[400 plus]

My combo is below: Well tomorrow I get my 8th transmission since last fall. This one is a new case and starting over and not using my existing trans. I have a TCI that I just had sent to be rebuilt and its a 4k that slips about 7 percent which im told is good. While the tranny is out I was given a 4500 Hughes to use to see if I can get better track#. My tranny guy is telling me a 3500 would be best????? Thoughts??? Thanks in advance

[AG]

We have similar combos except your cam is a little bigger than mine (262/266@0.050" SR). My converter flashes to around 4500-4700 ish rpm and slips 6.8% on the big end. I would think that you would need something that flashes to 4500 rpm not 3500 rpm with your cam. That doesn't mean the Hughes will flash to 4500 unless it was already behind a motor making similar power as yours.

[David Holmberg]

4500+ would work much better than a 3500, unless you street drive it 90% of the time.

[grnmnstr]

8 transmissions????? Somebody or something is not right.

Mounting issues putting undue stress on the case/parts??

Driveshaft not balanced??

Converter/Flexplate/crank hub misalignments??

Converter in too far, not enough??

Driveshaft in too far/ not enough??

Rearend broken??

[400 plus]

Its in the trans. He gives it back no reverse. Next it wont have 2nd or third. Its in his rebuid???? I have broken 2 HD sprags

[400 plus]

Originally Posted by David Holmberg

4500+ would work much better than a 3500, unless you street drive it 90% of the time.

I think that's his thinking

[Probird]

Originally Posted by David Holmberg

4500+ would work much better than a 3500, unless you street drive it 90% of the time.

...X2

[Chupa]

I have a 5200 ATI 8" that works awesome.

I have a 315 ehead 455 with a 269/269 at 050 cam.

[grnmnstr]

I think you should be more concerned with getting a trans rebuilt correctly than worrying about the converter.

[ta man]

Same tranny guy again??

[400 plus]

He started from scratch with a different case. Its DONE again Will test drive it tomorrow. I put the 4500 in it to see the difference.

[Skip Fix]

In the TA with the old roller cam motor when I swapped in a fresh TH 350 for my slipping one we found my 4500 stall was toast(bearing peices floating around) so the only one I had was an A-1 I had restalled for the 400 as it was too tight initially in it. It stalled 5000, flashed to almost 300 just pulling on the trailer loose as heck probably 8-10% top end slippage but it and a good tranny picked the car up 0.75 seconds and picked up the 60 foot by 0.25!

[BARRACUDA1968]

Do you have a dyno sheet either engine or chassis?

If not take a rough guess and try and bring the converter in around peak TQ or a hair above that. This should help the 60 ft and my experience with stall speeds for street use has been about the same meaning whether it was a 3000 stall or 4500 stall the street ability was the same.

If the converter won't couple and you drive through it then that's not good either on the big end.

If the rest of your combo is solid and the chassis is working the converter will make or break you.

I don't race my Pontiac at the track but I do my Grand National and in those cars the converter is critical. I picked up 7 tenths and 9 mph with a converter swap. That's a turbo car though but you get the idea.

[400 plus]

WOW!!!!! What a difference. I like this 4500 stall. Thanks Calvin!!!! Going to Cordova the 22nd

[grandville455]

Did u have a manual valve body put in the trans?

[400 plus]

No I didn't

[T Syron]

You should be real happy with that converter. I had it built for my combo which is very similar to yours. I picked up 2.5 tenths from my B&M 4000. It should stall a little higher than 4500 probably 4700ish Rpm

Tom Syron

[Dragncar]

I would find a new trans guy. 8 trans, what the... 2 broken HD sprags. I do my own 400s and have not had a issue. Just bought the Sessions book and did it myself.
Not trying to bash, but I would not be happy at all to have 340 E heads and run that ET.
I have a car that weighs at least that much (69GTO) with a vary basic pump gas 455 with iron HOs,9.3 CR and a 850 and gone 10.96.
I would have to believe that I could get down to the mid 10 range with those heads.
Something's not quite right.
Maybe your new converter will get you where you want to be. I had PTC build me one and I gained 3 tenths. Can not say enough good things about PTC. They will have a my converter business from here on out.

[grandville455]

4500 stall and no manual valve body , makes for rolled sprags , at this level it just makes sense to run a manual so u can start your burnout in second IMO

[slowbird]

Originally Posted by 400 plus

WOW!!!!! What a difference. I like this 4500 stall. Thanks Calvin!!!! Going to Cordova the 22nd

I might go to Cordova as well, might see you there. The added stall is a good thing imo.