best automatic tranny - Team Camaro Tech
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post #1 of 11 (permalink) Old Feb 4th, 13, 01:12 PM Thread Starter
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RJ
 
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best automatic tranny

HI,
What would be the best but affordable auto trans for use in my Camaro with about 700-750 hp on spray.
Thanks

69 RS coupe, 4.11 Richmond gears, Muncie 4-speed, Dart SHP 406, 11:1, 4340 H-beam rods and crank. SRP forged pistons, Milodon 7-qt pan, Dart single plane and 215cc Pro1 alum heads, Comp XR300HR cam and roller rockers, Howard hydraulic roller lifters, Hooker 1 3/4" Super Comps, Quick Fuel 750 carb
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post #2 of 11 (permalink) Old Feb 4th, 13, 01:53 PM
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Re: best automatic tranny

400 turbo best bang for the buck if overdrive is not important
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post #3 of 11 (permalink) Old Feb 4th, 13, 02:59 PM
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Re: best automatic tranny

TH400 with reverse manual valve body. The valve body will vastly improve the 2-3 shift and keep you from burning up the trans. Make sure you use good high performance friction materials. Also replace the intermediate sprag with a 34 element unit.

'69 Camaro - 427 SBC Dart Iron Eagle 9.325" block, Crower crank, Crower 6" billet rods, JE pistons (9.5:1), Hellfire rings, AFR 245 heads, T&D steel body shaft rockers, Jesel belt drive, custom ground 4-7 swap solid roller 274/286 @ .050" with .704" lift, Dart single plane, E85 1050 Dominator, Stef's #1705R oil pan, F2 Procharger, Lemons 2" primary 3-1/2" collector, Coan 9" converter
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post #4 of 11 (permalink) Old Feb 4th, 13, 04:06 PM
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Re: best automatic tranny

Quote:
Originally Posted by Steve69SS396 View Post
TH400 with reverse manual valve body. The valve body will vastly improve the 2-3 shift and keep you from burning up the trans. Make sure you use good high performance friction materials. Also replace the intermediate sprag with a 34 element unit.
I highly recomend this, I had TH 400 with some issues once. It was not high H/P engine but did have fair amount of torque in a heavy vehicle. I broke the sprag 2 times. The third time was charm......when it broke it split my case and pretty much trashed everything. I think the only usable part was the trans mount

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post #5 of 11 (permalink) Old Feb 4th, 13, 04:18 PM
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Re: best automatic tranny

The last camaro I had was a big block car. Ibroke two 400 cases. A buddy of mine has been building trans since 1964 tld me he ould build a buillt proof 350. Itold him he was full of it. He built me a short shaft 350out of a second en Camro. He ued red line clutches, heavy duty sprags, revers manual valve body and a clutch spacer from a 700R4 to make room for more clutches. The trans costme about $400. After that Iwas replacing motor mounts, a hood and to twelve blt hosings The trans was strong as bull.
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post #6 of 11 (permalink) Old Feb 4th, 13, 06:14 PM Thread Starter
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Re: best automatic tranny

Thanks much, and what about converter. Keep in mind, I have always been a 4-speed guy, so really know virtually nothing about auto transmission. Mainly want to go auto for the track, very seldom ever do highway driving with it, so overdrive not necessarily a necessity either. Would like trans-brake too, although that is another thing I know nothing about, haha
RJ

69 RS coupe, 4.11 Richmond gears, Muncie 4-speed, Dart SHP 406, 11:1, 4340 H-beam rods and crank. SRP forged pistons, Milodon 7-qt pan, Dart single plane and 215cc Pro1 alum heads, Comp XR300HR cam and roller rockers, Howard hydraulic roller lifters, Hooker 1 3/4" Super Comps, Quick Fuel 750 carb
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post #7 of 11 (permalink) Old Feb 4th, 13, 07:36 PM
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Re: best automatic tranny

For a converter I would call ATI or Coan. A good converter will cost close to $1,000 but it will perform much better. Why do you want a T-Brake? If you do go with a brake you should do it when the trans is built. There are internal mods necessary for the brake.

'69 Camaro - 427 SBC Dart Iron Eagle 9.325" block, Crower crank, Crower 6" billet rods, JE pistons (9.5:1), Hellfire rings, AFR 245 heads, T&D steel body shaft rockers, Jesel belt drive, custom ground 4-7 swap solid roller 274/286 @ .050" with .704" lift, Dart single plane, E85 1050 Dominator, Stef's #1705R oil pan, F2 Procharger, Lemons 2" primary 3-1/2" collector, Coan 9" converter
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post #8 of 11 (permalink) Old Feb 5th, 13, 03:11 AM
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Re: best automatic tranny

Also RJ, if going to an auto trans and a 'loose' convertor, you will have to run an external cooler in front of the radiator. The larger, the better, since you might not have an trans oil cooler in the present radiator, you might. If you do, install ext cooler after the rad cooler and before the trans return line.

When installing cooler and hooking up, fill the cooler from the bottom as this action will 'push' out the air to the top of the cooler for better cooling.

With this said, if using flexible synthetic hose, the hose will have to be changed, maybe every four years, just like coolant hoses & belts, as the rule of thumb.
Those of us who follow this rule, raise your hand.......yep, just as I thought, I didn't see an ocean of hands flying, and neither was mine.

I've been biting my tongue not to say this, but,
'Real men run PG's and don't need no stinkin' brake.'

THM400's take alot of power to turn, magazines suggested 49 hp, lots of mass to turn internally, 34-element sprag is a good upgrade, works very well in my '88 454 Dually weighing 6000lbs,
However, I did have an '88 MCSS, PO installed a '71 307", of all engines, my God, Man, think, and a Rossler THM400 - excellent choice of trans rebuilder. All I had to buy was a new dipstick & tube from Hughes.
THM350's are light duty, take 36 hp to turn. I had one in my '68, 2900 lbs, 28 inch slicks, 4.11, 350CID. Broke the intermediate sprag outer race, the part is right behind the oil pump for easy replacement as I broke this outer race five times, two of them hardened, maybe hardened too much and became brittle, I always had an extra one on the shelf for those overnight repairs to race the next day,
Powerglide takes 18 hp, I returned it back into the car with a looser convertor and never looked back, ran a faster mph.

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post #9 of 11 (permalink) Old Feb 5th, 13, 01:32 PM
Bud
 
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Re: best automatic tranny

If you don't care for o/d a 400 will be fine, will have to be built good. as far as convertors, continental is the very best. if you want o/d a 4L80E is a 400 w o/d but will require a computer to run it
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post #10 of 11 (permalink) Old Feb 5th, 13, 01:38 PM
Bud
 
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Re: best automatic tranny

Forgot the powerglide! excellent trans ran a stock case p.g in a late camaro 8 years never touched it, i did run a 2:08 1st gear though w a 393 sb 9 teens all day long. You should figure what 1st gear you want and also if you want auto shift or man.
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post #11 of 11 (permalink) Old Feb 12th, 13, 04:05 PM
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Re: best automatic tranny

Hey RJ, I'm in the same boat and am switching to a 3 speed auto behind a new 406. Jakes peformance trans builds a th350 that they claim to reliably hold up to 600 horse. If your going to spray it alot that may not be enough but that is the route I am considering. Keep us posted of which direction you go.

68 originally ss (straight six) 406,Afr210,Bullet solid roller,rpm airgap,QF750,th400,3.73 Eaton posi.11.02 @ 122.74
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