how much power can a muncie take before it grenades?

here's a quick way to find out: put it in first and hold the clutch in. Then put your right foot on the gas pedal..press and hold to the floor.

when the revs get up nice and high and I mean nice and high, now.....pop the clutch.

if it stays together, then it probably just handled all you can give it. you should re-test just to be sure its ok. if it grenades, well then you just found out that it won't handle any more than you just gave it!

how's that sound?

i don't have one at the moment, so i want to see if a muncie is worth buying

The original Muncie transmission in our COPO Chevelle still worked fine after close to 200K miles. The shifter didn't last six months. Street tires don't have enough traction to hurt the trans I guess. Slicks and good horsepower will soon find the weak spots if there are any. The old original Muncie shifter, and/or people who can't shift probably caused the demise of many more. If you want strength, go with a TKO 600.

I would guess around 475 and 500 horeses.

OK.

From what I can find out from anywhere I read, the Boards and all the mag's..

M-20, about 400 to 425 or so;

M-21, about 425 to 450 or so; and the

M-22 like about 450 to 475, MAYBE 500???? or so, give or take.....

And guy's are saying that the new Supercase with the steel mid plate and the M-21 Italian gear set is like 600+..

So go from there..

Sorry that I have to spell it out this way b/c NONE of the OEM's max. rate their STOCK stick trannies.

pdq67

^^^
thanks, thats what i needed to know

I grenaded a Muncie three years ago on the street w/BFG drag radials.
Spun the tires for about 2 feet and when the BFGs hooked, BAM tinkle, tinkle...:eek:

Rebuilt it and it leaked out the countershaft pilot hole.
A sign the case stretched.

Bought an Auburn Gear Supercase w/M22 gears, rollerized first gear and
a cast mid plate, fine spline.
I launched this trans from 5 grand w/slicks. Didn't spin a tire.
All was good.
Rear posi didn't like it, but I think that was from a one wheel burnout
warming the slicks.
Can't get good help at the track these days.
Lesson learned. Make sure the water box has water on BOTH sides
and, when you start your burnout, DROP the clutch to make sure both
sides are spinning. Otherwise, goodby posi.

I grenaded a Muncie three years ago on the street w/BFG drag radials.
Spun the tires for about 2 feet and when the BFGs hooked, BAM tinkle, tinkle...:eek:

Rebuilt it and it leaked out the countershaft pilot hole.
A sign the case stretched.

Bought an Auburn Gear Supercase w/M22 gears, rollerized first gear and
a cast mid plate, fine spline.
I launched this trans from 5 grand w/slicks. Didn't spin a tire.
All was good.
Rear posi didn't like it, but I think that was from a one wheel burnout
warming the slicks.
Can't get good help at the track these days.
Lesson learned. Make sure the water box has water on BOTH sides
and, when you start your burnout, DROP the clutch to make sure both
sides are spinning. Otherwise, goodby posi.

That would be Auto Gear.

just for comparison how much can a super t-10 take?

I put over a 150 runs on my 3740lb 68 Chevelle SS396 with the original M20. I then switched to the 489 with the same tranny running in to the 11's. I put a Autogear in for about 40 run's before I decided the car really needs to get back a street\cruise in car. I never had a tranmission problem. A lot has to do with the driver. 4000-4500 launches with slicks......

just for comparison how much can a super t-10 take?

I had my Super T-10 built by S-K Speed Inc located in Lindenhurst NY. Brian (at S-K) is the guy you want to talk to about beefing up a Super T-10. He specializes in building nothing but manual tranny's for street/strip and racing cars. He really knows his stuff. Been building manual transmissions for over 40 years.

http://www.skspeed.com/aboutsk/transshop/default.asp

He built me a Super T-10 with 2.64 / 1.75 / 1.34 /1.00 gearset, 9310 high nickel content cluster gears with specially modified syncros, nodular iron main case with a nodular iron mid-bearing plate. Brian told me that this tranny is the "strongest" OEM type transmission for a street/strip GM car. "In his opinion", a Super T-10 built like this is stronger than the new M-22 with the AG Supercase. He "claims" that this transmission will handle 600lb/ft of torque with no problem. I know that this depends on a lot of different variables but he has guys using them at the strip, with big blocks, N2O and slicks (off the line). To get anything stronger he says you have to go to a racing transmission like a Jerico or G-Force.

I myself am running a solid roller cammed 550HP 454 (an estimate) and have used a 150 shot of N2O with Hoosier QTP's (on the street) and have had no issue with my tranny.