8" ATI converters on the street....? - Page 2 - Chevelle Tech
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post #16 of 50 (permalink) Old Jul 9th, 19, 10:43 PM
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MARK
 
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Re: 8" ATI converters on the street....?

Quote:
Originally Posted by ShouldntBeHere View Post



Yes I'm talking about the seal on the shift shaft from the valve body to the shifter linkage/cable. Probably some kind of lip seal or o ring. Maybe if I removed the linkage I could slide the seal out over the shift shaft from the outside but...I doubt it, at least not without dropping the trans down. There is no room in there.


Pretty much made my mind up to pull the trans, refreshen it, and get a 8" converter from Mark.


The trans still works great but, its 10 years old and has 26k miles on it...LOTS of passes on the street/strip.


Mark, I'll call you tomorrow if you see this.


Maybe this ole jalopy will run some 10.20s with a real converter...
I've waited many years for this............................................

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post #17 of 50 (permalink) Old Jul 10th, 19, 1:58 PM Thread Starter
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Alan
 
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Re: 8" ATI converters on the street....?

Well ordered the 8Ē ATI from Mark today.

Gonna start pulling the trans tomorrow and have the whole thing refreshened and add a little line pressure etc.

Hopefully it wonít be down longer then a few weeks or so. Get it up and running for the end of the summer...and more importantly dialed in for the Winter air.

Mark thinks it will pick up a good bit with his converter...

Iíd love to gain .1-.15 in the 60í and .3 in the 1/4...

1971 Corvette
VortecPro 496"
T400, Tight 10" converter
3.36 gears, 3700lb raceweight
[email protected], 1.51 60'
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post #18 of 50 (permalink) Old Jul 11th, 19, 6:24 PM Thread Starter
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Alan
 
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Re: 8" ATI converters on the street....?





Definitely shift shaft seal is the leak culprit.... 4 pan gaskets and 2 pans later...

And the tear down begins.... Got everything on the bottom off...just need to do the top stuff tomorrow..should have the trans out pretty quick, then off to the trans builder on TuesdayÖ


1971 Corvette
VortecPro 496"
T400, Tight 10" converter
3.36 gears, 3700lb raceweight
[email protected], 1.51 60'
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post #19 of 50 (permalink) Old Jul 11th, 19, 8:40 PM
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Ron
 
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Re: 8" ATI converters on the street....?

Sweet!! Looking forward to the results

69 Camaro
491/AFR 315/Straub hyd roller/pump 91
TH400/GV OD/9" 3.50's/ 255/60/15 DR

10.86 at 124.8
3670 with driver
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post #20 of 50 (permalink) Old Jul 12th, 19, 8:06 AM
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Re: 8" ATI converters on the street....?

That's a good looking C3!

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post #21 of 50 (permalink) Old Jul 12th, 19, 10:36 AM
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Lew
 
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Re: 8" ATI converters on the street....?

Do you have straight axle in the Corvette there? I am sure you are aware those are not the best for 60 foots as far as strength even with half shaft upgrades - is the 8 inch going to compound this problem at track. Great weight transfer though. What does car weigh like 3,500 pounds with a full tank? I really like that hood where is that from? A friend of mine has a 1970 Corvette he put a 9 inch independent rear in and could use a hood like that.
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post #22 of 50 (permalink) Old Jul 12th, 19, 1:03 PM Thread Starter
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Alan
 
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Re: 8" ATI converters on the street....?

Quote:
Originally Posted by Lew540 View Post
Do you have straight axle in the Corvette there? I am sure you are aware those are not the best for 60 foots as far as strength even with half shaft upgrades - is the 8 inch going to compound this problem at track. Great weight transfer though. What does car weigh like 3,500 pounds with a full tank? I really like that hood where is that from? A friend of mine has a 1970 Corvette he put a 9 inch independent rear in and could use a hood like that.
The car is still IRS. Has all of Tomís Differentials hardened stuff in it...12 bolt spiders/cross pin, shimmed clutch pack (no springs). Pretty much the only 10 bolt parts left is the ring/carrier... and the carrier has been stressed relieved/polished..

Hopefully it holds...but it has been in there for 10 years with probably 120 passes in the 1.5x 60í range.

But yeah I agree, the 8Ē ATI will be the true test for the rear end. Iíd love to see a 1.399999 60í.

The car weighs right at 3700lbs with me in it, on skinnies. About 3750lbs on stock wheels/tires. Car has iron heads, AC, 4 boxes of Dynamat, stereo system etc.. itís a heavy pig.
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1971 Corvette
VortecPro 496"
T400, Tight 10" converter
3.36 gears, 3700lb raceweight
[email protected], 1.51 60'
STOCK APPEARING
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post #23 of 50 (permalink) Old Jul 12th, 19, 3:16 PM Thread Starter
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Alan
 
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Re: 8" ATI converters on the street....?

There we go...

Now the waiting game begins.
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1971 Corvette
VortecPro 496"
T400, Tight 10" converter
3.36 gears, 3700lb raceweight
[email protected], 1.51 60'
STOCK APPEARING
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post #24 of 50 (permalink) Old Jul 12th, 19, 4:23 PM
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Re: 8" ATI converters on the street....?

Here is photo of the 9 inch on the 1970 Corvette. The half shaft I think are 1480 series. Stick car 540 Donovan.
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post #25 of 50 (permalink) Old Jul 12th, 19, 4:46 PM Thread Starter
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Alan
 
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Re: 8" ATI converters on the street....?

Quote:
Originally Posted by Lew540 View Post
Here is photo of the 9 inch on the 1970 Corvette. The half shaft I think are 1480 series. Stick car 540 Donovan.
Damn thatís a crazy setup. Iíve never seen one of those. Obviously a custom built deal.

Now RideTech is making a 9Ē IRS conversion but itís like $12k.


If my 10 bolt breaks, Iíll probably go ahead and have the full 12 bolt guts installed.. itís about $7k just for the diff. The only reason I didnít do it originally is that the tallest gear you can run is a 3.73 and I didnít want that much gear. So I kept the 10 bolt ring/carrier so I could stay 3.36. I drive on the highway a lot.


Iím sure youíve seen it, but 427Hotrod has a killer Dana 60 IRS out of an old Super Comp car or something. Itís bad ass.
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1971 Corvette
VortecPro 496"
T400, Tight 10" converter
3.36 gears, 3700lb raceweight
[email protected], 1.51 60'
STOCK APPEARING
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post #26 of 50 (permalink) Old Jul 12th, 19, 4:55 PM
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Re: 8" ATI converters on the street....?

Yes this guy built in a garage were at a rental house we shared back in 1995/1996. I remember watching him built and getting parts before the internet. As you can see a lot of work and engineering in there. I had a 540 Chevelle and he had a 540 Corvette.
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post #27 of 50 (permalink) Old Jul 13th, 19, 9:58 AM
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Chris
 
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Do you and your Vette a favor and disconnect the kick down if you haven’t already.
It will no longer be needed with the new tree master converter.
My lil 406 would boil regular radials at 45+ mph in 3rd with no kick down cable.
Your going to be very happy with it. I beat the crap out of mine for 7yrs and had zero issues.
It was spec’d for my lil sbc and 4.30’s and a 28” tire.
My son now has it and my 15yr old stock rebld th350 in his bu behind his 600hp sb and drives it all the time too! He only has 3.42’s in his car and nets 1.50 60’s leaving off idle.
I spoke to Charlie P down there. Good guy.
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73 nova,3515#(all steel)Pump gas!(91octane)406ci N/A, best 1/4,1.45 '60,[email protected],10.6 @ 122.38, short shifting,NO tuning!


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post #28 of 50 (permalink) Old Jul 13th, 19, 8:45 PM
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Joe
 
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Re: 8" ATI converters on the street....?

I'm sure by now you've already replaced the stock sprag assembly. Final weak link in my trans was the input shaft and forward drum. If you haven't upgraded it yet, consider the 300M input shaft and drum.

https://tsirace.com/shop?olsPage=pro...d-forward-drum. After that, it's really just about keeping temps down.
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post #29 of 50 (permalink) Old Aug 19th, 19, 11:49 AM Thread Starter
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Alan
 
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Re: 8" ATI converters on the street....?

Finally got the trans and 8" ATI converter in. The trans was still working great but turned out to have a good bit of damage in it. Clutches were about done, sprag was cracked and the splines were about half worn off the pump stator shaft... I guess 168k miles on a pump will do that.

So its all back together and seems to be working ok, just waiting for some cool weather now to hit the track. I'm VERY curious to see what it picks up. The converter feels VERY loose at WOT... I guess we'll see.

As for the driveability, it IS driveable, but certainly not pleasant. I won't likely keep this converter in it after some track testing. No way I could take it on a long trip with this converter in it. Time will tell...
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1971 Corvette
VortecPro 496"
T400, Tight 10" converter
3.36 gears, 3700lb raceweight
[email protected], 1.51 60'
STOCK APPEARING
ShouldntBeHere is offline  
post #30 of 50 (permalink) Old Aug 19th, 19, 12:09 PM Thread Starter
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Alan
 
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Re: 8" ATI converters on the street....?










Tiny little sucker. Weighed 20.5 lbs.
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1971 Corvette
VortecPro 496"
T400, Tight 10" converter
3.36 gears, 3700lb raceweight
[email protected], 1.51 60'
STOCK APPEARING
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