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Old 02-15-2012, 07:43 PM   #1
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700r4 or th400 transmission???? help me decide

II have a 6.0 motor at 400hp minimum and will most likely go up soon. I know the 700r4 has lower first gear and over drive. But I know the th 400 are cheap and all over the place. 700r4 sounds better to me but I only just heard about it and haven't done any research. Let me know thanks

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Old 02-15-2012, 07:57 PM   #2
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I got a "51 Willys with a TH400 and B&M innerds behind an EFI small block Cheve motor with a few ponies in it and have never had a problem with it. Never ran a r4 so can't help there. Maybe someone else can clue you in on the r4. Have fun.


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Old 02-16-2012, 04:33 AM   #3
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Back in the day, the TH400 was a super transmission that was tricked out by racers because they were tough and dependable. The 700 transmission is a great transmission for mild applications. It has a good overdrive in it, but I can't speak for its strength or dependability behind 400+ horsepower. Call a transmission shop you trust and ask about it.

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Old 02-16-2012, 08:48 AM   #4
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If your jeep will see any highway time def. go with the Over drive. the 700r typically gives up the ghost around a hundred thou. on every one i drove so plan on a rebuild if it's used.I should handle 600 hp after the rebuild no prob.And dont forget if you have a auto now in your jeep..you will need a new shifter to accommodate the extra 4th od gear...kman
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Old 02-16-2012, 09:12 AM   #5
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well no matter what trans i get i planned to get i plan to get the floor shifter and just change my already beat up column, 700r4 sounds better in the long run, but i dont have the funding to build one, it will get some highway miles but i dont mind being stuck under 80 b.c if i go faster ill kill myself. i think th400 sounds best b.c i can get a custom built one brand new for 1200 with a 100k warranty
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Old 02-16-2012, 02:12 PM   #6
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ok now i completely changed my mind, im going turbo 350 HD b.c it is shorter. my only question is will it bolt up
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Old 02-16-2012, 02:55 PM   #7
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Quote:
Originally Posted by 89JEEPYJ View Post
my only question is will it bolt up
To what?????????
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Old 02-16-2012, 07:10 PM   #8
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to my motor and i found out it will bolt up with the correct torque converter. I am told u need a special adapter plate to mate the atlas 2 tcase and the th 350. is this true???? i would think if ur spending that much money and u can customize them. u could at least get one that bolts up
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Old 02-16-2012, 07:35 PM   #9
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If you have the 6.0, why not use the native transmission, the 4L80E will bolt up and even work with your computer, adapters might be an issue, but if you get a 4x4 4L80E, you can even use the stock GM t~case with a SYE and your all set.

What rear end you running to handle all this power?

With the 4L80E, you get all the driveability of the 4 speed auto with the power handling of the turbo400.
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Old 02-21-2012, 09:29 AM   #10
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I decided not to use it b.c if i ever have a problem with transmission it will cause the motor to run poorly and visa versa. I dont want to play with a million wires from both things. THe turbo 350 SS is rated for over 550 hp and that is more then i will ever have. I have the sterling 10.5 rear which will easily handle the power of the motor. i dont need an adapter for the th350 tranny just have to get the proper torque converter. FOr the motor im getting a self adjusting computer with a full wiring harness that is plug and play. just need to put a hole in the firewall and run the wires through and plug in the computer and technically it will/sshould start. i cant affoard the atlas 2 tcase so im going with the dana 300 tcase. Total build cost of this drivetrain will most likely be somewhere around 3200 in parts

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