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Old 03-25-2014, 11:29 PM   #1
1968C20CST
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Thoughts on a b&m th400 & cpp trans crossmember

Have a opportunity to pick one up, I have read good and bad. Price seems right but input from actual users would be great! It would go behind the gm crate 350 I just bought that jegs had on sale and replace a 4 speed granny. It comes with a cpp transmission crossmember also brand new.
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Old 03-25-2014, 11:32 PM   #2
GASoline71
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Re: Thoughts on a b&m th400 & cpp trans crossmember

The TH400 was originally designed to handle the TQ of BBC's, so they will rob a little power from a stock SBC. But, that being said... they are the best 3 speed slush box The General ever made.

Gary
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Old 03-25-2014, 11:34 PM   #3
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Re: Thoughts on a b&m th400 & cpp trans crossmember

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Originally Posted by GASoline71 View Post
The TH400 was originally designed to handle the TQ of BBC's, so they will rob a little power from a stock SBC. But, that being said... they are the best 3 speed slush box The General ever made.

Gary
Can I offset that with the correct torque converter? And what would be the correct stall speed?
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Old 03-25-2014, 11:52 PM   #4
GASoline71
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Re: Thoughts on a b&m th400 & cpp trans crossmember

Is everything stock? Just use the stock converter.

Gary
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My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread.

The Rebuild of Creeping Death after the wreck

Quote:
Originally Posted by LONGHAIR View Post
I would never rebuild a 305.
Quote:
Originally Posted by prostreetC-10 View Post
I love using vacuum gauges as part of the carb tuning process. I hook the gauge to the inside of my garbage can and leave it there.
Quote:
Originally Posted by Marv D View Post
Remember Murphys 2nd law of mechanical relationships... "OPPOSING COMPONENTS ATTEMPTING TO OCCUPY THE SAME SPACE, AT THE SAME TIME, GENERALLY END UP OCCUPYING ADJOINING SPACE AT THE BOTTOM OF THE OIL PAN"
Quote:
Originally Posted by cableguy0 View Post
Its cheaper to listen to advice given when you ask for help than it is to ignore everyone and wait for carnage.
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Old 03-26-2014, 12:03 AM   #5
1968C20CST
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Re: Thoughts on a b&m th400 & cpp trans crossmember

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Originally Posted by GASoline71 View Post
Is everything stock? Just use the stock converter.

Gary
For the most part it will be close to stock I will use a edelbrock 1406 carb, edelbrock 2701 eps performer intake, mallory 8548201C & hyfire and true ram 2 1/2" ram horns.
I plan to upgrade heads and cam down the road.

I do not have a torque converter at this point, I will have to source one if I buy the th400.
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Old 03-26-2014, 08:33 AM   #6
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Re: Thoughts on a b&m th400 & cpp trans crossmember

TH400 is a great transmission so if you want to get rid of the manual it's a great choice. Depending on your plans for the truck though you might be better served looking for something with an overdrive.
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Old 03-26-2014, 06:04 PM   #7
1968C20CST
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Re: Thoughts on a b&m th400 & cpp trans crossmember

I know the the TH400 is a bullet proof transmission, I am looking for those of you with experience with the ones produced by B&M. I know some of you have to had some experience with them. Would you pick a new one up if the price was comparable to a rebuild?
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Old 03-26-2014, 06:43 PM   #8
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Re: Thoughts on a b&m th400 & cpp trans crossmember

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Originally Posted by 1968C20CST View Post
I know the the TH400 is a bullet proof transmission, I am looking for those of you with experience with the ones produced by B&M. I know some of you have to had some experience with them. Would you pick a new one up if the price was comparable to a rebuild?
I have the B&M T400 behind a 450 HP 383 with a Gear Vendors OD and I have had no problems with it. I had it rebuilt and a shop in LA built the TC to match the gears and HP I have.
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