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Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 07-12-2005, 02:01 AM   #11
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your SE is a 98, does it have the 4T60-E transmission? or whichver one is extremely light duty, and is rated to handle not much more than the stock engine makes? i know mine is the wussy tranny, you might want to invest in that if you are going to be putting that much power to the ground...or at least attempting to make it go to the ground.
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Old 07-12-2005, 11:47 AM   #12
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98 was the first year for the 4T65-E in the NA'd Bonnies..

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Old 07-12-2005, 12:48 PM   #13
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I know the 4t60-e is light duty but out of curosity how much can it take horsepower wise and torque wise before something breaks
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Old 07-12-2005, 01:14 PM   #14
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Quote:
Originally Posted by sqela
I know the 4t60-e is light duty but out of curosity how much can it take horsepower wise and torque wise before something breaks
I e-mailed pontiac a couple years ago and they told me:
"Thank you for contacting the Pontiac Customer Assistance Center. We
appreciate the opportunity to assist determine the maximum torque on your
engine.

We have documented the information you provided under file 1-88296206.
Please refer to this file in all communication regarding this matter.
We would also appreciate it if you would provide us with your daytime
and evening telephone number.

First, we would like to advise you that Pontiac does not advise
modifying your vehicle and the number we provide below are to only to be used
as a guide and may not always be applicable under certain conditions.

Maximum engine torque-235 LB-FT
Maximum gearbox torque-final drive 3.06=354 LB-FT

We hope that you will find this information helpful and if you should
need to contact us in the future, simply reply to this message or call
our Pontiac Customer Assistance Center at 1-800-762-2737. Customer
Relationship Managers are available Monday through Friday from 8:00 a.m. to
11:00 p.m., Eastern Time.

Again, thank you for contacting Pontiac.

Sincerely,

Tshimanga Mukendi
Customer Relationship Manager
Pontiac Customer Assistance Center"
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Old 07-12-2005, 05:53 PM   #15
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Quote:
Originally Posted by sqela
I know the 4t60-e is light duty but out of curosity how much can it take horsepower wise and torque wise before something breaks
My '93 stock rebuilt 4t60-e blew up my 4th gear drum, welded my carrier, and burned up nearly every clutch plate in there with a 2.2 pulley, intake, and exhaust.

I replaced it with whats in my avatar
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Old 07-12-2005, 05:57 PM   #16
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So can the tranny take 235 ft Lb or 354 ft lb??

So would that cam destroy my transmission?
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Old 07-12-2005, 09:59 PM   #17
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Quote:
Originally Posted by ComfyCar
So can the tranny take 235 ft Lb or 354 ft lb??

So would that cam destroy my transmission?
There are some diffrences.... I'd say the stock 4T60-E would hold up to some abuse as long as you didn't do ant bad burnouts, and took it a bit easy on takeoffs.... I am not easy on my car by any means, but the trans has held up for 140,000 miles, still pulls and shifts good....

The HD trans has a slightly better converter, I think the converter clutch material is better able to handle the supposedly rated 260-280 ft lbs at the crank that the SC'd 3800'* put out... Keep in mind that most SC 3800 have been proven to do more like 300+ ft lbs at the crank... The HD 4T60-E also sat behind the 4.9 Caddy V8 as well... The 3800 SC and the 4.9 V8 was a bit more of a task than the 4T60-E was originally designed for... But it can be built to handle the power...

So I will say the safe number to go with is 235 Ft Lbs... Good Luck

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Old 07-13-2005, 04:16 PM   #18
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Just wondering I still got to get my bonnie running but once she'* running I was thinking of adding a few modifacations here and there and wanted to know how far I could push it before something breaks
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Old 07-13-2005, 05:09 PM   #19
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Well I emailed zzp about the cam

They said my transmission will be fine with a cam,exhaust and my intake.

After the cam I'll probably beef up my transmission. Where should I start?
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Old 07-13-2005, 07:04 PM   #20
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Quote:
Originally Posted by ComfyCar
Well I emailed zzp about the cam

They said my transmission will be fine with a cam,exhaust and my intake.

After the cam I'll probably beef up my transmission. Where should I start?
What are you going to do? Don't throw a n/a cam in there if your going to go boosted later.

As far as the tranny goes, i think the diff is one of the weaker links. Engineered Performance has a clutch type LSD available. I haven't come across a review for that particular tranny though. The guy pontiac jeff there can put together gear ratio conversions for you too, but only if you buy the LSD with it. You have the option of 3.33, 3.43, or 3.73 final drive ratios. I've also head that the gear/chains are interchangeable between the 4T60s and 4t65s. So thier aftermarket solutions could work for you. I'm pretty sure they make Raybestos clutches for the 4t60 too. But if your close enough to zzp, you might want to have them do a rebuild for you. They have a 4T60 in thier 12 sec n/a gt.
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