Pictured here is the TCI, 36-element intermediate sprag and drum assembly as used in the TH350. If this is the case, then they are not properly sealing until after a 10-15 minute idle warmup. He went on to say that if a TH350 suffers from this “aging complaint” only when cold, it’s most likely that the lip seals have become too brittle. Larry Speicher in particular mentioned how he has seen countless customers complaining about how their gearbox is “slipping” only to find out that it was suffering from what is known as a “delayed engagement.” This issue is simply the result of a low fluid level or a clogged filter/screen. Occasionally, the TH350 will hesitate on shifts, and this can be caused by a number of things, including a vacuum line leak, a blown modulator, or the bolts on the hold-down plate not being tightened down securely. When it came time to find out what the common formalities are with this transmission, both mentioned the “late shift” issue. The parts to rebuild or repair a TH350 are relatively inexpensive, and since they were offered in everything from family sedans to light-duty pickup trucks during those years, they’re so common that you could still find rebuildable units from your local wrecking yard. I constantly have customers bring me their cars complaining about a slipping transmission, when in all actuality, it’s suffering from what’s known as a delayed engagement.-Larry Speicher Scott Miller and Larry Speicher both agreed that if you build them correctly, they can handle over 700hp. We’ll be describing the pros and cons of each with Scott Miller of TCI, Larry Speicher of Gearstar Perfomance, and J.C Beattie of ATI Performance adding their input along the way. Now before you dismiss this as a tech article that doesn’t concern you, it may come as a surprise as to what can be learned. To clear the air, we sat down with three of the most respected transmission experts in the business, discussed some of the weak points of all three of these transmissions, and found out what it takes to remedy these issues. However, nothing is perfect and everything can be improved upon. Even the late-model LS guys have been seen rocking the classic TH400 on occasion.
The most common of those, at least with the older GM cars, is the Turbo-Hydramatic (TH) 350, TH400, and 700R4.Īll three of these gearboxes have earned their stripes over the years, particularly the TH400 as the unit to rely on in a purpose-built drag car. In fact, some of the quickest and most consistent bracket racers rely on a slushbox to achieve their goals.
TH350 TRANSMISSION MANUAL
Scott Miller As fun as it is to slam gears in a manual car, more often than not it’s an automatic that handles shifting duties in drag cars, and street and strip vehicles. It is also a good idea to clean or replace the cooling system when replacing your automatic transmission, so check out the protection kits at the upgrades tab.I recommend using a high-capacity pan and a transmission cooler for performance-built transmissions. Please inquire for estimated return freight on core.
This is refundable upon return of your old transmission and torque converter. There is a $400 core deposit included in the price. Of course, all of our BullRipper HD Automatic transmissions are fully remanufactured and dynomometer tested before leaving our facility, so you know it will work the first time. This transmission comes with the standard 18 month unlimited mileage warranty and has the option to double that to the 3 year extended warranty (see extended warranty category - extended warranty not available for diesel applications). You can ID your transmission by matching the pan formation in the photo, by checking the transmission ID Chart or email us with your specific application. It can be built for 2WD or 4x4 application and comes with a heavy duty 'RV" style torque converter (street stall performance converter also available on request). It is also known as a Turbo-hydramatic 350, Turbo 350, or just plain 350. This transmission was used in many GM car and truck applications including Chevrolet, GMC, Buick, Oldsmobile, and Pontiac. The lockup system was not very advanced at the time, so we eliminate it in the HD version). heavy duty utility Chevy/GMC TH350 transmission and torque converter built by Transmission Exchange Co for 1969-85 applications (note: from 1980-85, the TH350 was actually only available as a "TH350C" with lockup converter.
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