Pro shift 1/2

Discuss VW transaxles and transmissions. Gearheads wanted!

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wankelbug
Posts: 26
Joined: Wed Jul 29, 2009 3:55 pm

Pro shift 1/2

Post by wankelbug » Sun Jun 18, 2017 6:33 am

The car
1970 beetle
13b rotary turbo. Eat 325-375 hp
1900lbs
Gearbox 5 rib bus, weddle guts. 4.56 R/p.
Shift rpm 8000rpm
Clutch rev 6 2disc

I recently had the transmission upgraded to a spool (broke the super diff ) and while in there I had the 1/2 upgraded to pro shift. The car is just used for grudge racincing at the track and sometimes on asphalt. I have never had a pro shift trans but I decided to try it since my 1/2 shift has been giving me issues because of the high rpm shift point. I left 3/4 synchronized because the car is street driven occasionally and needs to be for "street legal no prep racing" . My question is under full boost at the top of first can I shift 2nd without clutching or lifting? I have the option of momentarily cutting the spark during my shift to unload the gear, could I use that and no clutch to shift? How long will the pro ring last?

Casting Timmy
Posts: 79
Joined: Sun Nov 17, 2013 9:42 pm

Re: Pro shift 1/2

Post by Casting Timmy » Sun Jun 18, 2017 1:39 pm

I would talk to Folts about Liberty shifting it, it's a better set up.

Casting Timmy
Posts: 79
Joined: Sun Nov 17, 2013 9:42 pm

Re: Pro shift 1/2

Post by Casting Timmy » Sun Jun 18, 2017 1:42 pm

Dave posted this on his page along with some photos:

I am not sure how many of you are aware of liberty starting to make there face plate for use in the vw trans.They have been making them for the Honda trans axle for a while now.The problem is that they only make there parts for the early type 1 trans with a keyed style mainshaft.I went ahead and made 5 different style hubs that can use there some of there pieces for the bus 002 and 091 style and the 2d mendeola transaxle.You might ask why is this face plate better than the old pro ring style.I have been doing trans axle repair for some 38 years and the pro ring was used before i began.It is an antiquated system for the horsepower the cars are making now.Also with the pro ring system if you miss a gear you junk the slider engagement teeth and now the trans won't shift.The face plate inner splines are separate from the engagement dogs.There is a lot more surface area on the face plate dogs so they should last a lot longer in the long run saving money.The picture of the first and second is the face plates installed.They will be welded in place to keep them from spinning. I only showed the face plate parts for first and second but third and 4th can also be done.

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Pablo2
Posts: 363
Joined: Sat Jun 25, 2011 7:37 pm

Re: Pro shift 1/2

Post by Pablo2 » Thu Jun 22, 2017 11:21 pm

Since you have the ability, I would definitely employ the spark cut-out.
aka Pablo, gears, Geary
9.36 @ 146 in '86

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