Howmuch is too much?

Gibby1 · Sep 15, 2006

OK, putting the 45MB together. I have a set of Dana 44s, locked F/R with detroits, the front diff is a passenger side drop and the rear is a HP in the middle.

After I put the engine back in, I realized that the tcase is significantly off to the passenger side in the rear, not like the Toy or Chevy that I was used to. So, I can get my pinion angle nice as I've not welded on the perches yet, I just have everything sitting in place.

I have 28" from the tcase yoke to the diff yoke and 5" of lateral displacement. This is going to be primarily a trail rig but it's going to be too much fun to not drive it for short trips around town as well so I want it to be street worthy. Is the 5" of lateral displacement TOO much on that short driveline or Can I go get a high travel driveline of sorts that can handle that much? I know 5" of vertical displacement is not too bad, just wondering if the lateral displacement will cause a problem?

Any thoughts here before I make things permanent?

Bunk1 · Sep 16, 2006

Gibby said:
Any thoughts here before I make things permanent?

How about a pic.

CrustyJeep · Sep 16, 2006

I'll measure mine tomorrow, but that sounds *roughly* like what I've got, and it's fine. There might be a little vibe on the highway, but it's hard to tell. Around town, nothing, not a thing.

Gibby1 · Sep 16, 2006

I'll see if I can put up a pic tomorrow. Have to go steal my wife's camera.

I don't have a driveline to fit in there yet but I might be able to stick the stock one somewhat in place just to look at the alignment.

pokey · Sep 16, 2006

what transfer case?

Gibby1 · Sep 16, 2006

pokey said:
what transfer case?

Not sure... IIRC it's the stock transfer case that came with the 45MB. I put a Buick 231 in it.

The transmission was apparently updated but I think the stock transfer case is still in place. A Borg Warner overdrive included with the rig when I got it.

I'm not really Jeep/Willy's familiar, T18 to a T90 sounds familiar.

Gibby1 · Sep 16, 2006

Hey Jaydog, you know more of the history in this thing. Do you know what transmission t-case combo is in this?

Freeride · Sep 16, 2006

Would that be a Spicer 18 t-case?

pokey · Sep 16, 2006

you could then change to a model 20 transfer case and maybe solve your problem. downside would be losing the OD

Gibby1 · Sep 16, 2006

pics

From the back.

From the side.

CrustyJeep · Sep 16, 2006

Wow that's way more off than mine, and it's vertically way out of phase too.

Technically, side to side offset with single U-joints at both ends, in and of itself, shouldn't be a problem...

Gibby1 · Sep 16, 2006

Way out of phase? BTW, that is just a temp drive shaft I had around, that I clamped on one end and just having it sitting on some bolts in the front flange. That's not the real driveline.

skrause · Sep 16, 2006

Gibby said:
Way out of phase? BTW, that is just a temp drive shaft I had around, that I clamped on one end and just having it sitting on some bolts in the front flange. That's not the real driveline.

It's not out of phase, but the angles are off. You need to either drop the pinion down so it's at the same angle as the t-case output or raise it a tad and run a double cardan at the top instead of that single.

Gibby1 · Sep 16, 2006

Hmmm, not sure I buy that. I have the pinion pointed direction at the t-case output just like I have in my 4Runner.

Crash says, "A shot of the front driveline installed. I think I'll take the boot off. It only has about 1/2 the travel of the driveline, which is a 10" travel. The upper joints are 1 ton CV joints and lowers are the 1350s. Check out the nice angle at the pinion - almost dead on straight."

Not as good a shot as the front but the rear is again sitting at 0 degree pinion angle.

I'll be using similar drivelines on this rig.

notstock · Sep 16, 2006

Since you have the Cardan joint you should be O.K. Gibby. That would have been my suggestion. Grease that thing religiously, mine seems to need it once a month. I also drive it 110 miles a day, 7 days a week.

Jaydog · Sep 16, 2006

Gibby said:
Hey Jaydog, you know more of the history in this thing. Do you know what transmission t-case combo is in this?

The transmission is a T-90 and the transfercase is either a Dana 18 or 20, I believe it is the 18 though, and it has a warn overdrive.

Jaydog · Sep 16, 2006

Now for my 2 cents, I agree that with a Cardan Joint at the transfer case it should be ok, I would just make sure you have a little extra travel on the drive line, Correct me if I am wrong, but if you droop the left rear tire, it will extent the drive line as well since the angle is that way.

Gibby1 · Sep 16, 2006

Since the diff is centered, dropping one side or the other shouldn't extend the
driveline.

Only both sides dropping will cause the driveline to extend futher.

CrustyJeep · Sep 16, 2006

Gibby said:
Way out of phase? BTW, that is just a temp drive shaft I had around, that I clamped on one end and just having it sitting on some bolts in the front flange. That's not the real driveline.

Oh NOW you tell us :flipoff:

And BTW, yeah, I didn't mean "out of phase", just the angles don't match, got my terminology mixed up :redneck:

So if'n you're gonna use a CV at the t-case, then you want close to 0* at the axle. You're WAY off horizontally, I'd expect quite a bit of vibes out of that.