Technical Tips > Transmissions - Differentials

Manula to Auto questions

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demonx:
Car = 1970

I've read a few of the posts in this section and I see people reccomend the TH400 and TH700 boxes for a conversion, but I have a few extra questions I did not notice the answers to.

Does going from a muncie to a auto require any crossmember changes? Are there any high performance auto's that are a direct replacement without crossmember changes or driveshaft alterations?

Does it require that the shift console be replaced to an auto as I was thinking of using the manual shift console and leather shift boot even though it was auto but I'm not sure if it would allow full movement. I plan on having an auto thats got a full manual shift kit.

Does the hole in the floor and everything else line up for the shifter?

What else do I need to consider?

sirfixalot:
Have a look at tciauto.com  site  technical resources should answer a lot of questions has dimensions for different boxes & gear to strenghten box.
Auto shifters usually mount to floor not gear box so can be positioned wherever required.
Manual corvette chassis  has a fixed crossmember for gearbox. Auto chassis has a removable crossmember.

Scott:
Auto's run fluid through the radiator for cooling, so different radiator.
Autos need the kick down set-up installed on the carby.
May need a different tailshaft.
Not sure if the cross member needs modification.  Perhaps check digital corvette or corvette forum.
Will requiring re-wiring so that the car won't start whilst in gear.  I have bypassed this going from auto to manual, but I'm not sure how it works going the other way.

T400 (and T350) are a mechanical (non computer) 3 speed box.  Both are fairly tough, and are stronger than the T700.

A T700 is also referred to as a 4L60 or 4L60E. E = electronic

The T700 is a 4 speed box and was used in commondores and C4 vettes.  VN's used a non-computer controlled version.  Later commodores and C4's used an electronic version.  T700's have a lock-up torque converter which can be tricky to incorporate, depending on who you ask.  I can't remember exactly, but if you don't do it right top gear will burn out or break.  A T700 will require modification to the cross member to make it fit.

A T700 will struggle to last behind a 502 rat :)

I may have researched this subject previously :hammer:

demonx:
I was talking to a guy at work about this tonight and he suggested I dog box the Muncie and install a verticle gate. I may have to research what is involved in this and how practicle/streetable/durable it is and compare it to the auto option.

gtc:

--- Quote from: demonx link=topic=7828.msg1045937852#msg1045937852 ---I was talking to a guy at work about this tonight and he suggested I dog box the Muncie and install a verticle gate. I may have to research what is involved in this and how practicle/streetable/durable it is and compare it to the auto option.
--- End quote ---


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