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KnightoftheRound

To people with experience with the Datsun Comp. 5 speed, need parts for one

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Well i got mine out and apart... all the syncos are missing at least 2 teeth and 2nd is shredded. i have decided to let this one go as i really need an O.D. 5th. I will put it up in the for sale section in a few days but thought i would offer it up here first as it does qualify as "parts". In the car it would grind into 2nd, grind against reverse coming out of 5th, and occasionally pop out of 4th. I don't know anything about transmissions but this one looks fairly nice to me, i believe someone has rebuilt it before as the forks look to have double role pins. i have no idea what its worth, one guy told me i would be lucky to get $200 and another not to take less than $700, but neither wanted it.

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Here is what I found out today:

 

I took one of my gears, along with my dat-comp operating sleeve and the modified 240Z 4-speed fork I got from Sam.

 

IMAG0310.jpg

 

As you can see, the Porsche ring (left), has a smaller groove than the Datsun one (right), so the only way to know was to try to stick the fork on.

 

IMAG0311.jpg

 

Which ended in fail because the groove is too small. I was recommended to just have the groove machined out, as its a very minimal clearance issue.

 

Now, I haven't attempted to order the new operating sleeves (what Porsche calls them), but Don showed me the company he got them from last time he needed one, and its $220 or so EACH.

 

The transmission to source them from is a "Porsche 901 5-speed", he didn't give me a year, and I had forgotten to ask, if it matters. The Porsche ring fits nice and tightly over the gears though, which is nice.

 

Next step is to get new op. sleeves and fix the bent shift rod and put it back together and see how it works.

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Hi

 

I´m try to found opt1 or opt2 DIRECT DRIVE gear box to my historic rally car and found that way this topic. When I loked pictures in this page and previous, those where are showing all gears and plate between covers, I think both of these gear box´s are OVER DRIVE type. If I look these from front of gear box, The gears are: Main drive gear(4th) , 3th gear, 2nd gear, 1st gear, plate between , reverse gear, 5th gear. I think this box has normal shift patern: 1st up left and OD 5th up right and reverse down right. DIRECT DRIVE ( 5= 1/1) has patern: 1st down left and reverse up left.

 

What are you people think about that?

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I know this is an old discussion, but I picked up on it from a customer. The transmission shown is not the Direct Drive box, but rather the much more common FSC5C71B, or more commonly known as the steel servo Comp. box. If the owner wants to know what he has, he can contact me at Pettersen Motorworks 530 895-3606 during the business day. Please count the tooth counts on the first gear (main shaft), and the first gear (countershaft). That will tell me which ratio gear set it has. If the gear set is in usable shape, I've got pretty much any part it could need. Let me know, Steve Pettersen

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57 minutes ago, datsnut said:

I know this is an old discussion, but I picked up on it from a customer. The transmission shown is not the Direct Drive box, but rather the much more common FSC5C71B, or more commonly known as the steel servo Comp. box. If the owner wants to know what he has, he can contact me at Pettersen Motorworks 530 895-3606 during the business day. Please count the tooth counts on the first gear (main shaft), and the first gear (countershaft). That will tell me which ratio gear set it has. If the gear set is in usable shape, I've got pretty much any part it could need. Let me know, Steve Pettersen

 

It'll be either an F5C71-B (5-speed, Direct Drive) or FS5C71-B (5-speed, Overdrive), because there's no such thing as an "FSC5C71B".

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