Rb25det S15 swap gearbox mount - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Green Machine · 08-23-2019, 11:54 PM

Hello,

Im currently part way through a rb25det neo swap into my S15 silvia.

Car was factory sr20de auto but was manual converted previously.

I am using r33 front subframe and engine mounts and am using the stock sr20de gearbox with a rb20de bellhousing to make the box the same as a factory rb20det small box.

My issue is the gearbox is sitting around 1.5inchs further back than factory location so the mount doesnt fit and the driveshaft is too long.

Everything I read online said using this small box means I can retain factory driveshaft without mods. Was this wrong?

Is there a different crossmember I could use? How can I use factory driveshaft??

Thanks

S14rebuild · 08-30-2019, 07:48 AM

Issue is using r33 crossmember. Thats why everything is pushed back. I know for a fact rb20 trans will work stock location/mount n driveshaft. Just use oem subframe n make custom mounts/or find some that sit in proper location

08-23-2019, 11:54 PM	#1
Green Machine Join Date: Aug 2019 Location: New Zealand Posts: 1 Trader Rating: (0) Feedback Score: 0 reviews	Rb25det S15 swap gearbox mount Hello, Im currently part way through a rb25det neo swap into my S15 silvia. Car was factory sr20de auto but was manual converted previously. I am using r33 front subframe and engine mounts and am using the stock sr20de gearbox with a rb20de bellhousing to make the box the same as a factory rb20det small box. My issue is the gearbox is sitting around 1.5inchs further back than factory location so the mount doesnt fit and the driveshaft is too long. Everything I read online said using this small box means I can retain factory driveshaft without mods. Was this wrong? Is there a different crossmember I could use? How can I use factory driveshaft?? Thanks

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08-30-2019, 07:48 AM	#2
S14rebuild BANNED Join Date: May 2019 Location: Florida-FAIL Posts: 2,497 Trader Rating: (8) Feedback Score: 8 reviews	Issue is using r33 crossmember. Thats why everything is pushed back. I know for a fact rb20 trans will work stock location/mount n driveshaft. Just use oem subframe n make custom mounts/or find some that sit in proper location