A518 vs Gm's 700r4

[Big Sugar]

Ok Ive got a couple of questions
Updating to a Overdrive auto and decided to go with a A518 46rh  I have a good core complete with the torque convertor but it will need a full rebuild and upgrade
The stall on these lock up  torque converters were around the 14-1600 rpm range or so ive been told, and the Chrysler converters were apparantly well built braized units.
Can these lock up converters be rebuilt and upgraded to a higher stall in the 22-2400 rpm range ?

While I was looking for the Jw ultra bell for the 518 - big block conversion I spotted a mopar big block 700r4 ultra bell as well 
These trannys are plentyfull and quite a few companies build stout 700r4 performance trannys .

Anyone run a 700 in a 66-70 B Body ?   How well does it fit ? I read there was a bit of a header issue due to the wider pan area ?

Any help appreciated
Ron

[flyinlow]

Don't know about the fit, but the 700r4's first gear ratio of 3.06 and larger converter choice is attractive.

[John_Kunkel]

The factory stall speed rating for the 46RH is 1800-2300 and a more powerful engine will stall higher than that.

When properly built, the 700R4 is a fine transmission, Keisler offers a Mopar conversion based on the 700R4/4L60E so we know it fits. It has the advantage of lower first gear and the OD is inside the case instead of on the rear.

[Kern Dog]

The 700R4 is physically smaller. It does fit the chassis without cutting anything. It does require a modified trans crossmember.
The 700 does have that deep first gear  of 3.06, but the second gear is a huge drop off at 1.62. If you wind it out in first, the upshift may leave you at the low end of the power band if you have a rowdy cam. Stock cams have a wider power band so they work okay with them.

[cowboy4x4n]

Correct me if I'm wrong but both trans would require A modification the the cross member

[Big Sugar]

Yes.  Both require a little crossmember work and there may be a little header interference as well with the 700


Ron