Hydramatic?

[DaemonForce]

I'm going to be driving an underpowered oversized piece of crap for the next few days until I can get this under control. Just curious, what were the ft/lb ratings of the TF904, TF727 and TH400?

[shaggimo]

No clue on the tf's, but the thm's names represented their torque capacities (or so it was claimed) IE: th350, 350 ftlbs, th400, 400 ftlbs (even though they will handle much more in factory form). Think of the old Buicks, Caddys, and Olds' with engines that put out close to 500+ ftlbs and weighed 4000+lbs, lol. One thing about the 400, it takes more power to turn,  and it has a bit higher geared first. Your eagle will be more sluggish and fuel defficient  than ever, lol, but as long as you set it up right and don't do neutral drops or any other torturous things, I'll doubt you'll ever break it.

[DaemonForce]

What is a neutral drop? O_o

[shaggimo]

Puttting the car in neutral revving up the engine, and dropping it in gear, worse yet reverse drops, 

[captspillane]

The TF727 and TH400 are both rated at 450 ft/lbs. I suggest you read the last two posts in this thread.

http://forums.amceaglenest.com/index.php?topic=26.0

[recomer]

The TH400 with AMC bellhousing had a unique tailshaft that only worked with the Borg Warner quadratrac transfer case.

Not exactly. The TH-400 was used from 1965 through 1979. From 1965 through 1972 it had an adapter between the TH-400 and Dana 20 transfer case. TH-400s from 1973 through 1979 had a unique bell housing to mate to the AMC engines, earlier versions used adapters.

[carnuck]

73 thru 79 were all BW QT but many till early '75 were still the nailhead trans with an adapter ring (my '73 and '74 were that way). Before that they were Dana 20 with a weak adapter.

[captspillane]

The weak "texas" shaped adaptor is readily available from Scouts. A Dana 20 and a Scout Dana 300 (completely different than the Jeep Dana 300) will bolt to the back of any TH400 with that adaptor, but it will still not work unless you change the output shaft. The Borg Warner output shaft doesn't work with a Dana 20 even with the adaptor.

As far as I know every AMC bellhousing TH400 was mated to a Borg Warner case. That's exactly what I stated before. Only the pre-73 TH400, which had an adaptor ring and non-AMC bellhousing, had the Dana 20 behind it. That fact still doesn't help you bolt on your Eagle transfer case. You need an adaptor kit and tailshaft to install it in an Eagle.

[captspillane]

I've noticed that you refer to your current transmission as a TF904. Only Iron Duke Eagles had a TF904 with Chevy bellhousing. All the automatic transmissions behind the 258 in Eagles were TF 998s.

If you are still looking to use a TH400 instead of a TF727, here is some more information.

The TF998 is 22-3/8" long.
The TF727 is 22-1/2" long.
The TH400 case is 24-3/8" long.
The Novak Adaptor is the thinnest available. Its 1.4" long, so the TH400 would come out to over 25-3/4" long.

At nearly 4 inches longer you will have driveshaft problems. You will also have clearence issues with the floor pan.

The Borg Warner 1339 transfer case used an extremly long 10 spline output shaft. The Dana 20 used a 32 spline shaft. The Dana 300 and all the New Process transfer cases used 23 spline. Advanced Adaptors only offers a 32 spline input shaft for the Dana300 and a 4-1/4" long adaptor. You must use the Novak system that has a different 23 spline output shaft with its adaptor. It costs 478 dollars.

Another reason to use the Novak adaptor is that the AMC TH400 has a bolt pattern clocked 4 degrees.  You'll have to play with the different clocking positions in the Novak adaptor to make it work.

[carnuck]

'71 to '73 nailhead TH400s with AMC adapter ring came with D20. 1/2 way through '73 QT became an option.

[DaemonForce]

I've noticed that you refer to your current transmission as a TF904. Only Iron Duke Eagles had a TF904 with Chevy bellhousing. All the automatic transmissions behind the 258 in Eagles were TF 998s.

Yes that's how they were made, no that's NOT the case with my car and that's entirely the problem with it. Yes I have a 258 motor, no I don't have a TF998 or I wouldn't be talking about this every few months. It's great in a Hornet but it's absolute crap in an Eagle. Do not want.

At nearly 4 inches longer you will have driveshaft problems. You will also have clearence issues with the floor pan.

I can manufacture my own driveshafts, that's no problem but I don't want to start cutting into the floorboard.
I've been digging around my trailer and I do have a workable transmission for this car but I don't have the time to set it up. I need a replacement automatic that can just bolt right up in the mean time. At this point I no longer care if I have to lose my 4WD. The truck I'm driving has a bigger tank than the Eagle and half of it is being used up daily. This car is never getting fixed.

[captspillane]

How did you come by a 4WD TF904 with AMC bellhousing? Did you splice a 2WD TF904 with a TF998 4WD adaptor?

A 2WD TF727 is pretty easy to come by. There is one for sale here in PA for $250. There is also a 2WD TF998 from a Concord for sale for $100. A 727 from a FSJ is even more common and plentiful. I can buy 5 or 6 of them from one junkyard near me for $120 each.

You can drive the car with a 2WD transmission just fine with your front driveshaft removed. You can also remove your front axle if you dissemble two old CV shafts and use the old ends to bolt your front wheel bearings together.

Good luck getting it back together.

[DaemonForce]

How did you come by a 4WD TF904 with AMC bellhousing? Did you splice a 2WD TF904 with a TF998 4WD adaptor?

The previous owners were a bit more resourceful than the average mechanic. I would have to ask them about it but most of them are either dead or dying at this point and can't be disturbed. Good thing too, the sight of this transmission would probably kill them...

A 2WD TF727 is pretty easy to come by. There is one for sale here in PA for $250. There is also a 2WD TF998 from a Concord for sale for $100. A 727 from a FSJ is even more common and plentiful. I can buy 5 or 6 of them from one junkyard near me for $120 each.

I would go for it too. The issue here is the fact that I can't get to the picking yards to pull parts anymore. Portland is the sure bet for finding a TF727 whether it be 2WD or 4WD but my temporary driver isn't made for distance trips and that too is falling apart at this point. Everything in this place is crap and I can't even get a rental car. This town is a black hole.

You can drive the car with a 2WD transmission just fine with your front driveshaft removed.

Yeah that's what I was thinking. No viscous coupler, no problem. Still gotta find a new core though. I'll have time to figure this out over the weekend and I might be able to finally do something if I can leave early tomorrow.

[carnuck]

Too bad I'm not heading down or I'd bring the 998 I have (both 2wd and 4wd in my for sale collection) The AMC pattern 904 was common on 6 cyl cars from '72 to '77.