Evo30 6 Report post Posted May 23, 2014 Hi. Removed this diff from donor e30 which had a Toyota 1.8 turb. The car shell is originally a 320i but it seems have had a pretty modified history. Not sure if this was the standard diff or replaced. Any help appreciated cheers Quote Share this post Link to post Share on other sites
E30 325i Rag-Top 2957 Report post Posted May 23, 2014 There should be a small silver tag on the back cover, held on by one of the bolts. Numbers on that will tell you what ratio it is. Usually covered in oil and crap, so needing a clean before you can read what it says! Quote Share this post Link to post Share on other sites
Eagle 1662 Report post Posted May 23, 2014 Std E30 small or medium case diff. 6 bolts on rear=small, 8=medium Quote Share this post Link to post Share on other sites
Evo30 6 Report post Posted May 23, 2014 How can I tell what ratio? Or would I have to remove the back cover? Tags I can see are: 1 210/23 W / 03 255 Quote Share this post Link to post Share on other sites
Evo30 6 Report post Posted May 23, 2014 Couldn't find the small silver tag on the diff. I did find another stamp closer to the hub. 1210 421 Quote Share this post Link to post Share on other sites
Eagle 1662 Report post Posted May 23, 2014 Possibly a 4.21 then. Easy to rotate it and count it out. Quote Share this post Link to post Share on other sites
Driftit 2078 Report post Posted May 23, 2014 (edited) Turn the drive shaft. Count how many times the axle turns for one revolution. Edited May 23, 2014 by driftit Quote Share this post Link to post Share on other sites
Evo30 6 Report post Posted May 24, 2014 Cheers 4.21 it is. Can I bother you guys with another part? Another gearbox removed not sure of origin. Quote Share this post Link to post Share on other sites
Evo30 6 Report post Posted May 24, 2014 Was from an e30 325 but not sure if this one is a 260? Quote Share this post Link to post Share on other sites
