diff temp

[jerseyvixen]

hi how hot do/should a 7" ford diff get after half hour road driving .
it was to hot to put your hand on but not bakeing it that normal

[dan19evans]

Its normal for a diff to get warm, but if you think its overly hot then make sure you check the diff oil level, and check for any signs of leaks on the diff

[steve6304]

whgat car is it?
is it modified in any way?
how fast were you going ?
used to race a classic aston martin a long time ago and had the same problem, the inboard brakes caused the diff to overheat, fitted a cooler an all o.k

[jerseyvixen]

hi the diff is a 7" ford lsd unit from a 4x4 sierra
fitted in a tvr vixen exhaust is about 60mm away .
driven for 40 min spritely when checked it was to hot to put hand on

[CNHSS1]

nope, thats too hot in my experience of them. If its the original diff internals from the 4x4 Sierra, it will have viscous cartridge LSD fitted too. They dont like getting too hot either, and can cause the silicone fluid in the cartridge to break down, making the diff little more than an open diff, reduces the LSD locking action to near zero.
any funny noises that suggest too little backlash (whines) or possibly a bearing siezed/damaged?