500 or more RWHP cars and transmissions

R.A.T.M. · Aug 18, 2007

I am looking for feedback from people that have had well built auto's and/or good manual transmission set ups. I currently have a 4r70w built by Jerry to handle 900 or so horsepower and a PI 3400 stall - 3 clutch converter. I haven't had any problems, but I am wondering if I am missing out by not having a TKO-600 or Viper spec T-56. I am kind of on the fence on this because there are pros and cons either way.

blksn955.o · Aug 18, 2007

As much as I like manuals...if you have a good auto now and 500rwhp. Keep the auto.

BlueOvalStangGT · Aug 18, 2007

I believe the TKO 600 is only rated for 600hp, but I know plenty of people with much more then that. Also, the T-56 is gonna be quite a bit stronger as well, hell my friends stock Cobra T-56 is holding up fine with 12XXhp and some of those viper cars are going 8s with the T56.

Pokageek · Aug 18, 2007

Promotion (only) G-force trans. NOT regular g-force.

GTA_V6_Mustang · Aug 18, 2007

Pokageek said:
Promotion (only) G-force trans. NOT regular g-force.

what do you mean?

Pokageek · Aug 18, 2007

Sure, I mean a company called promotion power train makes the gforce trans . The guys I know who run the poop out of cars had a 650rwhp car spinning over 7k rpm that blew up 2 gforce transmissions. The ones that promotion put together never blew up and took anything they threw at it. Promotion puts em together differently.

I personally like the g force because no vibration bs, direct fit replacement , just put it in and go with out a lot of bs.

GTA_V6_Mustang · Aug 18, 2007

you know anyone who has run a t-5 with a g-force kit they installed themselves? And if you do how did it hold up? Thats what I have been thinking of doing. because i really like my t-5

go-stang5.0 · Aug 19, 2007

I have a g-force t-5...running for 3-4 yrs. in my DD/Road Race car no problems whatsoever. I just have the basic kit 26spline input shaft and 1st, 2nd, and 3rd gears. Stock case, stock output shaft and stock 5th gear. I had mine rebuilt locally back then for like $250 bux and I did the removal/install myself. But then again my car only makes like 350rwhp and I have never had slicks on it and/or tried to launch the car at like 5000rpm like some of you guys do. Thats the info I have for what its worth. I dunno of anyone locally with a g-force kit other than me so I have no info on their fancier case, output shaft, etc.

thomas91169 · Aug 19, 2007

R.A.T.M. said:
but I am wondering if I am missing out by not having a TKO-600 or Viper spec T-56. I am kind of on the fence on this because there are pros and cons either way.

for a all out track car, id stick with auto. consistency ftw.

for fun anywhere else, manuals are it.

go-stang5.0 · Aug 19, 2007

I'd donkey punch my sister....

...whats wrong with you man!

94opalgt · Aug 19, 2007

my tuner just blew up his g-force t-5 friday night. 96 cobra w/ a 5.0 on N.O.S. he said it sounded like a bomb went off. but the car did a 1.39 60 foot on slicks when it went. blew up on the 1-2 shift. car didn't even make 500rwhp i dont think. broke the case and everything.

Pokageek · Aug 19, 2007

I got the hardened case on mine.

earleys94gt · Aug 19, 2007

If you were putting thousands into your engine, why would you not get the best trans. you could? There's no point in making 500 whp, if you can't "transmit it" safely and efficently to the wheels.

Pokageek · Aug 19, 2007

earleys94gt said:
If you were putting thousands into your engine, why would you not get the best trans. you could? There's no point in making 500 whp, if you can't "transmit it" safely and efficently to the wheels.

Budget. For example, he could keep what he has and get the gforce or tko when he can afford it.

earleys94gt · Aug 19, 2007

True, but I guess I am just ranting/venting on this. No harm, no foul. I hear friends complain about making good power and breaking transmissions. When all they need is a better tranny, not a rebuilt stocker.

Venom351R · Aug 20, 2007

Its always in the budget, just have to save for longer.

callys · Aug 20, 2007

Grenaded a tko-600 in my challenger on slicks after only 1,500 street miles. I don't have any experience with high horsepower fords but its all the same basically. Never had any trouble with even mildly modified torqueflite automatics.

What really makes the difference in drivetrain longetivity if how much torque and where you are making it. Whether or not you are really letting the trans have it.

I think its more than possible that a transmission that grenades behind a motor making 600lbs of torque at 2k rpm may live forever behind a motor with a very peaky 800lbs of torque at 5k rpm if that makes sense.

Wi Stang · Aug 21, 2007

I have a T-56 Viper spec in the car right now with a Zoom stage 3 clutch setup. The tranny has been in there for about 2 years without any issues.
Last year I was running around at 487 rwhp, and this year it put down 511 rwhp. I am very happy with the choice to go with the T-56. It shifts really smooth. I can't really compare it with a T-5 since my car was an auto before the swap.
If I was looking to have a serious race car, I would have stayed with an automatic, but I am just looking for something that is fun to drive around town, and at the track.
The best I was able to get with it on Nitto DR's was an 11.68 @ 125.

R.A.T.M. · Aug 28, 2007

Looks like I am going to the TKO 600 set up. The only thing I am having a hard time deciding on is the cable/adjuster/quadrant. Any input?

BlackVert · Aug 28, 2007

if you decide to sell your 4R70W, let me know, i might be interested in upgrading mine.

500 or more RWHP cars and transmissions

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