transmission strength

[donniekak]

I have searched and couldn't find a definite answer, so here goes. I come from a 3000gtvr4 background. The 5-speed getrags just don't break. The only weak link is the transfer case and output shaft, but the actual transaxle can take 800+lb/ft no problem. Internally the gears are huge.
I'm in the process of building a gvr4 right now. It's come time to build the transmission, this is where i'm lost. My engine build is a rebuilt stock long block with arp headstuds. I'll be running a hx-40 with full supporting mods and shooting for about 400 whp. Will this kill a freshly rebuilt stock transmission? At what point will i need to upgrade? I can do all of the work myself, i've been rebuilding awd manual transmissions for a while. I just can't find any definite torque ratings for this transmissions parts. The pic is of the getrag 3rd and dsm 3rd comparison.

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[kspharris]

You shouldn't break the tranny but would probably kill the rear end first....try to find a 4 bolt rear from a 92+ model to go into it. All should hold up fine to 400whp. Good luck.

 

[DSMtsi23]

Hey you shoud check out John shepard. Worlds Quickest 4 Cylinder AWD and Fastest AWD drag car in the world. He builds awesome trannys. Im sure he could answer any of your questions to. Here is his site check it out.
Sheptrans.com
::Shepracing.com - Home::

Hope this helps.

 

[donniekak]

Thanks for the input but i know all about shep, jack's, tre, ipt. I'm looking for people to tell me what broke and at what power level in their transmission. I have a 4-bolt lsd going in and will be using an upgraded 4-spider centrer diff. I'm looking for the torque numbers where 3rd and 4th start to shear the teeth off from a roll. The only upgrade that any of the shops do with helical gears is to use the evo gearset. I'm wondering when i'll need to upgrade.

 

[DSMtaco]

Either build a tranny to prevent grenading, or wait for the aftermath and rebuild. Our center diffs are definitely a weak leak, but a 4 spider or welded diff can change that...as you've already mentioned. I'll look into the torque numbers you requested.