GM Turbo 350 Transmission Installation Guide

This trans swapping guide is for early Chevrolet iron and concentrates particularly on first- and second-generation Camaros. It may be the most complete resource guide the crack Chevy High Performance editorial staff has ever created. We have gone to great lengths to supply you with as much swapping information as could be dug up. The TH is a bolt-in replacement for a PG, making this swap a relatively straightforward one that requires no crossmember or driveshaft modifications. This swap is pretty straightforward in any early Chevy, considering that TH s were optional in most of them. If your vehicle ever came equipped stock with a TH trans, then you could pick up a crossmember from the scrap yard or a source like Classic Industries, which would allow the TH to bolt right into your stock frame. And the same shifter can be used to control either a TH or TH

BM 20234 Modulator For GM TH350 and TH400 Automatic Transmissions

FAQ Should I use an external transmission cooler in conjunction with the oil cooler supplied in the radiator? This allows the transmission to have its own cooling system and doesn’t allow the engine water temperature to heat the fluid. What is the correct size cooler for my application?

The vacuum modulator is a vital component of automatic transmissions. It tells the transmission what kind of load is being put on it, allowing the transmission to react with the proper line pressures and shift points. Over time, modulators can develop leaks, suffer ruptured diaphragms, become bent, etc. This can not only cause annoying drivability issues, but it can lead to premature.

The easiest way to tell them apart is with their pan shapes. But this photo also illustrates their outward appearance. CHP The password for cool ’90s street performance is Late-model automatic and manual overdrive transmissions are quickly becoming the sweethearts of the street set. Not that long ago, a fast street car meant compromises, including deep gears, high-rpm highway cruising, and poor mileage. But the high-tech ’80s and ’90s have brought us more than just electronic fuel injection.

They also delivered durable automatic overdrive transmissions. While the TH R4 has garnered most of the attention as the performance automatic overdrive of choice, companies such as TCI and Art Carr consider the TH R every bit the ‘s equal in terms of torque capacity and durability.

TH400 Shift Early & Soft / No KickDown

Forward Clutch Pack Installation Step 1: Install the forward clutch pack steels and frictions. Note that you start out with a waved apply steel. Install the snap ring and push it out tightly into the groove.

Check the vacuum modulator, which controls shift firmness. Either the modulator itself has failed (like anything vacuum-opersted, it has a rubber diaphragm that can crack and leak) or the vacuum line between modulator and engine has gone.

Can you change an automatic transmission to a manual? As far as i know, it is impossible to change thetransmission itself but it is possible in most cases to change anauto tranny car to a manual. It will take some work and it is acostly change to do, but it can be done. The real question is “isit worth it”. On the one hand, you would be be…tter off just buying a new car forthe type of prices charged to do that.

On the other hand if youwant to do it yourself, read on.

Old, but any experts on TH350 / TH400 ?

The fact that it is not electrically actuated by solenoids means it requires other apparatus to regulate shift points. Simply put, an automatic transmission, whether an early or late model, relies on hydraulic pressure to change gears and to regulate at which time it does so. The vacuum modulator affects the shift points with the use of engine vacuum. Testing the Modulator 1 Block the rear wheels.

Feb 19,  · just worndering where the best place to hook up the vac line to my thi have it running to the carb now but was thinkin to the intake would be a better.

I would also recommend that you have another person present when lifting a transmission into place. I’m sorry about a lack of photos. If anybody has a photo that shows the difference between a long and short version of the TH , please contact me just be sure that it isn’t copyrighted. November 4, ; I’ve gotten a fair amount of questions sent to me in regards to hooking up the original floor shifter. He was happy with the kit, however, the cost for everything seems to really add up.

Be sure that you add up ALL the costs before making the jump then think about the fact that there may not be any other option. Shiftworks has a web site and to get there, click here. You will have to use your “back” button to return here. If you end up buying one of their kits, let them know that you heard of them from here.

Ask Away: How Do You Hook up a Turbo 400 Kickdown? (Hint: It’s Not Like Other 3-Speeds)

The 2-speed Jetaway trans used behind the V-8 [not the L6] in the models also utilized a switch pitch torque converter. For a transmission built during these three years, you can identify the transmission as having the switch pitch parts by the electrical connector on the side of the trans case. A run-of-the-mill TH will have a single spade terminal protruding from the case to activate the kickdown solenoid valve.

Nearly every automatic transmission has some kind of kick down apparatus and they are all different. THs use a cable connected to the carb linkage, R4’s use TV cable, Ford C’4’s have a rod, and Chrylser’s Torqueflite used a cable as well. But, GM’s TH uses a combination of vacuum.

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TCI Transmission & Converter FAQs

The passing gear on the transmission has never worked. When cruising about 35 mph, if you floor it, it just slowly relatively accelerates. It seems pretty obvious that it is not downshifting. The trans is rebuilt and has no problems shifting normally otherwise. I found an electrical switch on the back of the trans that I was told was the kick down switch.

The round vacuum modulator can create a number of shifting problems. They include harsh up/downshifts, soft up/ downshifts, delayed shifts, overheating, and slippage in all gears. If you are experiencing any of these symptoms the modulator is a good place to start your diagnosis.

TH Posted 23 January – The thing with idle screw – I can make it idle more or less steady at about rpm which is way too high, if I switch into drive TH it goes bang, makes hard to operate the car and its just wrong. Idle at could be doable but then as soon as I select drive it almost stalls and sometimes actually stalls. The idle mixture screws – if I turn them all the way in it will start to sputter so it makes it lean, if I screw back like 5 or 6 turns I did not count really but alot of turns then again it will start to decrease RPMs and obviosuly goes too rich, but anything in the middle seems to make no difference.

Its not like half a turn in one direction or another would make any difference at all. And exactly the same thing was with Edelbrock carb, which I thought is broken. So thought I will be smart and adjust the idle screws by vacuum gauge, but look at that vacuum gauge – it does not make any sense! I am thinking maybe the engine is so worn that it just cant idle anymore. But then it does not smoke at all, not burning oil.. I have tried various timing settings. To what I understand it should be set to anywhere between 6 to 12 deg before TDC with vacuum advance disconnected.

When I connect to manifold vacuum, the RPMs go up advance increases but its impossible to set a decent idle. So what should it be the initial timing advance for this 67 engine with heads?

Vacuum Lines Connection


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