901 4 and 5 speed question

[Chris Pomares]

Can a 4 speed 902/14 (69 912) main shaft with a H second gear be used in a 901/902/911 901 type 5 speed transmission? If yes can I put a 911/01 5 speed nose cone on the 902/14 and convert to a 5 speed?
I'd use the 70/71 911/01 but I've read a few threads that the clutch and shift fork pivot are tempermental.
I have both transmissions. My goal is to build a C, H, O, V, ZD, 7:31, Wavetrac TBD transmission for a 2.7 POLO that I think will make about 180 to 190 lbs of torque and 210 to 220 hp. I run A going to C, GA, N, U, ZD, 7:31, Wavetrac TBD in my 2.4 POLO.
Chris

[911quest]

You would be better off using a 904 mainshaft to get to where you want to end up. The four speed has first gear made on the mainshaft so you would be limited to that gear. If you can I would use the 901 aluminum case. The mag stuff is getting to the point were its all worn out. Intermediate plate bearing race and side cover issues. The bolt patteren between the mag and aluminum is different so the end covers cannot be swapped.

[Chris Pomares]

I guess I'll go with the GA second in the 911/01 5speed. It's a A I'll change to C, GA, O, V, ZA I'll change to ZD. And put it in a aluminum case 5 speed. I have access to one or two of those.
What is the value of the aftermarket side plate and intermediate plate as this engine will make more torque than a 2.0S makes hp. Obviously the owner will need to be kind to 1st gear with a 901.
Chris

[Jon B]

Can a 4 speed 902/14 (69 912) main shaft with a H second gear be used in a 901/902/911 901 type 5 speed transmission? If yes can I put a 911/01 5 speed nose cone on the 902/14 and convert to a 5 speed?
I'd use the 70/71 911/01 but I've read a few threads that the clutch and shift fork pivot are tempermental.
I have both transmissions. My goal is to build a C, H, O, V, ZD, 7:31, Wavetrac TBD transmission for a 2.7 POLO that I think will make about 180 to 190 lbs of torque and 210 to 220 hp. I run A going to C, GA, N, U, ZD, 7:31, Wavetrac TBD in my 2.4 POLO.
Chris

Chris, in addition to what Tony said, using a 4-speed mainshaft for a 5-speed transmission will put an "A" 1st gear in the 2nd gear position.
The front covers (nosecones) are the same for both the 902/14 and 911/01, except for the transmission mount stud lengths. Both transmissions have magnesium housings.
You cannot use a 4-speed "H" 2nd gear as a 2nd gear in a 5-speed, it can only be used as a 3rd gear.
Which transmission case to use depends on which clutch and flywheel you plan to use on your POLO engine.

Jon B.
Vista, CA

[Chris Pomares]

My understanding is 901/03 and 902/02 are 68 mag cases, correct? Weaker. I have a 901/02 66/67S Aluminum transmission I can use but I've been trying to avoid it as it would probably have some value to someone restoring a early car. What I'm after in the 911/01 transmission is the GA second gear as the H gear won't work out of the 902/14. The 911/01 is A, GA, O, V, ZA. I actually have O and V gears on my shelf. So if I could source a GA 2nd and a good aluminum case I wouldn't have to tear 2 transmissions apart to make one.
Any trades out there?
1 901/02, 2 902/02, 1 902/0, 1 901/03, 1 902/14, 1 911/01
Chris

[Jon B]

My understanding is 901/03 and 902/02 are 68 mag cases, correct? Weaker...

No, 901/03 and 902/02 transmissions have aluminum housings. Mag housings began in late November 68, for 69 model cars.

The mag housings are "stronger" in that they're less likely to flex or deflect under load, but the bearing bores can wear. The mag transmissions also have differentials with larger bearing journals, and use larger bearings.
If you're using a 225mm clutch on your engine, then you have to use a 70s mag housing. You also need to determine which axle flanges match the axles and the transmission you plan to use.

Jon B.
Vista, CA

[Chris Pomares]

1969 axles.
Would a late 914 transmission use the same axle flanges. The ring and pinion would need to be flipped.
I'm looking for a solution to get the gears I need. I have a late 914 transmission in my car with an 69 to 71 nose cone. My car is SWB and we had to get creative with the flanges. This car is a LWB car.

[Jon B]

What clutch & flywheel will you be using on the engine for this car?

Jon B.
Vista, CA

[Chris Pomares]

Jon,
Kennedy clutch and flywheel. 228 mm. Just talked to Dean the engine builder. I'm going to follow your and Dean's advice. I'll use a 904 main shaft, the 66/67 901/02 transmission and a H 2nd out of one of the 4 speeds. C, H, N or O, V, ZD. If I use the 901/02 am I going to have axle flange issues again as this is a 69 car.

[Jon B]

Jon, Kennedy clutch and flywheel. 228 mm. Just talked to Dean the engine builder. I'm going to follow your and Dean's advice. I'll use a 904 main shaft, the 66/67 901/02 transmission and a H 2nd out of one of the 4 speeds. C, H, N or O, V, ZD. If I use the 901/02 am I going to have axle flange issues again as this is a 69 car.

Chris, you cannot use a "228 mm" (225mm) clutch with a 901/02 transmission, and you cannot use an "H 2nd out of one of the 4 speeds" as a 2nd gear in a 5-speed, with any mainshaft.

Jon B.
Vista, CA