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Old 04-22-2005, 01:44 PM
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Transgo Shift kit "stick mode" 700r4

Hi, you may remember me from Christmas with the 700r4 with slipping 4th gear only. During the tail of woe, I fitted a full manual TCI valve body...

Well gearbox expired yesterday, I was in traffic at the lights - just nudging forward, gearbox locked up briefly and then no drive in any gears.

Strange, except for a slight incident of me slamming it back into FIRST when I meant to put it into THIRD this was at around 40-50mph! (because my daily driver is tiptronic, and you press UP to go up a gear, whereas the 700r4 you press DOWN to go up )
So once ive pulled it apart to find out what I broke, ive got decide whether or not to put the manual VB back on or not..

Which brings me onto my question, if I refit the auto VB and fit the big transgo shift kit in stick mode, can you shortshift gears (i.e. change at 5000rpm instead of the governor changing it at 5500)

In the description says you can hold it in gear and downshift at any speed - but if you are holding it in 1st and then punch it into 2nd does it change instantly, or does it still refer to the TV & Governor to decide when to change UP ?

Oh, if anyone wants a stab on what could be broken inside after such a stupid action Ė Iím all ears (donít say the driver!)

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Last edited by eliotmansfield; 04-25-2005 at 04:08 PM.
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Old 04-22-2005, 03:56 PM
Steve Chryssos - 68 Camaro
 
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Elliot,
As you understand and are used to Tiptronic, I'd say it's time for a 4L60E and an electronic controller. All of the available aftermarket controllers offer manumatic shifting. You will never have to worry about accidental downshifts again. Just go into the software and enter a minimum speed for each gear in the downshift parameters (i.e. do not downshift into first gear above: 25 mph)
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Old 04-22-2005, 04:07 PM
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I'm aware of the electronic options. I'm currently running megasquirt, and someone is currently working on a version that will control a 4l60e - just needs a bit more development right now.
Ive been playing with the demo version of the TCI software, i like the way it works - but costs $700.
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Old 04-22-2005, 04:37 PM
Steve Chryssos - 68 Camaro
 
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Yeah, it's a chunk of change, but a fair value for computer, harness and software. Every time you car shifts just right--it's money well spent.
Here's a couple of others:

http://www.compushift.com

http://www.transmissioncontroller.com
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Old 04-22-2005, 04:43 PM
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Apart from Lance's megashift, somone told me the other day about another diy system, i think this is probably it:
http://www.no-bling.com/forum/index.php

eliot.
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Old 04-22-2005, 05:36 PM
Steve Chryssos - 68 Camaro
 
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Nice. Thank you.
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Old 04-24-2005, 12:25 PM
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the TV and governor will over ride the position of the shifter in upshifting.

IF the pressures and road speed are not what the valve body needs to up shift......... the tranny will not upshift, ie; short shift the tranny. A full manual v-body would needed

Down shifting is a different mode. You can down shift to 1st gear at 40 over riding the the TV & gov systems to force a down shift
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Old 04-24-2005, 12:35 PM
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Thanks Crosley, as ever the exact info I was looking for. Recall, its got the full manual on it right now - but as said - its not forgiving, I slammed it into 1st instead of 3rd. Which is why I was exploring the possibilities of having a hybrid.

Anyway, would appreciate any views on the resulting failure. What appears to have happened is that the two circlip grooves for both the forward and overrun clutches have been smashed out the aluminuim drum. Would this be an expected failure of putting it in the wrong gear at speed. The TCI VB kit comes with a new pressure regulator assly, which pegs line pressure at 300psi permanently.

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Old 04-24-2005, 05:04 PM
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that is a common high pressure failure. I've seen it many times in all of the big three RWD trannys

all trannys can do that when line pressure is too high...... too often
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Old 04-25-2005, 03:50 PM
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I want to fit the "torque drive" drum and shaft, given my 400+ ft/lb power.

From what ive read, it states that it fits a 87 upwards gearbox - mines an 85 box with a 30 spline shaft but no aux VB.

What's the difference, will it work?

Thanks,
Eliot.
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Old 04-25-2005, 08:30 PM
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yep.

late style aluminum drums are cut different heights for snap ring grooves.

use late snap rings, thickness is different.

Use the late stack up of steel plates and frictions.

use the late model forward sprag & race assembly.

use late design Forward pressure plate


Quote:
Originally Posted by eliotmansfield
I want to fit the "torque drive" drum and shaft, given my 400+ ft/lb power.

From what ive read, it states that it fits a 87 upwards gearbox - mines an 85 box with a 30 spline shaft but no aux VB.

What's the difference, will it work?

Thanks,
Eliot.
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Old 05-03-2005, 09:22 AM
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Interestingly, Ive had no response at-all from TCI about the drum failure with their manual valve body fitted to this box - beware?

Update-
Had a pretty lame reply from TCI saying that it's an old drum, probably would of broke anyway, of course not admitting that it had anything to do with the 300 psi line pressure...

Ive broke down a spare BOP patterned 700r4, got some more questions about parts interchange, will start a new thread.

Last edited by eliotmansfield; 05-03-2005 at 05:21 PM.
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