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View Poll Results: Automatic transmission preference?
TH400 56 47.46%
TF727 62 52.54%
Voters: 118. You may not vote on this poll

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Old 05-20-2009, 03:16 PM
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Dirt Wag Dirt Wag is offline
Grease Monkey
Join Date: Jun 24, 2008
Location: Lehigh Acres, FL, USA
Posts: 358
I have no experience with the TH400 but I can vouch for the toughness of the 727. I got muddy water in mine twice and the second time it stopped working completely (like I was in neutral) and fluid/steam came out of the vent hole. When it cooled down some I put a quart of fluid in and it worked again. I got on the interstate and drove 10 miles at 70 MPH and it quit again. Same procedure, drove 10 more miles, quit again. Same procedure and got home. The fluid looked like a strawberry milkshake. I cleaned the mud out of the pan, flushed it, and put in a new filter and it's been working fine ever since.
1985 GW, 360, 727, NP229, D44, AMC20, HEI, SOA/shackle flip 7" lift, Quick Lok locker rear, Aussie Locker front, 4.10 gears, 37 X 13.5 Interco SS-M16's, Warn Premium hubs, Tuff Stuff 12,000 LB winch, rear disc brakes === stripped down street legal off road toy
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Old 08-19-2009, 08:25 PM
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PlasticBoob PlasticBoob is offline
All Makes Combined
Join Date: Jun 30, 2003
Location: Long Beach, CA
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I'd put my money on the TH400 any day.
1974 Cherokee S, fuel injected 401, Trans-am Red, Aussie locker 'out back'
Click for video
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Old 08-19-2009, 08:28 PM
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710 Burner 710 Burner is offline
Join Date: Jul 30, 2003
Location: Normal, Oklahoma
Posts: 8,684
And this thread is back from the dead...just like an auto transmission.
Mark B. Jones

Originally Posted by GrandWag&Prix
Actually, now that I think about it, that could be either awesome or really terrible.

'79 Cherokee Chief "Junaluska"
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Old 08-19-2009, 08:45 PM
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Bobbo Bobbo is offline
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Join Date: Sep 11, 2003
Location: Bismarck, N.D. 58504
Posts: 1,229
I vote TH400. Like stated above, very common for all types of high power motorsports. In my FSJ life, I have never had a bad TH400, (i have had 4 in FSJ's) I have had 3 TF727 in FSJ's, and I bought 2 of them with blown out trannies. The 1 I bought that was running with the 727 was fine when I had it though. But I will say that NONE of the TH400 that I have had EVER gave up. I would not shy away from either or, but if you are going to swap t-cases its cheaper/easier to go the 727 route, if you are going to use a factory case. (like replacing a 229/228 with a 208, that is a cake swap) I had a hard time finding the TH400/D20 combo that will require a lot of work to swap in my QT vehicle. (thats why its not done)
78 Cherokee WT with a 4" BJ's system 401/TH400/half of a QT and 35/13.50-15 Toyo MTs
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Old 08-19-2009, 09:31 PM
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rebeljeep rebeljeep is offline
Join Date: Sep 25, 2003
Location: Millers Tavern Va
Posts: 81
I voted for TF727....because its whats in mine : )

Seriously, both are good trannies-plenty of aftermarket potential. having had a 79 th400 that had to be rebuilt, and building my 727, both have their quarks but have provided reliable service. The trannie shop I worked at approved of both, but now some of the overdrive trannies were a different story....
Jared Jeepin 4 JC

1984 Jeep J10 360, transgo/cummins internals/lockup 727, 208 gone through
35" Maxxis Buckshot
6" BJ's lift, Rear Dozer II, weekend warrior
Working swapped in Air Conditioning

1999 Jeep Cherokee Sport 4.0/Aw4/np231
all stock 245k + and counting miles, daily driver
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Old 08-19-2009, 09:44 PM
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rustyolred rustyolred is offline
Join Date: Jul 17, 2009
Location: Denton, NC
Posts: 24
I chose TH400 because of more availablity, but like the 727 cause of the t-case possibility.
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Old 08-20-2009, 03:52 AM
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pineymike pineymike is offline
327 Rambler
Join Date: Feb 22, 2008
Location: south jersey
Posts: 507
I just read all thease replys and I don't think anybody mentioned that early FSJ owners manuls said that in the event of lost brakes you could use reverse! I've beat on both with good results,only blewup 1 th400 turning 42's with 3:07 gears&nitrous in the comp mud bog! at the time it was also my DD so we towed it home droped it out sunday nite monday I took it back to the shop that built it monday, the guy said it was his mistake&fixed it no charge!!! put it back in monday nite drove it to work on tue.
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Old 08-20-2009, 10:47 AM
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Eugene 1 Eugene 1 is offline
Bleedin' Gasoline
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Location: La Crosse,Wisconsin ,Wichita ks, Oklahoma City
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2005 Ram 1500 HemI
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Old 08-20-2009, 10:30 PM
JeepMods JeepMods is offline
Gear Head
Join Date: Jul 08, 2009
Location: Norfolk
Posts: 559
I'll take a TH400...
Just wondering, What is the weight difference between the two?
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Old 08-21-2009, 06:26 AM
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The PIG Smith The PIG Smith is offline
King Browless
Join Date: Nov 30, 2001
Location: Fort Wayne, Indiana
Posts: 6,534
IMHO, if the membership was polled, I would venture to guess that those that mostly own rigs with TH400, tend to like the TH400 better.
Those with rigs with 727, tend to like the 727 better.

It has been demonstrated several times that both are equal.

Now the opinions that would have any real meaning would be those that are from owners that own rigs of both TH400 and 727 and equal experience with them.
Bryan Smith
2005 Grand Cherokee Limited - HEMI! Current Daily Driver
1982 J10: Stalled Project.
1981 J20: Commercial flat bed. Lost in Divorce
1987 J20 Pioneer: Former 'Ricbee' plow rig. RUST!!

Originally Posted by Jayrodoh
...but if it works, I wouldn't touch it.
Originally Posted by Lindel
Best laid plans, yada yada yada...

Last edited by The PIG Smith : 06-16-2010 at 07:32 PM.
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Old 08-24-2009, 07:13 AM
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srobertsfsj srobertsfsj is offline
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I didn't vote because I only have experience with the TH400 in my '74. That said, other than the mystery leak that I cannot find for the life of me, it's been a great tranny. I've beat the heck out it over the years and its the stock tranny with no rebuild. I have an 86 waggy with the 727 but I have yet to drive it because the engine needs replaced. Once I get it running I will be able to give feedback on it.
Scott R.

'86 Grand Wagoneer Super Chief 360 / TBI / WT conversion / 35x12.5x16 BFG Mud-Terrains (Project Link) /

"After years of being paranoid about my Jeep’s temp going towards that 220F mark, I’m realizing that if it was real problem, Jeep engineers would have painted that area RED." - FSJ Guy

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Old 08-24-2009, 08:23 PM
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j20brett j20brett is offline
360 AMC
Join Date: Jul 05, 2006
Location: Katy, Texas
Posts: 2,963
I would burn the fluid in my 727 weekly before i had it rebuilt. Figured the clutches were toast. Ristow pulled it apart and showed very little wear to clutches...torwue convertor was shot. Ran and shifted like a champ even after being thoroughly overheated multiple times. Proves to me it is one tough trans.
Kaiser - 1981 J20 115" WB - 5.3l/4l60E/np241c/3-link hp60 spooled/Leafs 14-bolt detroit/5.13's/40's

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Fight Crime...Shoot Back.

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Old 08-30-2009, 07:25 AM
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fulsizjeep fulsizjeep is offline
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Join Date: Aug 21, 2002
Location: Jubilee Jeeps.SWCO
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Originally Posted by The PIG Smith
IMHO, if the membership was polled, I would venture to guess that those that mostly own rigs with TH400, tend to like the TH400 better.
Those with rigs with 727, tend to like the 727 better.

It has been demonstrated several times that both are equal.

Now the opinions the would have any real meaning would be those that are from owners that own rigs of both TH400 and 727 and equal experience with them.
Originally Posted by fulsizjeep
I have years of driving experience with both of them and for the best of each breed, they are both CRAP. You asked for it.
Ran when parked.
88 GW, 401/727/208, 5" lift, D44s/4.10s/locked up, 35s with a few Evil Twin & TT's Fabworks mods
76 401 Wag, 77 401 Wag, 77 401 J20
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Old 12-23-2009, 09:51 PM
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timmy401 timmy401 is offline
Join Date: Jan 15, 2007
Location: Grandville, MI
Posts: 65
400 or 727?

I've got the early th400 w/ the factory adapter(nailhead bell housing, I was told?) in my 73 Waggy. The olny problem I had with it is when the modulator started leaking into vacuum line. I put in 2 used ones from core transmissions I had, both started leaking within a weeks use. To change to the GM modulator I had to beg a local trans shop for the pin and valve for the GM version. bought a new one, used the used pieces, ALL GOOD ever since (4 years/ 20,000+ miles). I also have 998 in my 401 Gremlin. It took 3 rebuilds and over $1,500 to get it dependable. If you never heard of one the 998 is like the middle brother of a 904 + 727( closer to the 904). If your going to have one rebuilt find somebody that specializes in the type your using. There are enough aftermarket pieces out there to make any transmission almost bullet proof, if you know the weak points before hand- Not by finding them while you go. If I break the 998 again I'm going to have a th400 quadratrac bred with a short tailshaft 2wd chevy. TaDah- a no adapter th400 for AMC's.
1975 J20 360-4spd
1973 Wagoneer 360-AT
1975 AMC Gremlin 401-AT

Last edited by timmy401 : 12-24-2009 at 08:04 PM.
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Old 12-23-2009, 10:42 PM
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wonderwag wonderwag is offline
Join Date: Dec 14, 2009
Location: keizer,or
Posts: 150
just look at advance adapters web site, they sell adapters for every t-case to mate to a th400 and none for the tf727
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Old 12-24-2009, 12:36 PM
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gotgas gotgas is offline
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Old 02-08-2010, 09:03 PM
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Tatsadasayago Tatsadasayago is offline
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Location: Sacramento, CA
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Having long term experience with both transmissions and knowing the good, the bad and the ugly of both......

If they are maintained properly both will last a long time. If abused and neglected both will fail.

I like em both and only lean toward the 727 because of my long racing history with them and in the long run, the TH400 costs more to keep alive behind 500+ HP and torque numbers in the 600 Lb/Ft ranges.

In my FSJs I don't really care which one is installed.

Oh, and regarding leaks.......THEY ALL LEAK if not taken care of.

76 401 Wagoneer *The Gag-O-Neer*
77 360 W/T Cherokee Chief *Blair Jeep Project III*

Sacramento, CA USA
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Old 02-08-2010, 09:44 PM
lodmccloud lodmccloud is offline
Join Date: Dec 05, 2009
Location: Vale, NC
Posts: 79
Both are equal in terms of quality in my opinion, this is coming from a Mopar and Chevrolet household. I have 2 Big Block Mopars one a 440 the other a stroker 496 off of a 383 block. I have reamed the life out of both and never had a problem except doing stupid things like neutral drop or backing one of them down...........when I was younger. That problem you can fix with new parts and better internals.

The th400 I have to say is my favorite for towing duty, I ran one so hot it melted the O ring holding the dip stick in. Hosed it down with a water hose after I put the dipstick and oring in and finished the drive home. I think the th400 has more drag I know it eats a lot of power to get it moving.

Both can be built to last just about forever now even under huge strain and massive horsepower.

Remember they are fourty plus years old a new 4L80e 4L85E, or even the a518 is going to be better all around performance.
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Old 02-09-2010, 11:54 AM
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Lindel Lindel is offline
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Location: Carpentersville, IL 60110
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I vote for whichever fits between the engine and transfer case.
Jeep Grounds
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Texas Full Size Jeep Association
1987 Grand Wagoneer
AMC 360/TF727/NP229
1999 Wrangler Sport

“Freedom is never more than one generation away from extinction” by Ronald Reagan.

Formerly of DFW/Gun Barrel City, TX - eventually to return...
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Old 06-13-2010, 04:34 PM
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janie janie is offline
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My vote goes to whiechever one pukes the least.
He is your friend, your partner, your defender, your dog. Faithful and true to the last beat of his heart. You owe it to him to be worthy of such devotion.
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