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Which Auto, TH400 or TH700?

General Tech Talk

Moderators: toaddog, TWISTY, V8Patrol, Moderators

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TH400 or TH700?

TH400 - 3 speed
6
30%
TH700 - 4 speed
14
70%
 
Total votes: 20

Posts: 1949
Joined: Wed Oct 23, 2002 7:44 am
Location: Melbourne, Australia

Which Auto, TH400 or TH700?

Post by MKPatrolGuy »

I have decided to go an auto behind the Chev in my MK, but I am undecided wether to go the 400 or the 700. I have heard the TH 400 is stronger but the TH700 has the advantage of overdrive. It will be mated to a GQ transfer case.

Which should I go and why?

P.S. anyone running 35-36" tyres and 4.6 diff ratios can you tell me what revs you are doing at 100km/h in top gear (i.e 1:1) in an Auto or 4th in a manual.

Thanks
[size=100][url=http://www.vickrawlers.com/]VicKrawlers.com[/url]
[url=http://www.drfwdc.org.au/]Dandenong Ranges 4wd Club[/url][/size]
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Post by MissDrew »

The 700 is basicly a TH350 but with an over drive.

The 400 is by far the stronger box.

Our 80 has a 4 speed auto, 4th being an over drive, we never turn it on as it makes no differance to the fuel but pulls harder on the uphills.
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Post by RUFF »

The Turbo 700 has a lower first gear as well as over drive and a lock up converter. And can be built to handle a lot more HP then your Patrol would be making.

The T400 is a Heavy outdated Auto.
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Post by Dozoor »

Mk

Rpm @ 110 ks TH400 3,036 Rpm 3rd

Rpm @ 110 Kz TH700 2,125 Rpm Overdrive.


Larry
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Post by scotto »

I have heard the TH700 has a smaller output shaft and therefore maybe more vulnerable to breaking than 400.

While gearing gains are better does this simple little fact a problem with the 700? Am also considering an auto...
www.3rdrock4x4.com
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Post by hienuf »

i havent had any experience with the th700 so wont comment.

i had th400 behind my 350 in mq and what a awsome auto....never had a problem.........strongest box i have ever seen.....solid shifts.....but i know first gear isnt as low as i would have liked it.....
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Post by Patroler »

what about the 4L80E? thats a stronger version of the t700, basically a t400 with overdrive? might be a bit costly, maybe cheaper to build up a t700 though.
At 3 grand in 4th with 4.6:1 diff and 35 bfg's i'm doing 100, with the 36" simexes its closer to 105, thats measured with the gps.
There are no stupid questions, but there are a LOT of inquisitive idiots
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Info

Post by Damo »

Some good info to make your own comparisons here:

http://www.novak-adapt.com/catalog/tran ... apters.htm

Go to the bottom of the page, it has a run down of each tranny.
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Posts: 1949
Joined: Wed Oct 23, 2002 7:44 am
Location: Melbourne, Australia

Post by MKPatrolGuy »

Thanks for all the info guys. I will probably go with the TH700 judging by all the replies. Now I just have to find one. I think I might go talk to Rodney at Wholesale Automatics as he is just around the corner from work.
[size=100][url=http://www.vickrawlers.com/]VicKrawlers.com[/url]
[url=http://www.drfwdc.org.au/]Dandenong Ranges 4wd Club[/url][/size]
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