling. LO range is also only for slick traction surfaces, your tires need to be able to break traction and spin occasionally to release the binding in the drive train.