E-MAIL US | PHONE OR TEXT: 253-320-7604 | PHONE HOURS: MON - THU, 5 a.m. - 2 p.m. PST
TH400 Versions These kits are for all years and versions of the popular HydraMatic 400, including Chevy, Buick and other GM, AMC Jeep, etc. and work with 2wd & 4wd versions.
Transmission Output Shaft Every kit comes with a new output shaft for the TH400, whether for 2wd or 4wd transmissions. 2wd versions work equally well as 4wd versions. The Novak output shaft is of an alloy steel, precision splined and hardened for a superior interchange. This shaft connects the TH400 output direct to the included adapter shaft for the strongest cobination. Installation requires disassembly of the transmission main assembly, and we recommend the services of a transmission professional. The basic installation is 3-4 hour bench job and may include simple gasket and seal replacements. Some choose this as the time for a more thorough master rebuild and update.
Transfer Case Input Gear Dana 18 & 20 transfer case input gears are most commonly i.d. splined to 6 splines, and this is the configuration of the majority of our included adapter shafts. International Harvester Dana 20's that had the TF-727 automatic had a 23-spline input gear, which must be replaced by a compatible six-spline version. Consult our informative Dana gears interchange chart if necessary.It is not required that you rebuild your transfer case to successfully complete the conversion, but it may be a good time to do so if your transfer case leaks or has many miles of service.