C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

C-beam lengths

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Old Mar 15, 2014 | 11:47 PM
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Default C-beam lengths

Are there different lengths of c-beams ?. Have th350trans.Mine is bolted to last holes in tranny and c-beam .Anybody know easy fix.
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Old Mar 16, 2014 | 12:16 AM
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Originally Posted by mizzys 86
.Anybody know easy fix.
Fix for what?

Originally Posted by mizzys 86
Are there different lengths of c-beams ?
There are 2 lengths depending upon whether the beam is off a car with a D36 or D44 diff
The D44 is longer so it's corresponding C-Beam is shorter

Difference in length when a D36 beam used on a D44.






Some redrill the holes instead of getting a D44 beam when doing a diff swap



Last edited by vetteoz; Mar 16, 2014 at 12:22 AM.
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Old Mar 16, 2014 | 12:47 AM
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Thanks mine had engine and trans swap the th350 has a short housing, leaving it bolted to last hole on trans i was thinking of bolting piece off steel in c -beam holes and extended to front hole with spacer to make up diff with c-beam think it will work?
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Old Mar 16, 2014 | 01:53 AM
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Originally Posted by mizzys 86
Thanks mine had engine and trans swap the th350 has a short housing, leaving it bolted to last hole on trans i was thinking of bolting piece off steel in c -beam holes and extended to front hole with spacer to make up diff with c-beam think it will work?
I believe that a TH350 for a C4 requires a kit from these people to do it easily. From this list I believe it was the 7-35C. It would require a phone call I guess.

http://www.teckpak.com/dept.cfm?dpt=5&cat=21

It could be done like this I guess using a fabricated adapter to use the C-beam:



OR if you've already got the C4 extension mounted machine the height of the C-beam mount to use a beam that could be bolted to the c-beam mounts and adapted to what you have. Similar to the snapshot above but to the C4 extension.

Do you have a functional speedo or you don't care?

If you had already the correct output shaft you could likely buy just the spacer from Fitzall. I believe the TH350 needed is the 9" tail-shaft version.

Last edited by WVZR-1; Mar 16, 2014 at 02:10 AM.
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Old Mar 16, 2014 | 11:34 AM
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Thanks no speedo
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Old Mar 16, 2014 | 06:40 PM
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needs to be the 9" tail shaft with spacer...
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Old Mar 17, 2014 | 01:07 PM
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Originally Posted by project C4
needs to be the 9" tail shaft with spacer...
tHAT WOULD PUT IT TOO FAR BACK i just need the the beam to be the distance from the last hole to the first hole .DO BEAMS COME IN DIFFERENT LENGTHS?
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Old Mar 17, 2014 | 01:22 PM
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Originally Posted by mizzys 86
tHAT WOULD PUT IT TOO FAR BACK i just need the the beam to be the distance from the last hole to the first hole .DO BEAMS COME IN DIFFERENT LENGTHS?
Yes - there are 2 C-beams. One for a D36 rear application regardless of transmission and another for a D44 regardless of transmission application. The transmission application of course does need to be "dimensionally correct" for a C4 application and your TH350 is NOT.

"ProjectC4" shows a TH350 that if in a build with a D36 would use a D36 C-beam with no modifications OR it could be used with a D44 C-beam in a build with a D44 C-beam.

What exactly do you have for a build?

Last edited by WVZR-1; Mar 17, 2014 at 01:26 PM.
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Old Mar 17, 2014 | 03:27 PM
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Originally Posted by mizzys 86
tHAT WOULD PUT IT TOO FAR BACK i just need the the beam to be the distance from the last hole to the first hole .DO BEAMS COME IN DIFFERENT LENGTHS?
No it won't.

FYI - I use a 9" output TH350 in my 84 Corvette Drag car. I have the cast alum spacer kit shown above and re-used the tail shaft housing from the 84's orginal 700R4.....

A 9" output shaft TH350 is within 1/2" OAL of a 700R4/4L60. It will bolt right up as long as you have the correct length C-Beam for whatever rear end you have under the car. It will bolt right up.

As said twice above, there are 2 different length C-Beams. One for the D36 and one for the D44.... The D44 C-Beam is about 2" shorter but you can cut off and re-drill the longer D36 C-Beams to work with a D44 (also shown in the pics above).

Will
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Old Mar 17, 2014 | 03:31 PM
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Originally Posted by WVZR-1
Yes - there are 2 C-beams. One for a D36 rear application regardless of transmission and another for a D44 regardless of transmission application. The transmission application of course does need to be "dimensionally correct" for a C4 application and your TH350 is NOT.

"ProjectC4" shows a TH350 that if in a build with a D36 would use a D36 C-beam with no modifications OR it could be used with a D44 C-beam in a build with a D44 C-beam.

What exactly do you have for a build?
i just bought the car,all i know is it has a 383 with a th350 trans..got under car and saw where the last bolt on c beam was not where it should be it was on the last hole of tranny,not good. by addin spacer wouldnt it put it too far back, could i put 700r tailshat and housing on . thanks
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Old Mar 17, 2014 | 03:33 PM
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how do i tell diff rears
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Old Mar 17, 2014 | 05:28 PM
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Originally Posted by mizzys 86
how do i tell diff rears
Across the top of the cover there is either 3 bolt (L - R & center) or there is just 2 (L & R).

2 - bolt is D44 and the 3 bolt is D36.


Last edited by WVZR-1; Mar 17, 2014 at 05:30 PM.
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Old Mar 17, 2014 | 06:56 PM
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Originally Posted by WVZR-1
Across the top of the cover there is either 3 bolt (L - R & center) or there is just 2 (L & R).

2 - bolt is D44 and the 3 bolt is D36.

have d36 beam is 407/8 total length _+1/4 do to eye site thanks for the help great forum
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