Turbo Hydramatic 350
Jeep New Process 208, 219, 228 & 229 Transfer Cases
The Novak TH350 to NP/FSJ transfer cases adapter is very compact at only 3.1" long for a combined transmission and adapter length of 24.8". The adapter itself is cast and machined of a high-grade aluminum alloy, featuring thick flanges, a heavy cross-section and strength-adding gussets.
Any version and year of the TH350 can be adapted to the Dana 300, from Chevy, to Buick / Olds / Pontiac and Unicase versions of the TH350, as determined by your choice of engine.
Transmission Output Shaft
2wd TH350 versions work great when you choose our #135-S kit and install the new, included 4wd style transmission output shaft. This included, 23 spline TH-350 output shaft is machined from triple-alloy gear steel and provides a superior upgrade. This shaft is compatible with and splines in directly to the OEM style input shaft in the NP / FSJ transfer cases. This requires disassembly of the transmission, and we recommend the services of a transmission professional. The basic installation is 2-4 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 of the HydraMatic.
Installers using a 4wd TH350 can also use this #135-S kit, noting that the included transmission output shaft will replace the OEM style 4wd shaft. Individuals that are unsure what TH350 they have (or will have at the time of the conversion) can choose this option.
Transmission Rear Mount
This transfer case adapter's design is based on Novak's Universal Series adapters that feature a modular mounting and support system. Included with the adapter kit is a steel base that is a highly configurable mounting foot, and is ready to accept our industry standard urethane isolator mount, available for purchase (box, left). This is our preferred rear mount unit. Our #135 kits are designed for it, and its usage is essential to protect powertrain components from the flex and jar typical of any automobile, but especially Jeeps.
Whether you are assembling onto a stock cross member / skidpan or if you are setting up a high-clearance skid plate, you will find it to be a clean and simple process.
Transfer Case Shifter
This transmission conversion will allow for the retention of the factory shifters, or allow you to upgrade to a twin-stick shifter.
|We’ve seen a few shafts broken like this one, and heard our customers speak of many more failures of output shafts made by other adapter companies. This is why we go through the trouble and expense of making our output shafts from a solid bar of alloy steel, instead of friction welding salvage GM shafts. A second, sometimes less obvious but pernicious problem is the issue of warpage during friction welding and heat treating - which cannot be corrected when the shaft journals are already ground and worn at or below factory specifications.
The Novak shaft in our #135-G kit is produced faithfully to factory specifications, and using even better steel. Our 4-axis CNC cut of the spiral gear and other features are no small tasks, and likewise, no small benefit to our customers dedicated to putting their Jeeps together right.
A broad variety of transmission shifters are compatible with this conversion, ranging from console shifters (i.e.; Art Carr, B&M, etc.), to direct-mount stick shifters (i.e.; Gennie, Lokar, etc.).
You may also use your factory FSJ column shifter, as it has the same throw and detent pattern as the TH350 requires.
Clocking Information & Driveshaft / Yoke to Pan Clearance
There are no driveshaft clearance issues with this conversion. If you are installing against a factory AMC engine with our #437-AMC adapter kit, your factory engine should already have this proper offset.
Driveshaft length changes are often required, as this geartrain combination is typically longer than factory Jeep combinations. However, some GM engine installations will allow for the transfer case to remain in its OEM location.
Some of our customers, fearful at the perceived expense of new or modified driveshafts, attempt to let the existing driveshafts dictate engine, transmission and transfer case location, sometimes to the detriment of the project. Driveshaft modifications are usually inexpensive when performed by driveline, RV or tractor implement specialists. New driveshafts are an option but seldom a requirement in regards to the actual successful conversion. Jeeps that require extensive travel or specialty-built driveshafts have this option available through several fabricators across the nation.
For every 10 degrees cooler you can keep the transmission, you can add 25,000 miles to its service life. Therefore, use of a transmission oil cooler is advisable for this automatic transmission. Use of a transmission temperature gauge is also a good idea. These are widely available and generally inexpensive.
With the increase in popularity of the newer, hotter burning, fuel-injected engines, it is increasingly wiser to run a stand-alone, dedicated transmission fluid cooler.
|Novak's MM Series engine mounts, featuring excellent vibration dampening, superior strength and impressive adjustability - adjustable even after the engine is installed. The design, strength and affordability of our mounts are second to none.|
Engines & Engine Mounting
A Turbo 350 installation is typically done in conjunction with an engine conversion into the Jeep. These engines include the Chevrolet Small Block V6 & V8, from Generations I, II, & III, 1955-2006.
|Advanced computer modeling methods were itegral to the design of our #135 adapter assembly. We were able to push the bounds of product and process well beyond the status quo.|
In any scenario, it is critical that the engine be installed (as the Jeep engines usually are) with an offset of 1" to 1-1/2" to the driver's side. Other engine mounts on the market - especially the bolt-in versions - do not take this into account and make other placement decisions for the installer that do not take the full powertrain into consideration. Novak offers what we have found to be the most intelligent engine mounting system for Jeeps available, allowing the installer to make an easy and satisfying decision as to powertrain placement with the TH350 and the Dana 300 both considered.
Use of factory axles is completely acceptable with this conversion. Axle upgrades are not necessary, but they may be chosen for reasons external to this transmission upgrade.