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Re: TH350 to 700R4 Help!!!
The TH350 did indeed offer lockup from 1979 onward - this transmission was called the "TH350C". TH400 never got lockup. The 700R4/4L60/E design was originally based upon a TH350 with lockup added, but evolved. Some parts commonality with the TH2004R was available at the outset, things such as front pump, torque converter etc and this lasted midway through the 1984 model year.
The mount on the TH700R4/4L60 sits about 1/2" behind the location of the TH350 mount, so you can either use a TH700R4 crossmember, or you can lengthen the mount slot in your existing crossmember.
The 700R4 and TH350 9" trans will both use the same driveshaft (difference in overall length between both is 1/8", negligible), however 1977 and up B-body cars which had the TH350 had the standard 6" version and not the 9" version (which is found in 1971-1976 B cars along with Cardan CV joints).
The shift quadrant needle won't go further, it will just have one extra stop in it.
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1988 9C1 - Modified LM1 @ 275HP/350TQ - TH700R4 - 3.08 8.5" Disc Rear - see it at http://www.silicon212.org/9c1!
2005 Crown Vic P71 - former AZ DPS - 4.6 liters of pure creamy slothness!
1967 El Camino L79/M20 old school asphalt raper
Remember - a government that is strong enough to give you everything you need, is also strong enough to take everything you have.
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