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Old 02-08-2020, 12:30 PM   #1
Scooby Newbie
Member#: 511474
Join Date: Feb 2020
Default Durability of 07 WRX Trans with 300WHP

I was about to order a VF39 turbo for my 07 wrx and get protuned for around 300WHP. Will the transmission basically grenade if I do any sort of hard launch/pull (I am aware that all trans and cars are different, just looking for a general rule or idea)? A full STi trans swap is out of my budget rn so if I canít get away without upgrading the trans what are my options?
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Old 02-08-2020, 04:42 PM   #2
Dave D.
NASIOC Supporter
Member#: 130990
Join Date: Nov 2006
Chapter/Region: NWIC
Location: Menzel Lake, WA
06 Red Ltd.Wagon
Dom 1.5xtr JJ tuned


I ran a VF39 on my '06 for several years with no issues. I didn't blow 3rd until I stepped up to a bigger turbo. These trannies will often strip 3rd, in my case I was passing a car on a 2-lane at about 45mph when it went "whiiiiizzz" and 3rd was no more.

You might look into a partial swap -- mine has a non-dccd JDM 6-speed, with an automatic driveshaft (for fitment) going into the rear R-160 that has been swapped to 3.9 gears (which is the ratio used in the GD auto tranny WRX). A very common swap, and you can search many such setups here. No electronics or hub swaps to worry about. Oh, and you do need an STI clutch. Good luck!
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Old 02-08-2020, 09:05 PM   #3
Scooby Specialist
Member#: 29292
Join Date: Nov 2002
Chapter/Region: SCIC
Location: Orange County CA
2004 WRX wagon


if you let the synchros do their job and come up to speed it should last a long time, at least mine did. Speed shifting is kinda a bad thing too
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Old 02-10-2020, 11:33 PM   #4
👏 Big Ron 👏
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Join Date: Apr 2002
Chapter/Region: MAIC
Location: I can save you a ton of cash
on car parts so PM
me b4 j00 buy


You are posting in the wrong forum. There are 50 options, go read all the sticky threads and find which fits you best. If you have skill, you need no options.

Moving to the right forum.
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Old 02-11-2020, 08:47 PM   #5
Scooby Newbie
Member#: 491030
Join Date: Sep 2018

I have an 07 WRX with VF39, DW300 fuel pump, STi intercooler, Southbend Stage 2 Daily clutch. Made 276whp and 309wtq. No problems so far (5 months on this setup). I did a few pulls rolling into WOT in 3rd and 4th. I've messed up shifts a few times (bad timing on a shift). I don't launch, but I've gone a little hard from a stop light to beat traffic a couple times. No real problems. I don't drive hard though.
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Old 02-12-2020, 11:00 PM   #6
Scooby Specialist
Member#: 107618
Join Date: Feb 2006
Chapter/Region: Tri-State
Location: NY
2006 OBP WRX Wagon


It's not a matter of if but when. Plan for a 6-speed swap now. You don't need a full swap. Plenty of 07 STI trans available here and on the FB groups. 07 STI trans, automatic driveshaft and 02-05 R160. There's other things like the shifter, clutch system, etc but that at least eliminates the 5x114 wheels, brakes, hubs, axles etc that really rings you up.

I blew my 5 speed and did the above. Nobody doesn't go hard on a car that you tuned to have more hp.
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Old 02-15-2020, 02:49 AM   #7
Scooby Newbie
Member#: 511520
Join Date: Feb 2020
Location: Currently in CA

What about the 4EAT? Is that weaker than the 5sp with tuned higher hp?
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