# rb20swap help

**URL:** <https://forums.speedlife.net/t/rb20swap-help/81618>\
**Category:** SON240sx Automotive\
**Created:** [September 17, 2004, 4:36am UTC](https://forums.speedlife.net/t/rb20swap-help/81618 "2004-09-17T04:36:12Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![laurieandmike](https://avatars.discourse-cdn.com/v4/letter/l/b9bd4f/32.png) [@laurieandmike](https://forums.speedlife.net/u/laurieandmike)\
**Post date:** [September 17, 2004, 4:36am UTC](https://forums.speedlife.net/t/rb20swap-help/81618/1 "2004-09-17T04:36:12Z")

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ok i have read and read about this  
some say i can use the stoch ka cross member  
some say i need r31 cross member  
and some say z31 cross member  
what is true and what is not  
i am a metal fabricator myself and could probally make mounts to fit the ka  
what i need to know is how far back in relation to ka mounts do it have to be for the rb?  
if i get this i can make sets real cheep for others also  
and will the z31 cross member work and fit the 240 no problem?  
thanks  
mike

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**Author:** ![Heatw](https://avatars.discourse-cdn.com/v4/letter/h/cdc98d/32.png) [@Heatw](https://forums.speedlife.net/u/Heatw)\
**Post date:** [September 17, 2004, 7:28am UTC](https://forums.speedlife.net/t/rb20swap-help/81618/2 "2004-09-17T07:28:57Z")

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i personally know people who have used the r32 member… the motor sits a bit high but other wise fine… and fortuneatly the rb20 doesn’t use a fat ass drive shaft like the rb25 so it goes in without making a custom one… and in the case of the guy i knew… his exhaust even lined up without issue  
you also need to by pass the hicas ps lines on the pump or maybe you can use some other pump, my buddy just looped it lol… but if you make rb mounts keep ppl posted i’m shure someone would want some