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HybridZ

????? for tranny gurus


stony

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ok here we go im looking for something for the RB. the rodshop in austrailia makes an adapter for a th350/400. I would like to know what i need as far as upgrades so the tranny withstand 450-500 HP. I want to do the tranny before i backhalve the car jsut to see if i can get it into the 10s.

 

Also what can i expect to pay for something like this....I want to run a 3000-4000 stall this should help the turbos get spooled for launch

 

stony rockon.gif

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In my experience with TH350, it's not the HP that kills the tranny, but RPM. If you turn the motor 6200 rpm you should have no troubles with a street/strip built TH350, if you turn it 6800 rpm plus that may not be the case.I had LOTSof problems with the mechanical governer braking. After breaking 4 in a year including a full manual valve body trans that had a front pump failure (in a school zone of all things!)I solved my troubles by going to a Super T10 4 speed :D The TH400 is significantly stronger but also penalizes you with a dramatic weight increase and power consumption. If memory serves, it takes 18 hp to just rotate the weight of a powerglied in top gear, 35 hp for a TH350 and 48 hp for a TH400. This pales in comparison to the 60 hp for a Ford C6, but shows a top end advantage to the 10 hp it requires for a manual trans inertia. With the weight of a Z and the torque of your turbo motor, you can probably pull off a glide. I believe you want your converter to flash about 200 rpm shy of your torque peak. A well built TH350 should set you back about $500 locally and $550 for a TH400, more if you add an aftermarket sprag (recommended)Figure at least 300 for a 3500 rpm converter, more for a strip only type. TH350/400 use the same converter, but a powerglide is different, but aftermarket ones are available with a TH350 style input shaft. If you mail order a trans, a Hughes seems the way to go. TCI seems to have a high failure rate (at least in their OD trans that I know people who have bought) B&M seems OK and Summit has their TH350 for $900 w/out core.

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