# Low Partrol - Air Ride + Full Build On Undercover Cop Cruiser **URL:** \ **Category:** Builds\ **Created:** [January 19, 2011, 11:42am UTC](https://forums.speedlife.net/t/low-partrol-air-ride-full-build-on-undercover-cop-cruiser/256514 "2011-01-19T11:42:41Z")\ **Posts on this page:** 1\ **Showing post:** 162
**Author:** ![ClairFBeeIII](https://avatars.discourse-cdn.com/v4/letter/c/5daacb/32.png) [@ClairFBeeIII](https://forums.speedlife.net/u/ClairFBeeIII)\ **Post date:** [January 24, 2011, 10:32am UTC](https://forums.speedlife.net/t/low-partrol-air-ride-full-build-on-undercover-cop-cruiser/256514/162 "2011-01-24T10:32:00Z")
The only way to do it 100% is with a housing jig… Although I have seen people do it the way your mentioning…Another good DIY way is with round tubing that slides through the housing…It has to be exactly the diameter of the axle opening (for tapered housings) with the tube through the housing you can cut and slide pieces around without messing with the alignment too bad… (not sure if i explained that so you can visualize it) There are also other things to take into account…For cars that are going to be high HP drag style… some people set the axle housings pre loaded for torque… Its twisted and only truely aligned when the foot is down on the gas… > [@Biker Boys - R1 Paintjob](https://forums.speedlife.net/t/biker-boys-r1-paintjob/39049/3): > > How do you usually narrow a rear? I did my first one 2 weekends ago, ford 8.8. We did the math to get the axle tubes the right length we wanted (its an offset dif) then put it on the chop box. made out cuts, beveled and then used 2 pieces of C channel and clamped them together nice and tight to keep it aligned. Tacked it then tacked on some 1/4" plate in 4 places around it standing up to make gussets so heat didnt warp it. Just would like to know how you pull it off and compare strategies. --- _[View the full topic](https://forums.speedlife.net/t/low-partrol-air-ride-full-build-on-undercover-cop-cruiser/256514)._