Gearbox dilemma

[Hanzonit]

I have a 88 toyota hilux that im dropping a 3.8 supercharged v6 holden motor in to.
Problem is that the supercharger is over-driven and is running 11psi instead of standard 8psi.
Therefore the standard T5 gearbox on the back of it crapped itself. What would be able to handle the torque? 

[flyingbrick]

Hey man.

Put another factory box behind it. I can not imagine that a gearbox would shit itself because of just a few psi in extra boost.

It was probably abused to hell

[slipsittin]

I agree with flyingbrick, that about the abuse.

What actually happened to the box?

[smokin'joe]

did the glass bearings fail ?

 

i would be inlcined to use a toyota box, w-50 maybe ?

[R100]

T5's are pretty tough boxes dude.  I doubt very much a V6 bombadore engine with 11lbs of boost would put out much more than 260hp. 

Id imagine your wheels will spin before anything breaks unless what was said above and your box has been thrashed to death or done very high ks.

[Hanzonit]

Crunches post gears and i think it was 2nd and 4th? that used to constantly whine as well. 

[Hanzonit]

most* not post

[kpr]

sounds tired. not broken, because too much power

[ta63-1uzze]

gearboxes that whine and crunch gears are screaming out for repair, if nothing is done of course its going to shit its self. if its making a "funny" sound its not going to get better or last like that for ever.

 

that being said, new bearing and synchromesh units you might be away laughing once again .  I have repaired many gearboxes in my time, kits can be had from reputable sellers on ebay for good prices .

 

what is currently happening with it? it may still be savable  . are you game for trying a gearbox rebuild? kits will be readily available , they are very common .  

[Hanzonit]

Yeah i bought it in that condition then wrote off the car it was in and im trying to decide whether to rebuild the old box or upgrade etc while finding something that will be suitable. and current condition is as above

[Kiwibirdman]

T5's aren't the greatest box on the planet, World Class versions are rated for 300 ft/lb of torque, non WC are about 260 from memory. It's torque not HP that breaks stuff.

 

Having said all that I have a WC T5 behind the 350 Pontiac in my Firebird, that rated at 380 ft/lb and that box has survived. The protection is the crappy rear tires. 

 

Since you already have gearbox, bell housing, clutch........ I would rebuild the gearbox. 

[Hanzonit]

What if i was after better ratios? i have a t5 off the back of a windsor for better ratios but input and tail shafts are different lengths