Thread: 4T65E Top Speed

What is the top speed the trans is capable of? Lets say I took my car over 140 where will it stop? physical limitation or grenading

A better question is what are your tires rated to?

Well, the engine can go up to 142mph. Who rly needs to that fast though?

Originally Posted by SDGTP99

Well, the engine can go up to 142mph. Who rly needs to that fast though?

It'll go faster than that.

Originally Posted by acidcrashdburnd

What is the top speed the trans is capable of? Lets say I took my car over 140 where will it stop? physical limitation or grenading

Gearing limitation is around 180-190 based on the drive ratios.

Originally Posted by Jakescoots

A better question is what are your tires rated to?

looks like 149 from Uniroyal's site.

But I don't like going above 110. The question is what is the most possible speed these stock transmission can achieve before hitting a physical limitation or grenading Not what will happen when I go that fast.

225/50ZR16

in excess of 149 mph, 240 km

Not trying to be a dick just trying to make the point that ​I HAVE NO INTENTIONS OF GOING THAT FAST.

I think I have seen some of them go so fast the HUD flashes 199 on a dyno...

Stock, 4th gear clutch shaft will strip.

Built? the sky's the limit providing you have the hardened shaft.

Yea it might have had the hardened shaft... IDK for sure...

Car won't shift into overdrive (4th) in Wide Open Throttle, you have to let off to make it shift. But depending on gear ratio, the Bonneville that ran at the Salt Flats ran 207mph I believe.

I've had a 2.93 geared car up over 140mph a couple times, and at 130mph for an extended period of time.
Still on the stock tranny, When it came time to do a street build, 4th gear shaft was on it's last legs.

Originally Posted by BoostenGTP

Car won't shift into overdrive (4th) in Wide Open Throttle, you have to let off to make it shift. But depending on gear ratio, the Bonneville that ran at the Salt Flats ran 207mph I believe.

That couldn't have a stock trans... btw THATS FAST and kinda awesome.

Originally Posted by Nixon

I've had a 2.93 geared car up over 140mph a couple times, and at 130mph for an extended period of time.
Still on the stock tranny, When it came time to do a street build, 4th gear shaft was on it's last legs.

Is that what is in my car "2.93"? 3.29 came in the GTP correct?

All the l67/32 cars came with 2.93 except for compG.

Originally Posted by Nixon

All the l67/32 cars came with 2.93 except for compG.

Good to know, Thanks.

Your car probably has 3.05 gearing if its the stock gt tranny and theoretically it will go to 210 and that would be at ~6,000 rpm in 4th

It'll blow up.

Don't go faster than you can trap in the 1/4th mile.

Originally Posted by Fivefingerdeathpunch

It'll blow up.

Don't go faster than you can trap in the 1/4th mile.

THAT is good advice.


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lol. nah.

With 3.29's (built obviously and a built engine) I was doing 145mph without realizing it one day. The motorcycle dude face told me it was time to look at the HUD. Had plenty of pedal left.

The transmission itself and it's point of failure really depends on the trans and the fluid. If the fluid temp spkes, you are going into limp mode. If the trans has a flaw...you are going to break. Those are likely the first limiting factors. PCM programming obviously has to be modified to go over the stock limiters etc.