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Old 10-15-2011, 05:19 PM
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T-400 or 700r4

hey guys i have a th350 in my truck now i have a 700r4 core to be rebuild. i was wondering should i go with the 700r4 or the th400. the truck is a daily driver for now.( 85 c10 350 est 425hp ). but will eventually be my weekend warrior. i dont mind having one built now then one build when i make it my weekend truck

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Old 10-15-2011, 11:39 PM
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The 700R4 will take a lot of punishment IF built properly and is nice to have the OD for cruising.
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Old 10-16-2011, 12:15 AM
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A stock 700R4 should be able to handle 425hp without being modded/gutted. Thats very close to its top end though. I'd very very highly recommend a 700R4 over a TH350 or 400. That 4th gear opens up a lot of options towards rear end gearing, and its a much nicer tranny to use. Dont be utterly stupid with it and it should last you a very long while without trouble. If you plan on dragging and doing stupid ****, it would be wise to have it modded to easily handle what you're after.

I've never met a single person that perfers a 350/400 over a 700R4 in terms or drivability. Every person thats made the swap over to a 700 has nothing but praise for them.
I to wanted to go with a TH350/400, but the lack of options a 3 speed gives, really kills it for anything short of building a hardcore bracket car.
There are many places that build racing trannies, so if you plan on surpassing the 425hp, then I'd give the 700R4 to them to redo, and just stick with that.
You'll thank me in the end for making that suggestion, as the fuel economy you'll save sure pays for the upgrade.
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Old 10-16-2011, 07:55 AM
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What rear end ratio do you have? If in the 2s, I would use the Turbo 400..

I had a 2.75 first gear set installed into my turbo 400 and use a 2.56 posi. It's a fantastic combination..

I cruise at 75 mph @2100 rpm. The nice thing is my driveshaft and pinion bearing are running at a nice slow speed with the 2.56

When I need more speed, I just hit the gas and dip into the converters torque multiplication and it goes.. No lugging or shifting back and fourth...

The install is a snap, no linkage, no electrics, just a vacuum hose.

Torque converters have come a long way in the last ten years. I use the Continental 13"..

My 64 Pontiac Bonneville has a 462 with 500+ft.lbs.

Frankly, either way is going to be a win...
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Old 10-16-2011, 12:11 PM
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i had a ten bolt 3:42. but changed it out for a 12 bolt 3:08. just cause i wanted the twelve bolt and eventually get a posi unit and either 3:73 or 4:10 gears for it. thanks for yall's advice
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Old 10-16-2011, 06:10 PM
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is there any modification i have to do to make it fit. 85 chevy truck. i have th 350 short shaft now and the 700 has a short shaft. i know ill prolly have toget a different speedo cable. and theres some kind of electrical looking plug in on the left side of the 700r4 idk what thats about??
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Old 10-17-2011, 06:13 AM
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You'll need to shorten the DS/DriveShaft about 3" if your TH350 has a Short/6" Tailhousing. You may find the correct length DS in a Salvage Yard as many Trucks came stock with the 700R4 Trans. A TH350 w/9" Tail is the same length as a TH700R4, check your TH350's length as most 73up P'ups came with 9" Tailhousing.
The rear Mount is also about 2" farther back on the TH700R4, so the Crossmember will need to be moved or Fabbed to work.
Trans dimensions >> http://www.tciauto.com/tc/trans-dim & http://www.maliburacing.com/auto_tranny_id.htm

The electrical Plug is for the TCC/TorqueConverterClutch Lockup, you can wire it yourself or buy a Lockup Kit. they're available from dozens of Co.'s from $20-$180.
http://www.hughesperformance.com/pdfs/HP700-R4.pdf
Cheap >> http://www.ebay.com/itm/250782490188...84.m1423.l2649
Not Cheap >> http://www.summitracing.com/parts/BMM-70244/

More >> http://www.summitracing.com/search/P...?Ns=Rank%7cAsc
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Old 10-17-2011, 02:34 PM
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do i absolutely need this part? and what exactly does a lockup do? i would like to put a shift kit and a corvette servo in it to to get a little hardershift.
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Old 10-17-2011, 07:33 PM
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The TCC Lockup acts just like a Manual Trans clutch. It eliminates the slippage in the TC. All TCs slip a small amount, usually 150-300rpm for a stock TC.
The Trans will run cooler & get better MPG if you use a Lockup Kit. Some models shouldn't be run in O/D for long periods with the TC unlocked, overheating and lube problems/damage can occur.
Some Info here >> http://www.transmissioncenter.net/700r4.htm many builders don't recommend running any 700R4's with the TC unlocked.
There are also Non-Lockup kits to run a Non-Lockup TC.
Either way you choose is actually very simple to do.
Good Info here as well >> http://www.rowand.net/Shop/Tech/Auto...issionSwap.htm

Very good Shift Recalibration Kits >> http://www.ckperformance.com/resourc...governors.html

Do you know what year model your 700R4 Trans is?
87-93 are the best Cores to build, these have all the Factory/OEM Upgrades..
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Old 10-17-2011, 10:27 PM
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i got it out of a junk yard. it says 2000 chevy van on the side of it. and the lock up, do i have to keep flippin a switch evrytime i drive or can i leave the switch on at all time. cause id like to stomp it and it kick down into third or second (whichever gear they shift down into) and not have to flip the switch off stomp it then when it shifts into fourth and then crusin have to flip the switch to activate it again. and the non lock up kit, how will that work with the shiftng and all. plus i would like to run a 2500 stall too.
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