Keep blowing boxes

[ph4t32]

R32

[ph4t32]

Hey guys i have a widebody r32 with 285's all round with 25ml spacers on back and a r34 neo engine with the 33 box and twin plate clutch making 340 on 20psi, and my boxes last maybe 100kms and start whining and another 100kms and 3rd gear has gone 3 times, ive done 6 axles and a half shaft in just under 5000k's and a centre bearing and clutch had to be sent away to be done because it started slipping.... my question is can any body help as to why im doing it?? i didnt clutch kick thor this box or drop it in 2nd or 3rd just fed it on and after 100k,s its whining already, it had a 2way cussco in it and i swapped it for a locked diff and need some ideas on what to check e.g gearbox and diff aligned right, measurements, heights, crossmember, etc etc ive read maybe its the clutch is to harsh. i think its a extreme brand i know its a twin plate, and is there anyone in vic i can take it to that can help me??? My mates box in a 33 lasted over a year with 530rwkw smashing it and it still hasnt blown, im on 3rd box and am its about to blow, im over it and need help pls guys,

[ph4t32]

[ph4t32]

[MrStabby]

If the clutch is solid center, try a sprung center instead. What oil are you using?