Max sump under car.

[robo]

7ishnz have you ever seen our roads? The unmade ones in the aussie outback are smoother.Potholes that people abseil down and speedbumps through towns that people with vertigo have to avoid. Are you sure 2" is ok?

Bob

[AshG]

my sump is about an inch below the bottom chassis rail. the gb is about 1 1/4 inch lower than the bottom chassis rail. i have managed to touch the gearbox down a couple of times when pressing on over bumpy roads.

personally i would say any more than an inch under the chassis rail is going to end in tears at the side of the road

[MarkB]

Better if you can have it level with chassis rails, as Ash mentions DON'T go lower than an Inch or you risk taking a chunk out of it on our crap roads!!!

[7ishNZ]

The best solution is sump level with the chassis. This is not usually possible even with a dry sump, as the bellhousing will now be the lowest point.
The best result is a compromise between bonnet height and bellhousing. 3" clearance under the sump/ bellhousing is the usual for 7's here... some have more, some less.
If you are worried, make a skidplate that will protect both the sump and the bellhousing.
Alternatively... fit airshocks

[AshG]

i made sure my bellhousing was a little bit lower than the sump and it turned out to be a good idea as if i clout the bellhousing it tends to stop the car going any lower and catching the sump

[Cyberbeej]

Surely it all depends on the standing still height off the road and the travel on the shocks till it bottoms out.

I mean, lets say you have 125mm floor to chassis gap and a travel on the shocks of 100mm, going on the theory that your suspension should be set at half way in the 100mm travel (50mm) that leaves you 75mm clearance at full suspension compression.

Just adjust the figures and that will show you whats available for your sump/ bellhousing.

Does this make sense????

[AshG]

end of the day i have got 120mm ground clearance and i can touch down a little on really bumpy roads with dips and crests