Transmission question

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tom coughlin
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Transmission question

#1 Post by tom coughlin » Wed Jul 18, 2018 10:28 am

My 1955 got a transmission upgrade from a PO to a dual mount B tranny. Since I have bought back the original engine, I'd like to get the tranny a bit closer to original. For common sense reasons I'll retain the dual mount. I have a VW/519 empty case (which will need machining) but I understand that the later B gears really won't work in it. I think I need a 644 or 716 tranny for it's internals to build up the 519. I'm trying to understand what other potential problems may arise. Two things I'm concerned about are the intermediate plate and nose cone. What others need to be addressed?
Any advice from those with related experience is most welcome. Tom
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Jacques Lefriant
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Re: Transmission question

#2 Post by Jacques Lefriant » Wed Jul 18, 2018 11:10 am

Hi Tom
first question is your car a 1956 model? if so it would have had a 519 transmission with a dual mount. even though you have a B 741 trans now it may have a 644 nose cone. personally i would not do what you are proposing.
j
 

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tom coughlin
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Re: Transmission question

#3 Post by tom coughlin » Wed Jul 18, 2018 12:17 pm

It is a May 1955 production date bent window. Why wouldn't you do this? Tom
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Jacques Lefriant
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Re: Transmission question

#4 Post by Jacques Lefriant » Wed Jul 18, 2018 5:20 pm

Hi the tunnel case is an upgrade to split case even if you machine a VW case it won't be as strong or last as long. people are telling you to start off with the VW case because all the Porsche ones are worn out now.
j
 

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Vic Skirmants
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Re: Transmission question

#5 Post by Vic Skirmants » Thu Jul 19, 2018 8:02 am

741 internals will certainly fit a 519 case.

chuck pridham
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Re: Transmission question

#6 Post by chuck pridham » Fri Jun 21, 2019 4:25 pm

Installing the origional 519 split case transmission into my early 1956, T1 and question if adding steel cans over the new front mounts help to reinforce the rubber.

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Vic Skirmants
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Re: Transmission question

#7 Post by Vic Skirmants » Fri Jun 21, 2019 10:27 pm

chuck pridham wrote:
Fri Jun 21, 2019 4:25 pm
Installing the origional 519 split case transmission into my early 1956, T1 and question if adding steel cans over the new front mounts help to reinforce the rubber.
Yes; that's why Porsche did it.

chuck pridham
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Re: Transmission question

#8 Post by chuck pridham » Sat Jun 22, 2019 12:24 am

Thanks Vic, I'm going with the upgrade and installing the cans.

MICHAEL FOSTER
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Re: Transmission question

#9 Post by MICHAEL FOSTER » Sat Jun 22, 2019 10:57 am

The early cars didn't use the cans and you will find adding cans will cause adjustment issues with shift linkage.

Michael Foster
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Mike Smith
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Re: Transmission question

#10 Post by Mike Smith » Sun Jun 23, 2019 4:35 am

We found that it was not possible to get the correct Toe-in on a 57 Car (100 017) when the cans were fitted

The car was set up to race and although we were using Harder `Rubber` Doughnut mounts, the cans help to stiffen things a little more

We resorted to extending the slots in the swing Arms


The car in question is the one in my Avatar at Goodwood
Mike Smith (Essex - UK)

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