How well do they hold in the dry? Will be for the driftcar.. Thinking of just welding it, will save a lot of hassle and it's already out.

Welding up a C series helical diff will make all Spyder/AW11 owners cry.
 
If you're that set on drifting one, just go and weld up a stock S54 single-pegger.
 
The helical diffs appear to lock up reasonably well, more-so under higher loads.  I have no issues stepping the back out on ours in the wet or dry.

EssDub
Welding up a C series helical diff will make all Spyder/AW11 owners cry.
 
If you're that set on drifting one, just go and weld up a stock S54 single-pegger.
 
The helical diffs appear to lock up reasonably well, more-so under higher loads.  I have no issues stepping the back out on ours in the wet or dry.

Sorry, would be welding the standard s54 diff. Alright, ill have a look into the spyder diff, but don't want to have to pull it back out again if its not holding it out. Thanks for the reply.