RustyBrat Posted June 12, 2014 Share Posted June 12, 2014 i cant decide if i want to weld the rear diff on my 78 subaru brat. it has a 4 inch lift, and i run 27-29 inch tires on it. i primarily use it off-road, but it does see occasional highway driving and around town. if i weld the rear diff, i know it will help a lot off-road, but im afraid that when i drive in on pavement i will break axles or the diff itself. i know some people weld the diff, then remove an axle for street driving... but that sounds like a pain to do all the time. what are your experiences with welded diffs? should i do it? Quote Link to comment Share on other sites More sharing options...
Uberoo Posted June 12, 2014 Share Posted June 12, 2014 (edited) Weld it,Over inflate your rear tires for street driving,drive it fast around turns so there is less force on each axle,finally when turning from a stop turn as wide as you can to again minimize the stress on rear axles.I will say though that actually blowing a rear axle or the diff on the street is rare unless you pull the front axles for RWD shenanigans... However,it is not advised to weld it with a 110 welder,unless you can heat the spiders to a dull red with a torch to get more penetration. also when your driving on a slow curvy paved road (sub 35 MPH) it can help if you intentionally drop one of the rear tires into the dirt. Edited June 12, 2014 by Uberoo Quote Link to comment Share on other sites More sharing options...
RustyBrat Posted June 12, 2014 Author Share Posted June 12, 2014 i appreciate the input so its not that big of a deal on pavement around town? i have access to a 220 mig welder, that should do the trick right? also, im going to be running some deep tread tires, does that make a difference? Quote Link to comment Share on other sites More sharing options...
Scott in Bellingham Posted June 12, 2014 Share Posted June 12, 2014 real light rig Ive done it, don't carry a big load in the back , Quote Link to comment Share on other sites More sharing options...
Uberoo Posted June 12, 2014 Share Posted June 12, 2014 other than tire noise its not a problem because the rear axle is just dragged through corners without power being sent to it. Quote Link to comment Share on other sites More sharing options...
RustyBrat Posted June 12, 2014 Author Share Posted June 12, 2014 Alright awesome! I will weld it asap! Thanks guys Quote Link to comment Share on other sites More sharing options...
ironworkerboomer Posted June 14, 2014 Share Posted June 14, 2014 (edited) I picked up a spare rear diff to weld so if I screwed up and it breaks, I could plug in the original. Edited June 16, 2014 by ironworkerboomer Quote Link to comment Share on other sites More sharing options...
RustyBrat Posted June 14, 2014 Author Share Posted June 14, 2014 i'd like to do that if i can find one on the cheap Quote Link to comment Share on other sites More sharing options...
Legacy RallyGuy Posted July 9, 2014 Share Posted July 9, 2014 i'd like to do that if i can find one on the cheap I have a 3.9 diff laying around in Missouri... I could have a friend ship it if you're interested Quote Link to comment Share on other sites More sharing options...
RustyBrat Posted July 9, 2014 Author Share Posted July 9, 2014 im actually thinking about ditching the brat project.. but i will let you know if i change my mind, thanks Quote Link to comment Share on other sites More sharing options...
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