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Old 02-09-2005, 11:27 AM
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700R4 or TH400 w/ overdrive

i did some research on the web and on this site. unfortunately i couldn't fine a good thread on this specific subject. if anyone knows of one, please put the link.

my question is pretty obvious: should i get an overdrive for my TH400 or a new 700R4. both were around the same price~2,200.

Pros for overdrive:
my trans (th400) was rebuilt so its like new, and having an overdrive is like having 6 gears.

pros for 700R4.
i can sell my old trans, and its pretty much a direct replacement.

i know i would need to get a new driveshaft for the overdrive, and if i measured right the 700R4 is 2" shorter than mine.

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Old 02-09-2005, 02:03 PM
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An over/undrive system is in the area of $2500.00.

If it was me I'd be going with a 700r4.
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Old 02-09-2005, 06:10 PM
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What do you have in front of the TH400? It can take a bunch more hp than the 700R4. If I had a fire breathing monster in front I would stick with the 400 and get a GearVendors OD unit for it.

Vince

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Old 02-11-2005, 06:47 AM
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buick 455 370 HP
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Old 02-11-2005, 07:38 AM
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Quote:
Originally posted by 302/Z28
What do you have in front of the TH400? It can take a bunch more hp than the 700R4. If I had a fire breathing monster in front I would stick with the 400 and get a GearVendors OD unit for it.

Vince

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Ditto! excellent suggestion!
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Old 05-28-2007, 07:26 AM
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700R4 0r 400 w o/d

If you change to the 700R4 ,you will need a new front yoke. The spline on the 400 is bigger than the 700R4 . Please be aware of that before just getting your's shortened! Hope this helps!
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Old 05-28-2007, 07:44 AM
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Quote:
Originally Posted by 302 Z28
What do you have in front of the TH400? It can take a bunch more hp than the 700R4. If I had a fire breathing monster in front I would stick with the 400 and get a GearVendors OD unit for it.

Vince
Yep, agreed.


Mark
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Old 05-28-2007, 08:04 AM
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Quote:
Originally Posted by 53LEDSLED
buick 455 370 HP
Unless I am mistaken ... a 700R4 does NOT bolt up to a Buick 455
I have NEVER seen a 700R4 with the B-O-P pattern.

So you either need a adapter to put the 700R4 behind the Buick ( more $$$ )
Or get a 200-4R for the overdrive.
I believe I would go for the Gear Vendors OD ... because the 400 Turbo has no funky TV cables, is less sensitive to trash in the fluid and is almost indestructible as long as you keep fluid in it.
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Old 05-28-2007, 08:22 AM
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Quote:
Originally Posted by Machinist59
If you change to the 700R4 ,you will need a new front yoke. The spline on the 400 is bigger than the 700R4 . Please be aware of that before just getting your's shortened! Hope this helps!
welcome to the board.


please read the dates on threads when you do a 'search'.... the thread you posted to is over 2 years old.

a BOP bell housing 700/4L60 trans was never released to the general public
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