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Old 07-16-2014, 04:18 PM   #1
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Transmission max hp

Im wondering what my stock 99 automatic v6 transmission's max hp is and if i would be able to put either a 3.7 or 4.6 engine in it.
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Old 07-16-2014, 04:29 PM   #2
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It can handle a 4.6.
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Old 07-16-2014, 08:42 PM   #3
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Im wondering what my stock 99 automatic v6 transmission's max hp is and if i would be able to put either a 3.7 or 4.6 engine in it.

Same exact trans as a GT, it can obviously handle the 4.6. The 3.7 isnt much more powerful than the 4.6 so that should be alright too
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Old 07-19-2014, 02:07 PM   #4
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Same exact trans as a GT, it can obviously handle the 4.6. The 3.7 isnt much more powerful than the 4.6 so that should be alright too

Im talking about the 4.6 in a 05-10 gt


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Old 07-19-2014, 06:25 PM   #5
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Im talking about the 4.6 in a 05-10 gt


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The trans usually handles 50-60 more than stock so yeah you would be ok. The 4.6 (99-04) with the 4r70w supports 260hp at the crank. The 4.6 (05-10) has 300hp-320hp so ull be at the maximum limit of the 4r70w.
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Old 07-19-2014, 10:38 PM   #6
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The trans usually handles 50-60 more than stock so yeah you would be ok. The 4.6 (99-04) with the 4r70w supports 260hp at the crank. The 4.6 (05-10) has 300hp-320hp so ull be at the maximum limit of the 4r70w.
Umm where did you learn this? Then how are supercharged guys with stock transmissions other than a convertor able to put down the 400whp range no problem?
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Old 07-19-2014, 10:47 PM   #7
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The trans usually handles 50-60 more than stock so yeah you would be ok. The 4.6 (99-04) with the 4r70w supports 260hp at the crank. The 4.6 (05-10) has 300hp-320hp so ull be at the maximum limit of the 4r70w.
Lol, the Marauder guys routinely run the 4R70w to 500 ft lbs in a 4k+lb car. So no. The stock auto in the 04 GT/Mach (4R75w) is good for even more.

As for the original poster. Your 99 V6 trans is a completely different bolt pattern than a modular engine so no it won't work just because it won't physically fit.
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Old 07-19-2014, 10:47 PM   #8
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Umm where did you learn this? Then how are supercharged guys with stock transmissions other than a convertor able to put down the 400whp range no problem?

I've always learned that to play it safe with the 4r70w, dont go about 50-60 rwhp over stock. Maybe those guys are use the 5 speed T45?
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Old 07-19-2014, 10:51 PM   #9
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Lol, the Marauder guys routinely run the 4R70w to 500 ft lbs in a 4k+lb car. So no. The stock auto in the 04 GT/Mach (4R75w) is good for even more.

As for the original poster. Your 99 V6 trans is a completely different bolt pattern than a modular engine so no it won't work just because it won't physically fit.






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I've always learned that to play it safe with the 4r70w, dont go about 50-60 rwhp over stock. Maybe those guys are use the 5 speed T45?
I'll just quote Scotty for you
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Old 07-19-2014, 10:52 PM   #10
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I've always learned that to play it safe with the 4r70w, dont go about 50-60 rwhp over stock. Maybe those guys are use the 5 speed T45?
Marauders are automatics dude. Whoever told you to stick 50-60hp over stock with the 4R either was clueless or was stuck in the 80s/early 90s where domestic automatics grenaded if you sneezed on them. The 4R is good for around 500ft lbs at the tires and the 04s I mentioned are stronger than that.
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Old 07-19-2014, 10:54 PM   #11
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Marauders are automatics dude. Whoever told you to stick 50-60hp over stock with the 4R either was clueless or was stuck in the 80s/early 90s where domestic automatics grenaded if you sneezed on them. The 4R is good for around 500ft lbs at the tires and the 04s I mentioned are stronger than that.

Really? Wow lol. That makes me feel better about my car then lol
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Old 07-19-2014, 10:57 PM   #12
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Just make sure you do fresh fluid in the trans and converter every 30k or so and J-mod the trans if you haven't already. That not only is a practically free "shift kit" but it improves transmission longevity as well.
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Old 07-19-2014, 10:58 PM   #13
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Just make sure you do fresh fluid in the trans and converter every 30k or so and J-mod the trans if you haven't already. That not only is a practically free "shift kit" but it improves transmission longevity as well.

How is it practically free? Dont you have to buy j mod kits in order to do so? Or is there a way around that
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Old 07-19-2014, 11:02 PM   #14
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Google the J-mod, you need two drill bits and new separator plate gaskets Totals to about $60. You drill out specific holes in the separator plate to a bigger diameter and remove a few accumulator springs. The mod was designed by one of the primary Ford 4R developers (Jerry Wroblewski which is why it is called "J-mod") and is one of the best things you can do to your car if you have an auto.
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Old 07-20-2014, 02:25 PM   #15
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Ok so can i get a clear answer how much can my transmission handle?


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Old 07-20-2014, 03:15 PM   #16
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It'll handle plenty of power. I'd be more worried about a stock bottom end 4.6 giving out before the transmission
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Old 07-20-2014, 03:52 PM   #17
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Ok so can i get a clear answer how much can my transmission handle?


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It's a 4r70w and I already gave that answer. I also mentioned how the v6 trans can't physically bolt to a 4.6l.

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Old 07-20-2014, 04:27 PM   #18
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It's a 4r70w and I already gave that answer. I also mentioned how the v6 trans can't physically bolt to a 4.6l.

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If i do decide to replace my engine im getting a new transmission. Just wondering if i could temporarily keep it


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Old 07-20-2014, 08:53 PM   #19
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As long as you have the V6 it will be more than fine. If you are asking if it will be ok for awhile behind a 4.6L temporarily... again it won't bolt up.
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Old 07-20-2014, 08:59 PM   #20
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As long as you have the V6 it will be more than fine. If you are asking if it will be ok for awhile behind a 4.6L temporarily... again it won't bolt up.

Na i was wondering if it was possible


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