How much HP/Torque will the Getrag handle? Is it tougher than the Muncie 4 speed?
If you have to ask the questioin then I am going to say you are going to want more HP out of the 3800 than the Getrag will handle. If you want to use a manuel trans then go with the 4 speed.
Then again there are many V-8 owners with 450 HP V-8s that have ran the 5 speeds for years with no problems. Never understood how they get away with it.
Another option for a manuel trans in the 6 speed--Seems like it is the bullet proof way to go these days. There are 650 HP V-8s running them and even one on an LS7.
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05:08 PM
Dennis LaGrua Member
Posts: 16106 From: Hillsborough, NJ U.S.A. Registered: May 2000
How much HP/Torque will the Getrag handle? Is it tougher than the Muncie 4 speed?
The Getrag was designed for 200ft lbs of torque and will take 250 ft lbs but above that you operate in the inknown zone. For an occasional all out 300ft lb burst they have held together but when you really up the power, you are taking a risk. The 4T65eHD and six speed are better choices for performance use. I know quite a few guys who blew the Getrag up when using it with a swap. Its a light duty box and there is no getting arond it.
------------------ " THE BLACK PARALYZER" -87GT 3800SC Series III engine, 3.4" Pulley, N* TB, LS1 MAF, Flotech Exhaust Autolite 104's Custom CAI 4T65eHD w. custom axles, HP Tuners VCM Suite. "THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
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07:53 PM
darkhorizon Member
Posts: 12279 From: Flint Michigan Registered: Jan 2006
So even with a stock L67 you are over the limit of recomended torque I'd guess. I think the L67 in my SS is rated at 240 hp 280 torque out of the box but even with simple mods like the smaller pulley and free exhaust you can really build on those numbers pretty quick. I guess that the 4t65ehd although not as fun as the manual will be the best economical choice when doing the swap. I'm still learning about combinations. What is a fair market price for a used 6 speed and what do they come from?
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08:47 PM
darkhorizon Member
Posts: 12279 From: Flint Michigan Registered: Jan 2006
Going 3x faster than a stock fiero is always fun... no matter what transmission you have behind you. I compare manual and auto swaps sorta like boats vs jet ski's... Like a boat with a big motor is fun in its own way.. its versatile and you dont have to do anything but make sure there is gas in it.
The manual swap is more like a jetski.. its faster, quicker, but is pretty much useless for anything but cruising around, and you have to tinker with it alot.
Its a bad analogy but I think its pretty accurate having been very intimate with both types of swaps.... I have done some pretty awesome things in my automatic fiero, and I havent had to tinker with it at all after I built it... Drag racing (tons and tons of drag racing actually), LONG trips, flat towed towed a mk4 supra 45 miles, pulled a cavy out of a ditch... Some of the only "power displays" I can do are these neat little power slide things when I turn.. it feels cool and is pretty controllable.. and goes away quickly once you get moving. I still find this car tons of fun, and it is more than worth being a bit slower to be dead nuts reliable.
So even with a stock L67 you are over the limit of recomended torque I'd guess. I think the L67 in my SS is rated at 240 hp 280 torque out of the box but even with simple mods like the smaller pulley and free exhaust you can really build on those numbers pretty quick. I guess that the 4t65ehd although not as fun as the manual will be the best economical choice when doing the swap. I'm still learning about combinations. What is a fair market price for a used 6 speed and what do they come from?
Trust me driving a 3800 with a 65E is much more fun then with a 5 speed. All you do with the 5 speed is spend the first 45 second shifting thru 3 gears. If you like to shift them you can manually shift the 65E and hold it to the RPM you want.
do they even make a manuel valve body for the 65E? I guess that could get ya closer to a manuel.
While I guess that it would be possible to go through the gears on an auto, shifting is done on electronic transmissons with shift solenoids, pressure solenoids and the like. It may be detrimental to use this mode of operation continuously but GM does make a TAP shift version of the 4T65eHD that can be shifted manually that some prefer.. For the true stick diehards a stronger trans is the answer and apparently the six speed seems to fit the bill.
------------------ " THE BLACK PARALYZER" -87GT 3800SC Series III engine, 3.4" Pulley, N* TB, LS1 MAF, Flotech Exhaust Autolite 104's Custom CAI 4T65eHD w. custom axles, HP Tuners VCM Suite. "THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
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10:39 AM
GNational1 Junior Member
Posts: 6 From: Roan Mountain, Tennessee USA Registered: Mar 2009
