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stay with 700r4 or go with th400

stay with 700r4 or go with th400

  • 700r4

    Votes: 46 53.5%

  • th400

    Votes: 40 46.5%
  • Total voters
    86
wraenking

wraenking

1/2 ton status
Joined
Apr 30, 2003
Posts
1,493
Reaction score
2
Location
Toms River, NJ
im still up in the air on what i should do. ill be doing some offroading and some around town driving. no long trips.

keep in mind, i have access to anything i need to complete the th400 swap for a good price. i also have 3/4 tons with 4.10's if that adds into it.


also, is there a good write up on doing the th400 swap?
 
What are wanting to gain by converting to a 400? I converted from a 700r4 to a sm465. It took about a day, And so far it is holding up better than the 700r4.
 
I did the swap in my 89 then again in my 90. If you do the th400 switch and have to rebuild the trans then put a low gear set in it. I did not hook up the kickdown and have had no problems with it over the past 3 years. You will also need vacumme to the modulator. Overall it is a pretty easy swap.
 
what power are you putting through it, what transfer case? I have a th400. But would love the OD of the 700r4 but I need the strength of the 400
 
Overdrive and lower first gear. lower thn the "low gearsets available for the Th400. 3.64 to one versus 2 something for the Th400 and the r-4 can be built nearly as tough........of course the 4L80 would be the best of both worlds
 
I am building my truck for crawling. I am after strength and reliability so I am going to swap in a TH400 next. The low 1st in the 700R4 is nice (3.06:1) but it won't hurt me that bad crawling. The Tuned Port makes plenty of lowend grunt to crawl with.

I am on 700R4 #6 currently and this is the last one I am going to try. I am going to swap the TH400 in and forget about it.

Harley
 
no thanks. I already have a TH400 sitting in the garage. The K5 doesn't see alot of highway use anymore anyway to the OD is pretty much useless to me. The TH400 will cost me less to build and last longer.

Harley
 
im going to run the factory 700r4 in my 85' till it fails me, im giving it just one chance (though my friends think im foolish). then im going to a 400. im also giving that just one chance, and if i break that one, i will be going to a sm465. i dont think you can break those. and even if you do, it typically will still be good for a 100,000 miles after anyways.
 
yoshisv said:
What are wanting to gain by converting to a 400? I converted from a 700r4 to a sm465. It took about a day, And so far it is holding up better than the 700r4.
Click to expand...

holy freaking crap, you did that in a day?

if you can afford it i would say go with a built 700r4
 
jeez. why does my poll have to be around 50/50?

lol

im running a sb 350 bored .30 over. truck avenger carb, 4.10 gears and a 208 transfer case.
 
I like my 700 with 37s' and 4.88 gear, stock motor.
 
wraenking said:
jeez. why does my poll have to be around 50/50?

lol

im running a sb 350 bored .30 over. truck avenger carb, 4.10 gears and a 208 transfer case.
Click to expand...


It doesn't sound like your making a huge amount of power/torque, I would just go with a built 700-r4. Nice 1st gear and OD if you need it.
 
i just talke to the guy that will be swapping the trannies for me and he said the same thing.

ill stick witht the 700r4 and have hime beef it up a bit ans make damn sure i put the support arms from the cover to the engine mounts in!!
 
th400 is tough as hell and cheap to build. Can't beat that combo for a trail rig IMO. I have had a built 700.. and its never let me down before, but if your future plans are full of hardcore wheelin, BBCs, huge tires etc... just go 400 from the start. In hindsight, thats prolly what I should have done.

My 400 will have a deep cast pan, Redneck Trans reverse full manual valvebody w/ compression braking, 34 element sprag, stock-stall TC, Art Carr cable shifter, B&M cooler, remote filter and a temp guage. Don't forsee the thing breaking anytime soon, which is good because I plan on beating the crap out of it. :grin:

j
 
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