Discussion Forum - Northstar Chevelle Club

4-door Chevelle · Super Poster

Cracked Tranny Housing

dashboard · 2K+ Club

I can't see your finger.

Lost in the 60s · President

That's what you hot rodders get, drag racing your cars... emote.img?ID=15264

Looks like replacement case time. No cutouts for you, junior... emote.img?ID=15280

Tony Hoffer · Moderator

This used to happen a lot when people mixed solid (engine/Trans) with rubber (engine/trans) mounts.

yellowbowtie · Member

I have a extra turbo 350 if you want it come get it

Dave Seitz · Mega Poster

Seth had the same problem used 3 trans to make 1.

SShink · 3K+ Club

Here's a core for you:

http://minneapolis.craigslist.org/ank/pts/2250892490.html

4-door Chevelle · Super Poster

Fortunately my new Chevelle has a good tranny in it so I will just put a fresh B&M Transpack shift kit in it. Yes, it is sometimes the price you pay when you start to make some power ... you find the weak link. I do actually run stock rubber mounts on the motor and tranny. Thanks for the offer Ian, the way things are going I should grab it for a spare!?!

Bungy L-76 · Active Member

Sounds like a good excuse to go to a manual to me. emote.img?ID=15283

Bowtieman427 · Active Member

Tony Hoffer wrote:

This used to happen a lot when people mixed solid (engine/Trans) with rubber (engine/trans) mounts.

I heard of this also and do not want it to happen to me. I thought the issue was the tranny was to solidly mounted and not budging under high acceleration. My current solution has ES poly engine mounts and I was going to run a ES poly on tranny, but have been thinking a rubber mount on tranny may be better to avoid this issue.

I heard of people running solid on driver, Poly on passenger and rubber on tranny and issue was resolved. Kind of opposite what you heard : (
Need some direcion of best solution to avoid this isssue.
My origianl thoughts poly on all three points would have the same amount of give other thought rubber on tranny would let the tranny give more to the where the engine is going to avoid cracking. Not sure if this will work or what the best would be.

Talked to Sput's he had the same issue on drag car with TH350 he said the frame actually was the issue and he had to modify as it flexed alot with his high HP motor. Once he reinforced the frame problem went away. Remember this was a drag car 55 Chevy.

THOUGHTS IDEAS SUGGESTIONS ?

Tony Hoffer · Moderator

If you have high horsepower or race it just another maintenance point that should be inspected periodically.

I only have about 540 horsepower and have had no problems ( yet) running the Energy suspension poly mounts all around.

Bowtieman427 · Active Member

ONLY 540HP.............. that is a lot of power : )