Motor support question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

adam122 · 03-09-2003, 10:43 PM

I posted on the other board about how I have broke the housing on two turbo 400 transmissions. I have been calling around tryin to figure out how it happened, and I was told that its possable that when reving the engine a lot that the back of the motor is picking up too much and ripping off the housing on the transmission. I was told in some 4x4 trucks there is some kind of support or mount that hooks to the back of the motor. Anyone know what this is, where i can get it and if it will work with out a 4x4?

my truck is a 70 chevy 2 wheel drive with a 454 and th400 transmission

junkyardjohn · 03-09-2003, 11:22 PM

bowtie: WOW -- WHAT KIND OF HORSEPOWER ARE YOU PUTTING OUT?? I'M NOT TRYING TO PISS ON YOUR PARADE, SAY YOU GOT BAD ADVICE, OR SOUND LIKE A KNOW IT ALL, BELIEVE ME. BUT I'VE BEEN HOTRODDING THESE OLD TRUCKS FOR A LONG TIME (18 YEARS) & HAVE BUILT SEVERAL TRUCKS, THAT HAVE HAD BIG BLOCKS WITH WELL OVER 500 REAR WHEEL HORSEPOWER, & HAVE NEVER BROKEN A BELLHOUSING (OR CASE) ON A T-400. SOUNDS TO ME LIKE YOUR BARKING UP THE WRONG TREE. SOUNDS LIKE AN ALIGNMENT PROBLEM TO ME, OR YOUR CRACKING THE BELLHOUSING UPON INSTALLATION, & DON'T KNOW IT.

WHEN YOU HEAR HOOFBEATS.. DON'T LOOK AROUND EXPECTING ZEBRAS

Longhorn Man · 03-09-2003, 11:39 PM

Look at your drivers side motor mount. They like to fall apart and cause exsesive movement. The trans mount is probably hding the tranny better then teh engine mounts are.

72shadetree · 03-09-2003, 11:41 PM

i second the aligment problem unless you have a broke trans/motor mount

**too much stuff** · 03-09-2003, 11:50 PM

This may sound dumb, but make sure your engine does not have a pilot busching in the end of the crank for a standard tranny.I have seen this happen,but you should notice it when you bolt them together as you will be fighting it to get them together. Good luck.

adam122 · 03-09-2003, 11:55 PM

im not to sure on the Hp its puting out but I know its a lot. the trans and motor mounts are both brand new. ill look into the alignment thing next. This is the second time this has happend in 3 months both times the truck was in park and bein reved up to high rpms. mabye somone can help me out with how much hps I may be putting out that has desktop dyno

Longhorn Man · 03-10-2003, 12:15 AM

power levels shouldn't matter if the power isn't going anywhere...something is terribly wrong.
Are the dowl pins still on it? If it is not lined up perfect, it will destoyt eh tranny...but never seen one crack from it though.

Chevy Wrench · 03-10-2003, 03:02 AM

What grade of bell housing bolts are you using? You should use grade 5 or better. I had to buy a new trans case for a customer once because I used cheap bolts. Just a thought. Good luck.
-John

adam122 · 03-10-2003, 10:22 PM

I have grade 8 bolts. I have been calling around and a few people have told me to take out the left mount and bolt that side down solid. here is a pic i took today of the tranny I broke.

*racedvl* · 03-10-2003, 10:37 PM

Holy sh*t!!!!!

adam122 · 03-10-2003, 10:38 PM

take a look at the other thread I starte you can see both :/

Longhorn Man · 03-11-2003, 12:11 AM

WOW!

03-09-2003, 10:43 PM	#1
adam122 Registered User Join Date: Oct 2002 Posts: 15	Motor support question I posted on the other board about how I have broke the housing on two turbo 400 transmissions. I have been calling around tryin to figure out how it happened, and I was told that its possable that when reving the engine a lot that the back of the motor is picking up too much and ripping off the housing on the transmission. I was told in some 4x4 trucks there is some kind of support or mount that hooks to the back of the motor. Anyone know what this is, where i can get it and if it will work with out a 4x4? my truck is a 70 chevy 2 wheel drive with a 454 and th400 transmission

03-09-2003, 11:22 PM	#2
junkyardjohn Registered User Join Date: Aug 2001 Location: SOMERSET KY. Posts: 6,425	bowtie: WOW -- WHAT KIND OF HORSEPOWER ARE YOU PUTTING OUT?? I'M NOT TRYING TO PISS ON YOUR PARADE, SAY YOU GOT BAD ADVICE, OR SOUND LIKE A KNOW IT ALL, BELIEVE ME. BUT I'VE BEEN HOTRODDING THESE OLD TRUCKS FOR A LONG TIME (18 YEARS) & HAVE BUILT SEVERAL TRUCKS, THAT HAVE HAD BIG BLOCKS WITH WELL OVER 500 REAR WHEEL HORSEPOWER, & HAVE NEVER BROKEN A BELLHOUSING (OR CASE) ON A T-400. SOUNDS TO ME LIKE YOUR BARKING UP THE WRONG TREE. SOUNDS LIKE AN ALIGNMENT PROBLEM TO ME, OR YOUR CRACKING THE BELLHOUSING UPON INSTALLATION, & DON'T KNOW IT. WHEN YOU HEAR HOOFBEATS.. DON'T LOOK AROUND EXPECTING ZEBRAS __________________ junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE. THERES ROOM FOR ALL OF GODS CREATURES RIGHT NEXT TO MY MASHED POTATOES// LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST

03-09-2003, 11:41 PM	#4
72shadetree KEEP ON TRUCKING Join Date: Sep 2000 Location: martinsville va Posts: 2,563	i second the aligment problem unless you have a broke trans/motor mount __________________ 72 cheyenne 2wd lwb 71 k20 sons bassett va

03-09-2003, 11:55 PM	#6
adam122 Registered User Join Date: Oct 2002 Posts: 15	im not to sure on the Hp its puting out but I know its a lot. the trans and motor mounts are both brand new. ill look into the alignment thing next. This is the second time this has happend in 3 months both times the truck was in park and bein reved up to high rpms. mabye somone can help me out with how much hps I may be putting out that has desktop dyno Last edited by adam122; 03-09-2003 at 11:57 PM.

03-10-2003, 03:02 AM	#8
Chevy Wrench former desert rat Join Date: Feb 2003 Location: salt lake city, utah Home of the 3 M's Mormons, methlabs and minivans Posts: 320	What grade of bell housing bolts are you using? You should use grade 5 or better. I had to buy a new trans case for a customer once because I used cheap bolts. Just a thought. Good luck. -John __________________ 94 Chevy Silverado Ext cab 4/6 drop w/ 18's and 2500watt system (work truck). 67 Chevy swb under const. frame off custom, 20's, bagged and a large rat under the hood,and a 1940 Chevy truck under const.

03-09-2003, 11:39 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Look at your drivers side motor mount. They like to fall apart and cause exsesive movement. The trans mount is probably hding the tranny better then teh engine mounts are.

03-09-2003, 11:50 PM	#5
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,787	This may sound dumb, but make sure your engine does not have a pilot busching in the end of the crank for a standard tranny.I have seen this happen,but you should notice it when you bolt them together as you will be fighting it to get them together. Good luck.

03-10-2003, 12:15 AM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	power levels shouldn't matter if the power isn't going anywhere...something is terribly wrong. Are the dowl pins still on it? If it is not lined up perfect, it will destoyt eh tranny...but never seen one crack from it though.

03-10-2003, 10:22 PM	#9
adam122 Registered User Join Date: Oct 2002 Posts: 15	I have grade 8 bolts. I have been calling around and a few people have told me to take out the left mount and bolt that side down solid. here is a pic i took today of the tranny I broke. Attached Images

03-10-2003, 10:37 PM	#10
racedvl Account Suspended Join Date: Jan 2000 Location: Woodstock, IL Posts: 7,020	Holy sh*t!!!!!

03-10-2003, 10:38 PM	#11
adam122 Registered User Join Date: Oct 2002 Posts: 15	take a look at the other thread I starte you can see both :/

03-11-2003, 12:11 AM	#12
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	WOW!



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