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Old 07-10-2006, 07:37 AM
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Cracked T350 case again

For the second time I've cracked the case of a turbo 350 trans in my car. The first time was doing hard launches at the strip. The second time with a different T350 it happened just bipping the throttle going around a corner.It's behind a 500hp 383 chevy , Hughes convertor that flashes to 3800rpm in a big heavy 70 Monte Carlo. Whats the solution? A Turbo 400 maybe a mid-mount engine plate , indexing the trans/ engine centerline? Suggestions please. By the way these are proffesionally rebuilt transmissions.

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Old 07-10-2006, 08:03 AM
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I had a friend with a 600hp 468 '70 SS Chevell who kept having the same problem. He went with a trany from TCI and never had any more trouble.
http://www.tciauto.com/
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Old 07-10-2006, 12:09 PM
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By chance are you using solid motor mounts and rubber or urathane on the trans.?
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Old 07-10-2006, 01:00 PM
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Polyurethane mounts . Energy suspensions.
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Old 07-10-2006, 01:07 PM
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Oops sorry. Polyurethane all the way around , engine and trans.
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Old 07-10-2006, 01:10 PM
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Jw Ultra Bell Part #92452
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Old 07-10-2006, 07:11 PM
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only thing i could think is driveline alignment

but if everything is for sure lined up good and straight then i dunno

interesting
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Old 07-10-2006, 08:31 PM
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Cracked 350

If both trannies are cracked across the top, just about where the"bellhousing" area reaches its smallest point near the pump , then yes you might check the trans index to eng. centerline, and your dowell depth and locations. you might need offset dowell pins to corect mis-alaignment.
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Old 07-11-2006, 06:16 AM
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Yep , thats the crack.
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Old 07-11-2006, 06:53 AM
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I had the same type of crack in my Nova. I found that the trans case was touching the trans tunnel in the floor. I lowered the trans mount a quarter inch and had the case welded. Problem solved.
Bob
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