Technical Tips > Transmissions - Differentials

Differences in auto gearboxes

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revvedup:
any clues about locating a t/700 that ll fit into my 75 coupe 327  would be great ,ive read some horror stories about fitting them , im up to it , but im out the the middle of nowhere so i need all the bits  .

87Z51:
T700 first gear is sh#t unless you have a truck , run out of revs too fast.
Advantage of T700 is the overdrive 4th ; can run lower diff gears for accel  (which makes 1st gear worse) and still get great economy cruising.

revvedup
You want to replace the T350 with a T700R?
Your stock driveshaft is 3' to long but the yoke will fit.
The trans mount  pad will have to be moved back 2"
If you want TC lockup function you will need to get a switched 12V supply to the tranny.
Need to modify throttle linkage at carb to take TV cable from trans that controls shift points.
No vac modulator like T350.
Other than that it will bolt up.Have not seen one in a C3 so unaware of clearance isuses.

As stated in parts for sale , get a VN/VP V8 trans as a rebuildible core.Has correct mounting pad and from memory cable drive speedo .
A C4 T700 is a expensive option that requires more work.However you can put all the Vette goodies(servos) in a std case .How much Hp you making?
T700s are very fickle ,especially where big torque is involved.
Worth paying the money upfront for the good parts (input shaft  / sunshell , most common parts that break ) if you are going to drive it hard.
The VN/VP ones are the most popular for conversions  because they are pre-electronic so prices are relatively high v late elec T700.
In Sydney rebuild cores go $400 + , as pulled still working trans up to $900 but all high mileage so best to buy the cheapest and get it recoed to your specs.
Have pics if needed

TIPPA:
WOW... sounds like you know what you are talking about! I'd agree that a T700 is the way to go in a C3. A few club members are running this combo. I owned a VN HSV with one. At 100,000kms reverse started slipping so had it rebuilt. Extra clutches, kevlar (?) band, corvette servo piston, shift kit etc with 2,800 dominator lock up converter and trans cooler. Only lasted a month till it blew itself to pieces (said "line pressure" was too great in it). Second attempt with same mods and trouble-free trans that i was so impressed with i'll be fitting one to my vette too. A mate has one behind a 430hp SS and with similar mods hasn't given any dramas at all.
Heard they can handle up to 400hp when std (less than T400 of course and similar to T350?) but they can handle more with mods...
And overdrive is a GOOD thing...

77CVT:
TH700 1st gear = good burnouts!  :evil

Brutus:
I've got one sitting here that was supposedly built to hab]ndle a very high HP drag car. Don't have a converter yet but it's scheduled for the 77........one day.;ay

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