dizzle Posted January 11, 2010 Share Posted January 11, 2010 Has anyone rebuilt an rb20 trans. I have one hooked to my rb25det and I feel that she is on the way out. I am getting excessive noise under cruising, like the bearings are a little worn. And if I am hard accelerating it doesn't go into 2nd very well. I know that the KA and the RB20 trans are very similar, but will a rebuild kit for a KA trans have the parts I will need to fix my RB20 trans? Thanks for any advice... Quote Link to comment Share on other sites More sharing options...
amorfin Posted January 11, 2010 Share Posted January 11, 2010 Sorry for not answering the question, but why not just go with the RB25 trans? It's stronger, should last you longer, and gives you room for future increases in power. Quote Link to comment Share on other sites More sharing options...
dizzle Posted January 11, 2010 Author Share Posted January 11, 2010 I wish... But money is tight and if I went rb25 trans i would have to get a new driveshaft and mount as well. It would surely be the best option if i had the money though... Quote Link to comment Share on other sites More sharing options...
wax Posted January 11, 2010 Share Posted January 11, 2010 The rb20 transmission will never survive with the rb25det , its the torque that destroys them. Quote Link to comment Share on other sites More sharing options...
kiwi303 Posted January 12, 2010 Share Posted January 12, 2010 The 2wd RB20DET trans here is the FS5W71C, Same as fitted to RB30e commodores as well. Since read on here your KA24DE trans is a FS5W71C, I can't see why the kits shouldn't be interchangable. The only real difference I would expect to find is the bell housing casting. Quote Link to comment Share on other sites More sharing options...
dizzle Posted January 12, 2010 Author Share Posted January 12, 2010 I will have to look where to get a rebuild kit and how much they are... Quote Link to comment Share on other sites More sharing options...
Careless Posted January 12, 2010 Share Posted January 12, 2010 someone on here held up with 444whp from an SR20 on an FS5W71C, and I believe Enjuku held one for some time with a 550+whp SR20. SR20's make a torque equivalent to the hp, so it shouldn't be TOO bad on a stock 25. Quote Link to comment Share on other sites More sharing options...
linluv84 Posted January 12, 2010 Share Posted January 12, 2010 someone on here held up with 444whp from an SR20 on an FS5W71C, and I believe Enjuku held one for some time with a 550+whp SR20. SR20's make a torque equivalent to the hp, so it shouldn't be TOO bad on a stock 25. Same logic I was thinking. I'm going to try to go with an RB20 trans for my swap... Quote Link to comment Share on other sites More sharing options...
wax Posted January 13, 2010 Share Posted January 13, 2010 Go for it see how you get on. You can make any gearbox last behind any engine as long as you are careful. Personally I would rather not be sitting on the side of the road with a box full of neutrals waiting on a two truck. Quote Link to comment Share on other sites More sharing options...
Careless Posted January 14, 2010 Share Posted January 14, 2010 Same logic I was thinking. I'm going to try to go with an RB20 trans for my swap... If I ever get the RB30DE going, I'm definitely going to use the 240sx gear housing and the RB20 bell housing. I don't think the engine will have the torque to kill those boxes if they're in good shape to begin with, and I can find a KA24 box pretty cheap, so I will have a driveshaft already matched. It would also make the car lighter and parts are easier to come by. My FS5R30A is starting yell at me from time to time... I can't find a replacement. Quote Link to comment Share on other sites More sharing options...
linluv84 Posted January 14, 2010 Share Posted January 14, 2010 I've seen guys drift on SR gearboxes with 400+hp, I dont see how I'll be able to stress it on 225 tires with a stock RB25det... Quote Link to comment Share on other sites More sharing options...
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