Is a bulletproof auto tranny needed for 450-500hp build? - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 26 (permalink) Old 03-01-2009, 06:50 PM Thread Starter
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Is a bulletproof auto tranny needed for 450-500hp build?

Just as the title says. What are all you members running for auto tranny mods in this hp range? When I purchased my '01 the guy stated it had a Jasper rebuild put in it about a year ago, I ask him if it was a Monsterbox tranny but he didn't know for sure. I'm wondering if a guy can get away with a good tranny cooler, torque converter, and valve body with the stated hp range? Any thoughts?

John

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post #2 of 26 (permalink) Old 03-01-2009, 06:56 PM
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Re: Is a bulletproof auto tranny needed for 450-500hp build?

i would recommend a john woods transmission. mine has been working flawless.being that there would be no real bullet proof transmission. you would build one or purchase one with the best parts money can buy to help prevent failure.

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post #3 of 26 (permalink) Old 03-01-2009, 06:58 PM
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Re: Is a bulletproof auto tranny needed for 450-500hp build?

it all depends on how you drive it. But i would recommend either a JW or BTS. With 500 hp on tap it would be hard for me to take it easy

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post #4 of 26 (permalink) Old 03-01-2009, 07:29 PM
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Re: Is a bulletproof auto tranny needed for 450-500hp build?

I had just a converter and shift kit in mine for a loooong time at around the 450ish level. Wasn't 'til I added da juice that I had to get a full built trans. Even then it never slipped, got hot, or anything. I just happened to find pieces of clutch in the pan. That was at over 8000lbs on 37's drivin' it like I stole it too.

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post #5 of 26 (permalink) Old 03-01-2009, 08:09 PM
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Re: Is a bulletproof auto tranny needed for 450-500hp build?

From my experience, Jaspers are junk. The factory trans that was in the truck usually lives longer than the Jasper that replaces it, and this is on trucks with just a chip or a lift/tires and a chip.

IMO, I wouldn't throw the cash out for a good tc and vb on a Jasper, they are just too cheaply built. Don't eveng get me started on their rebuilt engines.

If you can't afford a BTS or JW trans, look into Racerx transmissions or get the parts from Racerx and have a good rebuilder build your's for you.

Dave

'08 F250 6.4/Torqshift Spartan 310EL, Flo-Pro 4", White_monster air intake, RCD 4-link, RS9000's 584/1330
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post #6 of 26 (permalink) Old 03-01-2009, 08:51 PM
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Re: Is a bulletproof auto tranny needed for 450-500hp build?

Can't answer for Jasper but a good working stock Ford unit will handle 600rwhp with just a transgo shift kit and a good torque converter.
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post #7 of 26 (permalink) Old 03-01-2009, 09:13 PM Thread Starter
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Re: Is a bulletproof auto tranny needed for 450-500hp build?

Quote:
Originally Posted by Powerstroke Racer View Post
Can't answer for Jasper but a good working stock Ford unit will handle 600rwhp with just a transgo shift kit and a good torque converter.
Glad you posted up, I thought you were running this in one of your trucks.

If I were to purchase a complete transmission, it would either come from BTS or Bowler transmissions.

John

New Truck: '01 F-350, CC, LB, PSD, 4R100, gauges, intake, exhaust, chip SOLD


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post #8 of 26 (permalink) Old 03-01-2009, 09:18 PM
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Re: Is a bulletproof auto tranny needed for 450-500hp build?

Jaspers are junk
just ts chips and trailer towing will blow them out!
Get a good converter, and a transgo tugger kit and add some more clutches and should do fine!

Joe "House" Kupferschmid
1995 F250 7.3 2.6 zf6 Puller
2006 Chevy 3500 CC DRW LBZ, Tow Slut
SOLD:2000 F350 harvester of sorrow

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post #9 of 26 (permalink) Old 03-01-2009, 09:23 PM
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Re: Is a bulletproof auto tranny needed for 450-500hp build?

Does jasper offer steel clutches in their rebuilds?

97 250/95 motor, 400/300's, ts, swamps tuning,gen3, s475, Intercooled, h11 studs,a1000, built tranny. 3.55's, 237,xxx miles fastest non reg. cab obs [email protected] fuel

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post #10 of 26 (permalink) Old 03-01-2009, 09:26 PM Thread Starter
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Re: Is a bulletproof auto tranny needed for 450-500hp build?

I agree with you guys on Jasper's products believe me. I live 30 miles from the place and have heard all kinds of stories about there quality. I'm kind of skeptical to see how long it will hold up with a converter and valve body.

John

New Truck: '01 F-350, CC, LB, PSD, 4R100, gauges, intake, exhaust, chip SOLD


early '99 F-250, PSD 6-Speed SOLD
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