Eagle Automatic Transmission

[Krash2Powder]

Thanks A Ton Mudkicker!! I Been Needin A Way To Get My Baby Runnin Again... It Just Looks So Sad Sittin In The Garage With It's Guts Tore Out Right Now...

[madbunny]

pretty sure the TH400 only came behind the 401's
had a 76 cherokee chief 401 TH400 quadratrac.

i think the "smaller" eights got the 727 torque comands.

although my FSJ lore is becoming rusty...

[Pack Rat]

71 to 79 on the 400 with Quad, used behind all engines. 80 up on the 727 although they did use the 999 on the 258. If I had a choice between a 998,999 or 727, it'd be a beefed up 727, almost as good as a stock GM 400  .

[wagonmaster]

im a fsj man and i have a few of them. my question is will the trans from one of my parts trucks fir into the eagle. i know this has been touched on but before i buy an eagle that i have my eye on i wanted a definite. al of my trucks are 80s models with 360s.  im not trans savvy and im looking for a cheaper way to fix this otherwise good car. sorry if im beating this point.

[Pack Rat]

Yes on the 727, same bolt pattern and the Eagle transfer case will bolt on too.

[wagonmaster]

so this can be swapped in with no modification? i just want to be clear on anything i may need before i move forward. thanks

[IowaEagle]

Yes, direct swap, only have to reposition the filler tube a bit from what I hear.

[jepstr67]

I hate to start a new thread for one quick question so here it is. How do I replace the detent spring so the shift lever won't just float from Park to L1 without resistance? (81 SX4 4banger auto)

[Pack Rat]

There's two places where your problem could be, either in the shifter itself which would be my guess or inside the transmission which is far more unlikely.
I'd check the ramp where the detent pin rests between drive and second or the detent pin itself to make sure it is releasing all the way and riding on the bottom of the ramp.



The second option is inside the transmission, but I very much doubt that's where the problem is.

[jepstr67]

Thanks for the quick reply.

The shifter handle it self is just fine. It is the only thing that keeps the transmission in aproximately the right gear. It is the spring in the tranny.

Is it something I can get at just by removing the pan and filter or is it more involved?

[Pack Rat]

You'd need to drop the valve body to get at the detent ball and spring. I'd really check the shifter very closely, once the detent pin drops into the notch on the ramp it's basically locked in place. Even if the detent ball was totally not there it would still stay in drive and not slip down into second. Just because the handle is fine doesn't mean the rest of the shifter is.

[Whuntmore]

I've also read thru this post, and I'm not sure about a few things:

the 998, 999 and the 727 will all fit on a SX/4 258 I6??  Just bolt 'em on, and away we go?

Someone also posted the bells are all the same?  Well, let's say I have an SX/4 with a 998 tranny.  Can you have it rebuilt with 727 parts?  Is something like that possible, or do you just go out and scrounge for a 727?  What if you can't find a 727 and you're stuck rebuilding the bell you've got?   Can you turn a 998 or a 999 tranny into a 727? 

Am I babbling again??

[IowaEagle]

Many of the rebuild kits are for the 727 & 9XX transmissions in that many of the parts are the same.  All will fit your AMC engine as long as the engine is an I-6 built from '72 on or any Gen I, Gen II, or Gen III AMC V8 and the transmission is for an AMC engine.

[86wagon]

ok so i need to get the laymens walk thru the adjustment of the throttle rod.....my bird has a webber on it .....i'm wondering acouple things should i push throttle link all the way down and adjust or adjust by pulling throttle rod forward and then adjust and to what position and with all said and done should i have a spring pulling it to rest in the forward position???

[captspillane]

pretty sure the TH400 only came behind the 401's
had a 76 cherokee chief 401 TH400 quadratrac.

i think the "smaller" eights got the 727 torque comands.

although my FSJ lore is becoming rusty...

The TH400 and TF727 are both officially rated at 450 ft/lbs. Today there are more 401 V8s in front of TF727’s than TH400s because the TF727 has many more axle and transfer case options. To make your Jeep off road capable the first step is to eliminate the TH400.

The only reason the GM TH400 ended up in AMC vehicles was because it was the only transmission that worked with the Borg Warner quadratrac transfer case. This was the first full time transfer case with viscous coupling and AMC always wanted to be ahead of the curve. AMC put quite a few TH400s in full size Jeeps, and they also put a few of them in CJ7s in 1977 to 1979. Some of those CJ7s were 304s, but most of them were 258s. These Jeeps do not have locking hubs, they are actually full time 4WD. Most of them did not have low range. The low range was a big hump added to the back of the transfer case as an option. The rear axle behind a TH400 is not centered because the driveshaft is offset to the passenger side to make room for the optional low range assembly. The first time I looked underneath my 1978 CJ7 I was totally confused. Its a very strange transfer case.

The TH400 is not an option for an AMC Eagle. Its output shaft is hideously long and the bolt pattern is bizarre. It’s not easily adapted to Jeep transfer cases because the adaptor is either very long or the transmission has to be taken apart to put in a shorter tailshaft. The only good thing about the TH400 is that it has an electric switch at the end of the dropdown cable. Thats what I call the linkage that goes from your carb throttle body to the transmission to let it know when to downshift under load. Some FSJs had an electric switch underneath the gas pedal and didn’t use a dropdown cable at all. That would eliminate the cable and simplify some carb and engine swaps. The quadratrac transfer case cannot work with an Eagle because both the front and rear driveshafts are on the passenger side. The only rear axles with an offset differential are the weak and narrow CJ7 axles or the super wide FSJ axles.