Tranny and diff types? Help

[PRSgodzilla]

I bought a parts car a few years back intending to use the 5 speed and diff out of it. Now that I finally am getting around to the swap, I dont know the years of the tranny and diff or the gearing of the diff. How can I find this out? Is there a number somewhere on the parts I can look at?

[beandip]

there are numbers stamped on the ring gear . Or you can hold one Axel companion flange still and rotate the other one . Count the revolutions of the drive shaft flange. Mark the flanges first. One full rotation of a Axel flange and the drive shaft turns 3.9 revolutions this is the ratio. Others can tell you how to identify the tyranny's. I cannot help you there. Gary

[PRSgodzilla]

Thanks Gary, I'll have to take a look. Anyone else on the tranny? I think they're both out of a 78 zx, is there anything I can look for to tell?

[beandip]

The '77-'80 is a 280 A and the '81-'83 is a 280B The B is a closer ratio unit.

[Carl Beck]

The different transmission styles are shown on the <a href=http://zhome.com/ZCMnL/tech/69-83TrannyShifterDrawing.jpg TARGET=NEW> Z Car Home Page</a>

Note the Top Cover Plate on the 72-79 four and five speeds, there is none on the 80-83's

<a href=http://zhome.com/ZCMnL/tech/GearRatios.html TARGET=NEW>Transmission and Rear End gearing </a> is listed there also.

FWIW,

Carl B.

[PRSgodzilla]

Thanks alot guys, I'll get back to you if I need anything else.

[sblake01]

Also, I've noticed that the 77-79 5 speeds have two mounting ears on the bottom of the tail housing for exhaust clamps and the 80-83 (84 if you count the RWD Maxima) only have one on the left side.

[Maddos]

What about this issue?

What's the deal with these moustach bars. The one with flogged out rubbers (blue) is from my late 74 260 2+2. The other is from my parts car and was going to be swapped in as rubbers are ok. As you can see different bends plus mounting holes on diff were different sizes, thought this was the worst problem but now this. The moustach bar I removed with bad rubbers ran behind the bracket which holds the rear suspension up also. The parts car ran in front. Checked my other cars and all seem to run in front.

This is a pic of the diff in my blue car.

This is the diff I removed from the parts car.

Is this a totally different diff or something because I thought if they were 180 or 200 all you had to do was reverse bar.

Need help, do I just order some new rubbers for other bar?

[Carl Beck]

Your 74 260 has an R180 rear-end

Your Parts car has an R200 rear-end

The R200 is larger and has larger mounting bolts, so the holes in the mustache bar are larger.

You order new rubbers for your 74 if you want to keep the R180.