subyrex 0 Report post Posted September 2, 2012 Anybody know the correct diff ratio for a getrag 250 ? from what I understand its ment to be a 3.45 Quote Share this post Link to post Share on other sites
BM WORLD 1283 Report post Posted September 2, 2012 Anybody know the correct diff ratio for a getrag 250 ? from what I understand its ment to be a 3.45what model and year is the car???318is use a small case 3.45 etc and maybe 320i use the same 318ti use a small case 3.38 325i use medium case 3.15 or are you talking about some other model?? e34 ?? Quote Share this post Link to post Share on other sites
subyrex 0 Report post Posted September 2, 2012 what model and year is the car??? 318is use a small case 3.45 etc and maybe 320i use the same 318ti use a small case 3.38 325i use medium case 3.15 or are you talking about some other model?? e34 ?? Yeah sorry should have said, its a e34 model. Has the original Auto diff (unsure of ratio) and have now got a getrag 250 in it. Revs i bit on the highway and 1st is pritty much useless. Just would like to know what ratio would suit. Quote Share this post Link to post Share on other sites
BM WORLD 1283 Report post Posted September 3, 2012 Yeah sorry should have said, its a e34 model. Has the original Auto diff (unsure of ratio) and have now got a getrag 250 in it. Revs i bit on the highway and 1st is pritty much useless. Just would like to know what ratio would suit. yea look for 3.15 or 3.23(i can get one that will bolt in approx $300+) or 2.97 same ratio's arnt easily got hold of for a e34 so you might have to make one up Quote Share this post Link to post Share on other sites
polley 916 Report post Posted September 3, 2012 Just decide where you want to be revving @ 100kph of whatever, do some maths, and you will know what ratio to look for.. Quote Share this post Link to post Share on other sites
subyrex 0 Report post Posted September 3, 2012 (edited) yea look for 3.15 or 3.23(i can get one that will bolt in approx $300+) or 2.97 same ratio's arnt easily got hold of for a e34 so you might have to make one up Sourced out a 3.15 210mm out of a large case e34 diff so will probably go with that. Thanks again. Edit: The 210mm Large case was only fitted to the M5 and 540i e34's all the others had the 188mm medium case diff (Just for future reference as i found little info about this online) Just decide where you want to be revving @ 100kph of whatever, do some maths, and you will know what ratio to look for.. Yeah, done all that just wanted to know what the original ratios where for the box. Edited September 16, 2012 by subyrex Quote Share this post Link to post Share on other sites
