TH 400 differences between sbc and bb

[Michael H.]

Re: TH 400 differences between sbc and bb

Forward clutch count.

[Michael H.]

Re: TH 400 differences between sbc and bb

Intermediate Clutch count. (2nd gear)

[Michael H.]

Re: TH 400 differences between sbc and bb

Direct clutch count.

[Michael H.]

Re: TH 400 differences between sbc and bb

As seen in the clutch plate chart, there's an almost endless number of different combinations of clutch plates. Some have several waved steel plates, others, just one, or none.

The wave plates cushion the clutch application which results in a smoother shift from one speed to the next. Luxury passenger cars typically have more wave plates than performance cars, and the same is true for cars with larger engines/more HP.

If a clutch pack (and other related items) designed for a Cadillac is used in a muscle car, the added torque will cause a slow clutch apply or overspeed during the gear change and this will eventually burn the clutch plates.

I would be very surprised if all/any of the part numbers are still available from GM. Some may be available under newer/changed part numbers though.

To convert to the six disc direct clutch pack, a unique clutch drum piston is required. I doubt if it's available though.

[Mike E.]

Re: TH 400 differences between sbc and bb

Michael,
If you want to email those files to mike.eby@acdnow.com I can turn them into a PDF and post them on my server.

Mike

[Michael H.]

Re: TH 400 differences between sbc and bb

Michael,
If you want to email those files to mike.eby@acdnow.com I can turn them into a PDF and post them on my server.

Mike

Mike

Files sent.

[Joe L.]

Re: TH 400 differences between sbc and bb

As seen in the clutch plate chart, there's an almost endless number of different combinations of clutch plates. Some have several waved steel plates, others, just one, or none.

The wave plates cushion the clutch application which results in a smoother shift from one speed to the next. Luxury passenger cars typically have more wave plates than performance cars, and the same is true for cars with larger engines/more HP.

If a clutch pack (and other related items) designed for a Cadillac is used in a muscle car, the added torque will cause a slow clutch apply or overspeed during the gear change and this will eventually burn the clutch plates.

I would be very surprised if all/any of the part numbers are still available from GM. Some may be available under newer/changed part numbers though.

To convert to the six disc direct clutch pack, a unique clutch drum piston is required. I doubt if it's available though.

Michael------


Of the 10 clutch plates used for 1968-72 applications, 4 remain available under their original or supercessive part numbers and 6 are discontinued without supercession.

[Dick W.]

Re: TH 400 differences between sbc and bb

I would venture to guess that B&M would have any and all the clutches and other parts you would need

[Joe L.]

Re: TH 400 differences between sbc and bb

I would venture to guess that B&M would have any and all the clutches and other parts you would need

Dick-----

I was referring only to the GM parts. Without a doubt these parts are available in the aftermarket, from B&M or otherwise. There are just too many of these transmissions out there for there not to be replacement parts from some source.

[Mike E.]

Re: TH 400 differences between sbc and bb

Mike

Files sent.

PDF Version here.

In Adobe Acrobat use Shift-Ctrl + or Shift-Ctrl - to rotate page.

Mike

[Terry M.]

Re: TH 400 differences between sbc and bb

PDF Version here.

In Adobe Acrobat use Shift-Ctrl + or Shift-Ctrl - to rotate page.

Mike

When I do Shft-Ctrl - or Shft-Ctrl + the image gets smaller or larger. I suppose it has something to do with the version of Acrobat I have (free) or I would rather blame Bill Gates and his cursed Windows 8.1. However, I found at the right of the Acrobat toolbar is the icon >>. A left click there reveals a drop down box with rotate options as well as 'got to top' and 'go to bottom' options.

Thanks Mike E for hosting these. I have saved them to my computer thus making them far easier for me to find than the book Mike H got them from. At least until this box bites the big one.

[Kenneth B.]

Re: TH 400 differences between sbc and bb

Michael,Yes, the "CY" transmission was used with '69 L-88, L-89, L-71, and the Camaro / Chevelle / Nova 396 /375 HP .

I had on in my 1969 Camaro 375 HP conv. It was unbelievable. It shifted with a bang like a 4 speed. I loved it & I am a 4-speed guy

[Terry M.]

Re: TH 400 differences between sbc and bb

Michael,

Yes, the "CY" transmission was used with '69 L-88, L-89, L-71, and the Camaro / Chevelle / Nova 396 /375 HP .

What transmission was in the 1970 Camaro L1 Automatic?

[Kenneth B.]

Re: TH 400 differences between sbc and bb

What transmission was in the 1970 Camaro L1 Automatic?

It was the CY version. Book lists M40 base as a 237.60 cost & when ordered with the Z-28 it was a cost of 306.25 so I assume it was the heave duty.

[Michael H.]

Re: TH 400 differences between sbc and bb

Mike

Files sent.

Thanks Mike

The charts are much easier to read now. The pages make it a lot easier to understand than the GM parts book.

Trying to sort through the GM parts book for TH400 clutch plates was always very confusing for everyone.