Need a good 4 spd tranny to put into a jeep with a V8, 350. Any ideas?    

sm 465, sm 420, please see novak conversions.  

If you are going manual, I would not waste time with a 465 or 420. I would go with a NV4500 5 speed. Much wider total gear spread and 4500 is not long either and easy to fix in. If you use a 96 to 2000 SB/BB 4500 bellhousing and a Dodge 4500 with a 23 spline output it will bolt right use to a Dana 300 Tcase. YOu will need a adaptor to use Dodge tranny in bell housing as input shaft is longer (or use a adapter between Dodge bellhousing and engine) If you use a GM 4500 then they are all 32 spline output while Dodge can be 23 or 29.  

What do you think of the T~18A?  

andyd89:
What do you think of the T~18A?

A T18 is not a bad tranny but this is 2008 not 1975 and there is some fine 5 speeds out there that shift much better and give you a wider ratio range too. A modern 5 speed HD OD tranny with a set of deep gears in axles rules the day over ANY 4 speed tranny.