C beam difference

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May 3, 2002 | 05:40 PM

GRX

Thread Starter

Le Mans Master

Joined: Jul 2001

Posts: 6,252

Likes: 2

From: Silicon Valley Kalifornia

C beam difference

Does the L98 auto tranny come with a different C beam than the 4+3 or ZF?

May 3, 2002 | 05:47 PM

SPD DMN

Le Mans Master

Joined: Oct 1999

Posts: 9,713

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From: Sachse Texas

Cruise-In I Veteran

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Re: C beam difference (GRX)

Yes. The auto and manual C-beams are different length.

May 3, 2002 | 10:07 PM

Rich B.

Melting Slicks

Joined: Aug 2001

Posts: 2,516

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From: Lockport NY

Re: C beam difference (Vette92)

Quote:

Yes. The auto and manual C-beams are different length.

I thought that was odd, so I'm checking the parts book...

There's 3 different C-beams from '84 to '91...

Support, Driveline (1984)(1985 A.T.)(1986-91 exc G87) 14091265
Support, Driveline (1985 M.T.) 14084007
Support, Driveline (1986-91 G87) 14091264

G87 is the 8.5" ring gear (Dana 44?) and G89 is 7.5" ring gear (Dana 36?)...So that would seem to be correct...

1985 M.T. seems to be unique... :crazy:

[Modified by Rich B., 9:09 PM 5/3/2002]

May 6, 2002 | 10:02 AM

GRX

Thread Starter

Le Mans Master

Joined: Jul 2001

Posts: 6,252

Likes: 2

From: Silicon Valley Kalifornia

Re: C beam difference (Rich B.)

So the ZF 6speed uses???

May 6, 2002 | 06:15 PM

Rich B.

Melting Slicks

Joined: Aug 2001

Posts: 2,516

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From: Lockport NY

Re: C beam difference (GRX)

Quote:

So the ZF 6speed uses???

If you believe the parts book, the 4+3 and ZF use the same c-beam. I've read posts here from auto-to-ZF users who simply re-drilled the holes in the c-beam for the new trans/diff hole location, so I'm guessing the auto c-beam is the longer one. So if you're looking at picking one up, the auto c-beam could be used in either configuration (with maybe some new holes).

Anyone else? :chevy

May 7, 2002 | 02:16 AM

Bill Reid

Le Mans Master

Joined: Nov 2000

Posts: 7,391

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From: Chandler AZ

Re: C beam difference (GRX)

Quote:

Does the L98 auto tranny come with a different C beam than the 4+3 or ZF?

Yes...

The auto tranny c beam is about an inch longer... with the auto driveshaft about 1/2 inch longer. I've done the conversion from Dana36 to Dana44 and used manual tranny c-beam and driveshaft when I converted...