View Full Version : DIY: JH Motorsports 4:1 Center Differential Install for 02X 6-Speed M/T

11-19-2010, 04:47 PM
hey a'ziners - we just performed our 4:1 center differential upgrade (http://jhmotorsports.com/shop/catalog/jhm-41-center-diff-upgrade-manual-trans-only-p-46.html) on our newest employee's 2004 B6 1.8t quattro 6 speed avant. check out this write-up to see how you can remove and re-install your diff to get this awesome upgrade!!! Your B7 A4's share the same transmission, the 02X.

**note: this write up is for the 2004 and up 6-speeds only (02x transmissions) only, however the concepts are 80 to 90% the same for all Audi Manual Transmission cars with quattro. The main difference is that V6 or V8 cars need to have the exhaust partially removed to gain access and the diffs look different. Also the 5-speed B5-B6 A4s are very similar except that the center diff comes out with the rear housing and is stuck inside the housing, requiring removal of a hidden snap ring. If needed, you can send us your whole 5-speed tail housing in with the diff still in it and we will gladly take it out, modify it, and put it back in. Additionally, the 02 and 03 6-speeds in the 3.0l cars are 01E transmissions and have the same bolt sizes as the ones depicted in this write up. In order to remove the diff you just need to unbolt the exhaust to get it out of the way. The tail housing is shorter on these transmissions and includes a cap and a spring that is in the cap along with some shims that must not get lost.**

alright. let's begin!











http://jhmotorsports.com/tech/B6-B7_A4/6-speed_MT_Center_Diff_Install/11_make_sure_space_of_diff_is_same_as_dissasembly. jpg




that should be everything! we stock all of the driveshaft bolts and gaskets featured in this write up as well as the above mentioned redline mt-90 transmission oil.

let us know if you have any questions. you can email us at sales@jhmotorsports.com. enjoy those twisties!

Sly Raskal
11-21-2010, 01:10 PM
Very nice write-up!

11-22-2010, 07:35 PM
Great write up guys!

11-30-2010, 12:19 PM
Very nice write-up!

Great write up guys!

hey guys, we appreciate the feedback!

just to let you know, we're having a sale on these diff upgrades as well as on many of our other JHM branded products. check out this thread (http://www.audizine.com/forum/showthread.php/399752-JHM-Holiday-Sale!-quot-SOLID-quot-SHIFTERS-10-OFF!-MANY-other-ITEMS-up-to-15-off!) for all of the details.

let us know if you have any questions!