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post #1 of 7 (permalink) Old 12-06-2004, 05:12 PM Thread Starter
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GT Transmission/3.73 rear

I'm toying with the idea of getting a FRPP Pumpkin at some point when I have the money... The problem is I have a '99 GT transmission in my Cougar. I know there are no gears that wor *reliably* with the 8 tooth OP shaft, and I would rather not go the way of a speedcal (want to keep it clean). That said, it would mean I would have to tear down the transmission to replace tho OP shaft.

I just skimmed through Trans 101, and found that the older (95) OP shafts where made of a weaker material than the 98+ ones, so I shouldn't use the OP shaft from my 95 tranmssion. What else should I do while in there (I've done the JMod)? This transmission could end up behind a 450hp DOHC 4.6 (maybe), so I would want to build it to handle that, possibly build extra in...

I'm guessing the following:
-New 7 tooth OP Shaft
-5.4L Panetary Carrier
-Forward Sun Gear
-7 direct clutch plates
-6 forward clutch plates
-Wave plate for SC (5.4?)
-HP intermediate clutch friction (if I drill to the >450 for the intermediate)
-2.7" OD Servo
-5.4L EPC Solenoid

Am I on the right track? Any other words of wisdom?

Thanks.

'95 Cougar - 2002 Explorer engine, 2004 Mustang PTP2 PCM

Best times:
PI 4.6L 95 XR7 Cougar: [email protected]
2004.5 Silverado Crew Cab/Long Bed/4x4 6.6L Duramax: [email protected] (Weighing in at over 7200#) on 10/19/2007
Dyno - 446.4RWHP/820.2RWTq on 6/13/2008
Pulling - 300.9' 3rd place finish 8/2011
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post #2 of 7 (permalink) Old 12-06-2004, 05:14 PM
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i would start with a 5.4 truck core and build it right to the T from jerry's article.

Good luck getting a frpp pumpkin dude, they are discontinued from ford.

Besides 373 isn't enough gear anyway. Get a mark8 housing and DIY.
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post #3 of 7 (permalink) Old 12-06-2004, 05:18 PM Thread Starter
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oops... too bad I didn't have the money when they where fir sale for likg $550 (still don't, but...)

Quote:
Originally posted by JustinH
Besides 373 isn't enough gear anyway. Get a mark8 housing and DIY.
/that might be a cheaper way to go... I don't want to go TOO nuts with the gears... I'll probably need to get a MMX driveshaft with 3.73's anyway, but going ftom 3.08 to 3.73's would probably be a BIG difference off the line...

ETA: What vehicles had the 5.4L/4R70W? It seems like all the trucks have the 4R100.

I'm looking for the less expensive meathod for the same result. I would think (I could be wrong though) that it would cost less to get the replacement parts (rebuild kit +) than get a new (used) transmission, get a rebuild kit, and any additions.

'95 Cougar - 2002 Explorer engine, 2004 Mustang PTP2 PCM

Best times:
PI 4.6L 95 XR7 Cougar: [email protected]
2004.5 Silverado Crew Cab/Long Bed/4x4 6.6L Duramax: [email protected] (Weighing in at over 7200#) on 10/19/2007
Dyno - 446.4RWHP/820.2RWTq on 6/13/2008
Pulling - 300.9' 3rd place finish 8/2011

Last edited by Cougar281; 12-06-2004 at 05:36 PM.
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post #4 of 7 (permalink) Old 12-06-2004, 08:16 PM
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Most F-150's with a 5.4 had the 4r70w. The 250's up have the 4r100.
Alan

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Please do not send me messages on forums they are too hard to keep up with and I don't check in very often anymore call me at 513 898-1580 or email me alan at dirtydogperformance.com
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post #5 of 7 (permalink) Old 12-06-2004, 09:27 PM
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1998 Mark 8 output shaft.

96 Mustang GT 5spd. w/ 248A Option (GTS). Stock for now until I get the Roush on.

97 Thunderbird 4.6L LX /w Sport Package
24k B&M Cooler, 1" lowered, Steeda UD Pulleys, Dynomax cat-back, J-mod, 3.73's, PI intake, PI cams, 03 GT MAF/Tube, SCT tuned - Gone but not forgotten.
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post #6 of 7 (permalink) Old 12-07-2004, 06:55 PM
 
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will the 150 4r70w bolt right up?
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post #7 of 7 (permalink) Old 12-07-2004, 06:58 PM
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Quote:
Originally posted by mylittleblackbird
will the 150 4r70w bolt right up?
The 4.2 and 5.0 4r70w's will bolt to the 3.8's
The 5.4 and 4.6 tranny's will bolt right up to our 4.6's
Alan

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Proud sponsor of the SC/XR7 Shootout and Joel Bender Memorial Nats

Please do not send me messages on forums they are too hard to keep up with and I don't check in very often anymore call me at 513 898-1580 or email me alan at dirtydogperformance.com
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