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GoHashiriya

ER34 GTT - 71C to 30A Transmission Swap Parts Confirmation

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Posted (edited)

Hi all,

I've been recently getting back on track in the 34 and figured it was time to take the plunge and upgrade the gearbox. 

I bought the car late last year, it was originally an auto, though the previous owner (or one of) swapped the gearbox with the less-than-adequate RB20det box. This month I have been accumulating parts to convert it to the 30A transmission; bought the 34 tailshaft from the UK for pretty cheap as they're going for 100,000JPY ($900-ish) here (Japan) and this week placed an order for a new 30A from Nissan.   

The good news is, a lot of the harder to source parts I already have from the previous swap. However, I'm not 100% clear on what I can keep and what needs replacing.

I know there's some funny business involved with getting the 32 mechanical speedo to work with the 34 one, but am not clear on what modifications would have been made and how to reverse them if necessary. From what I've read, the modifications take place on the sensor side. Although, I have come across information regarding calibration of the tachometer.

Will the master cylinder / lines be reusable for the new transmission?

I've put together the following list, and it would be great if someone could point out anything I'm missing.

 

Component Part Name / Number Unit Price Shipping Total
Transmission FS5R30A 32010-AA520 ¥214,000 ¥15,000 ¥229,000
Propeller Shaft Nissan 37000AA500 ¥39,313 ¥30,000 ¥69,313
Clutch EXEDY ER34 Clutch 3-piece set 30210-AA001 30100-AA068 ¥42,350 ¥880 ¥43,230
Flywheel NA     ¥0
Spigot Bush NA     ¥0
Shifter Nissan 32839AA501/32839AB000 ¥5,387   ¥5,387
Clutch Master Cylinder ?     ¥0
Clutch Slave Cylinder Nissan 3062012U20 ¥10,753   ¥10,753
Clutch Master - Slave Lines ?     ¥0
Pedal Assembly NA     ¥0
Transmission Oil       ¥0
Clutch Fluid       ¥0
Labour   ¥100,000   ¥100,000
Resale (old parts)       ¥0
Total   ¥411,803 ¥45,880 ¥457,683
Edited by GoHashiriya
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You'll likely need a throwout bearing for the clutch, if it doesn't come with the clutch.

You'll likely need the correct transmission crossmember. The one that's under the RB20 box is probably the wrong one. They are stamped A, B and C. You can usually grab one of each from a wrecker/workshop and work out which one is needed then take the others back.

The clutch MC should work. It would be hard to believe that they put an R32 MC in there when the right thing to do in the first place would have been to put in a 34 one. Not that it should make much difference in how it works anyway.

Just get a new braided clutch line to replace the hardlines anyway. Easier and better than keeping and worrying about the old one.

The speedo is possibly a no brainer. The RB20 box has a mechanical drive via cable to a mechanical speedo head. If you have an electronic speedo head in the R34, then there's no mechanical drive. So it would be more likely that someone found an electronic sender to fit the 20 box. That's not a common thing to do, because no-one really does the conversion that you have. All the knowledge is around making a hybrid drive from a Navara to suit the big box in an R32 to drive the mech speedo. You need to work out what you have in the way of a speedo drive and head to work out what you need. If you have an electronic setup now, then all you're going to need is the appropriate speedo drive for the box. Of course, the calibration might not suit the speedo head, seeing as it originally used to work with whatever automatic speed sensor used be in there. The tacho has NOTHING to do with any of this.

You should do some searching on here for the thousands of words I have written on speedo setups for these cars.

 

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On 6/18/2021 at 4:58 PM, GTSBoy said:

You'll likely need a throwout bearing for the clutch, if it doesn't come with the clutch.

You'll likely need the correct transmission crossmember. The one that's under the RB20 box is probably the wrong one. They are stamped A, B and C. You can usually grab one of each from a wrecker/workshop and work out which one is needed then take the others back.

The clutch MC should work. It would be hard to believe that they put an R32 MC in there when the right thing to do in the first place would have been to put in a 34 one. Not that it should make much difference in how it works anyway.

Just get a new braided clutch line to replace the hardlines anyway. Easier and better than keeping and worrying about the old one.

The speedo is possibly a no brainer. The RB20 box has a mechanical drive via cable to a mechanical speedo head. If you have an electronic speedo head in the R34, then there's no mechanical drive.

 

Appreciate this alot! 

From what I can see the R34 AT/MT crossmember is the same - going by part numbers. I did find some information amidst the leagues of info on this site that said the RB20 box will fit the AT R34 crossmember (potentially was an R33) but you would only be able to utilise two bolts to mount it. I'll double check this. Thanks for advising on the crossmember identifiers.

I'll expect to do some dismantling of the speedo sensor and a bit more digging when we do the swap.   

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