16th4k

I got a 5ksq trans (016 AGD) from a local very reputable supplier, and it's for a swap into my 87 4kcsq. I'm looking for fewer revs at "highway speeds"

Something about the trans has me stumped: when I put my current trans in gear and spin the input shaft, the front axle flanges turn as well as the rear prop shaft flange. When I try this with the AGD, I can't get the front flanges to turn unless I engage the diff lock. Does this one have a different type of diff than my 4kcsq? Or is this trans no good? I need an answer QUICKLY!!! as my trans is OUT right now and I am driving the Suburban dino-juice hog and my wife's patience is still intact - for now.

If you can help shed some light here, please email me directly.

Thanks,
-Dan

dwengi

The 016 AGD has 2 open differentials so it is basically the same design as your 4K trans. Seems like what you are describing can be caused by the front differential portion having more resistance than the rear drive portion. i.e open differntial power flows to path of least resistance.

Try this. Turn the input shaft while preventing the rear prop shaft flange from rotating. One or both of the front flanges should turn backwards. If they don't something is wrong with the center differential.

Katman

Or is the 'final drive' ratio in the 016 AGD the same as in the 4kcsq, with just better gear ratios?

In your new gearbox, as ther is no 'load' on it, (and the center diff is 'open', whatever is easiest to turn will turn when you apply rotation to the input.

As mentioned, hold the rear output from turning, and (maybe only one of) the front shafts shoudl turn.

Conversly, if you stop both the front drive flanges from turning, the rear output shold turn.

What you see is normal. Without the trans in the car, the 'easiest to move' output of the gearbox will move, and the rest stand still because of the slight internal friction.