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Old 08-17-2011, 01:28 AM
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Difference between TRANSGO kits

Hi!

I'm building TH400 and have a question about TRANSGO kits.

Is there any difference between TRANSGO 400-1-2 (Automatic shift, street or full-race, holds 1st and 2nd to any rpm, backshifts to 2nd and 1st at any rpm) and TRANSGO 400-PRO (Holds any gear to any rpm and backshifts with the lever to any gear at any speed.) if I use both for just manual shifting?

I understand that 400-1-2 has automatic capability which 400-PRO has not, but if I use one or another in manual mode, are there any differences in shifting?

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Old 08-17-2011, 05:43 AM
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AT wide open throttle both setups will up shift the same, as you move the shifter to the next gear the trans will immediately up shift or downshift.

The exclusion is when moving at very low speeds. shifting from 1 to 2 will result in a slight delay unless and until you have reached a set predetermined
vehicle speed. (depends on specific govenor setup and rear gear ratio)
At all other speeds you have full immediate shifter controled upshift , downshift control.

The auto shift valve body or shift kit level is nice to keep for street driving.
In normal daily driving its nice to have vacuum modulated tamed down auto down shifts as the manual down shift from 2 to 1 is immediate and harsh when slowing down say for a traffic light in traffic.

A full manual down shift can tend to be harsh with a full manual valve body
as there is no line pressure modulation or shift accumulator buffering.

There will be no difference in WOT full throttle acceleration when manually shifted thru the gears with either setup The full manual valve body won't make you go any faster than the manual/auto street setup.

When approaching a traffic light andsloing down I like 3 to 2 manual down shift but liek to let the trans auto down shift 2 to 1 .

The forced manual 2 to 1 down shift is a bit harsher than you need most of the time in traffic. Be aware that if you need the engine braking deceleration from a manual down shift from 2 to 1 or from D directly to 1, it is full and immediate with no govenor override.

Its nice to retain the choice of either a manual shift or a tempered govenor and modulator regulated auto down shift with for normal civil street driving.

Its also nice to not have to shift it all the time. Sometimes/often it nice to let the trans do the shifting in normal street driving.

With a full manual valve body or shift kit, you don;t have that choice.

There will be no difference in WOT full throttle acceleration when manually shifted thru the gears with either setup The full manual valve body won't make you go any faster than the manual/auto street setup.

Last edited by F-BIRD'88; 08-17-2011 at 06:02 AM.
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Old 08-17-2011, 06:24 AM
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Full manual full time full line pressure bang up and down shifting is very hard on the axles, ring and pinion, differential and transmission. The whole car will last a lot longer with the manual/auto trans in a car that sees much normal street driving.

A full manual valve body trans can "get old" after the initial novelty has worn off, in a street driven car.

The manual/auto shift shift kit level gives you all the manual shift control you'll ever need for high performance street and strip and road racing driving but with the choice and civility/"drivability" of a automatic transmission.
The transmission life is extended.
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Old 08-17-2011, 06:34 AM
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Thanks for explanation.

I'm making my car mostly for drag racing and therefore it will see no (or minimal ) street driving.

On my opinion the auto shift valve body is a better choice, but I have a concern about vacuum modulator and his operation under conditions when engine runs in boost. What happens then?

I'm thinking that it would use the manual valve body and disable vacuum modulator.
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Old 08-17-2011, 06:41 AM
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There is another cool shift feature you can employ with the manual/auto shift kit or valve body that you cannot do with the full race manual valve body.

By carefully setup of the trans governor (its adjustable)

You can set up this transmission to auto up shift at a pre determined rpm @
WOT.

Set it up to auto shift at 6000 rpm, leave the shifter in D and rug it. It will do all the shifting and shift on time every time @WOT thru the gears.
Great for Bracket racing consistantly or Nitrous passes where you might
"miss a shift" or shift too late.

B&M sells the trans governor service kit that allows you to tune the trans governor and WOT up shift rpm @ WOT.
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Old 08-17-2011, 06:47 AM
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Quote:
Originally Posted by _BANDIT_
Thanks for explanation.

I'm making my car mostly for drag racing and therefore it will see no (or minimal ) street driving.

On my opinion the auto shift valve body is a better choice, but I have a concern about vacuum modulator and his operation under conditions when engine runs in boost. What happens then?

I'm thinking that it would use the manual valve body and disable vacuum modulator.
There is no reason to disable the vacuum modulator for supercharged applciations. Just add a inline one way check valve in the vac modulator vac line or swap the vac modulator for a cable/ controled version used on GM Diesel engines w auto trans. Its a GM part . Any trans shop can get one and uses a TV cable to control it like the TV cable of a TH700r4 Either way, gets it done.
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Old 08-17-2011, 07:42 AM
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Quote:
Originally Posted by F-BIRD'88
There is no reason to disable the vacuum modulator for supercharged applciations. Just add a inline one way check valve in the vac modulator vac line or swap the vac modulator for a cable/ controled version used on GM Diesel engines w auto trans. Its a GM part . Any trans shop can get one and uses a TV cable to control it like the TV cable of a TH700r4 Either way, gets it done.
Hmmm, that's good idea. Thanks!

Is there any difference between the this two variants?

If they are equivalent, then the check valve option is better due to simplicity.
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Old 08-17-2011, 11:00 AM
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TransGo sells a Kit for Boosted Apps.
Part #VBP-VAC >> http://www.transgo.com/tough_stuff.php about $30.

There's a Pic of it here about 1/2 way down page>> http://www.turbobuick.com/forums/tra...ictures-5.html

Lots of 400 Build tips from Pro Builders in this thread, Converter Feed restriction, Info on TransGo Kits= above 500HP their Duel Feed method is not sufficient, needs to be done Internally according to Jake/Jakshoe.
http://www.turbobuick.com/forums/tra...-pictures.html
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