Clutch linkage picture 66 GMC V6 w/ SM420

[66 GMC 351E]

Any chance to get that picture Jimmy?

[wc63]

Thanks for the Deer Valley Auto plug. I have been looking all week for a yard with some 60-66 GMCs/Chevys and cant find one in Mesa, Az. I found a guy in Apache Junction that only has a cab, with no doors. Do you know if they have several of these trucks there, or at least a complete one. Also, i googled Deer Valley and only found Glendale Auto Parts. Is that the same yard?

[66-PMD-GMC]

Originally Posted by 66 GMC 351E

Ron,
Are you sure the bell crank (z-bar) is the same on both Chevy and GMC? Particularly, the GMC V6? I found one in a junk yard yesterday from a 65 Chevy with a small block in it. It's completely different from mine, yet it looks like the one in the manual and all the catalogs I've seen. Classic Parts has a great picture of it online and in the description it says, "Fits 63-66 Pickups and Suburbans w/250, 292, 283, and 327 engines." No mention of GMC V6, 305 or 351. Maybe someone with a 305 V6 or 351 V6 with a mechanical clutch can post a picture of theirs? Here's a picture of the one off my truck (top) above the one pulled from the '65 Chevy.

Not only are the bell cranks (Z-bars) different for chevy and GMC, so are the clutch peddles as the bracket that bolts to the peddle shaft that the rod goes on is "clocked" differently between the Chevy and GMC. Chevy pulls the bell crank and GMC pushes the bell crank. V6, L6 and V8 are different.

[padresag]

so in a GMC would the v6 and the I6 use the same bell crank or would they be different from one another?
ron

[66-PMD-GMC]

I did a V6 to L6 conversion.
Had to change the frame bracket, frame bracket location, bell crank, all the rods AND the clutch peddle.
The V6 bell crank is pushed by the clutch peddle rod coming through the fire wall and the L6 is pulled.
To convert, you have to "flip" the little arm on the end of the peddle shaft but it is "clocked" requiring the whole peddle to be swapped out.
I can take photos if necessary.

[padresag]

thanks for the clarification. one learns something everyday. sometimes it is difficult to rationalize the differences
ron

[66-PMD-GMC]

The differences make complete sense to me now that I have explored the different motor transmission combinations.
I started all of this by installing a Pontiac engine in my 66 V6 truck thinking everything would line right up. WRONG!
Then I changed out the Pontiac to a straight 6 for gas milage, again everything in the clutch department is different.
Then I find a 63 short bed with a V8 that was originally a straight 6 and the PO tells me he cut out the rear cross member and went automatic because he couldn't get a clutch to work. I check out the parts he throws in with the deal and see yet another clutch setup. Thats when I started to seriously research the clutch setups in Chevy and GMC trucks...
One size doesn't fit all in these bad boys thats for sure.
I am still looking for an original V8 bell crank frame bracket and would like to compare that with the V6 as I am convinced it will be different.

[kieth]

Originally Posted by 66 GMC 351E

Ron,
Are you sure the bell crank (z-bar) is the same on both Chevy and GMC? Particularly, the GMC V6? I found one in a junk yard yesterday from a 65 Chevy with a small block in it. It's completely different from mine, yet it looks like the one in the manual and all the catalogs I've seen. Classic Parts has a great picture of it online and in the description it says, "Fits 63-66 Pickups and Suburbans w/250, 292, 283, and 327 engines." No mention of GMC V6, 305 or 351. Maybe someone with a 305 V6 or 351 V6 with a mechanical clutch can post a picture of theirs? Here's a picture of the one off my truck (top) above the one pulled from the '65 Chevy.

I just pulled the clutch linkage out of my 66 gmc with a 250 6 cylinder (i installed a 700r4 and a 350) the clutch linkage looks just like the dirty lower one in the above picture (it has a grease fitting on it, and it is bent like the one shown.) Kieth

[66-PMD-GMC]

Originally Posted by kieth

I just pulled the clutch linkage out of my 66 gmc with a 250 6 cylinder (i installed a 700r4 and a 350) the clutch linkage looks just like the dirty lower one in the above picture (it has a grease fitting on it, and it is bent like the one shown.) Kieth

That would be correct. The bent bell crank is for the 6 cyl application.
I have photos of over a dozen bone stock original setups and I am seeking out more.
I think it is good information to collect and share.

[padresag]

what we need to see if someone can show us is a zbar that comes out of a v6 eng equipped truck as this is the the only one that seems to be in question
ron

[66 GMC 351E]

Originally Posted by 66-PMD-GMC

That would be correct. The bent bell crank is for the 6 cyl application.
I have photos of over a dozen bone stock original setups and I am seeking out more.
I think it is good information to collect and share.

Do you have a picture of the clutch pedal set-up for the V6 that you can post?

[monolith]

1964 GMC 1/2 ton 305 V6- hope this helps.

[padresag]

i can see what is happening now. it is located further back as it attaches to the bellhousing. it is also a little shorter. so there are 2 different zbars; 1 for the v6 and another one for all of the rest of the engines. the v8 ballstuds differ from the I6 ones
ron

[monolith]

1964 Chevy K14 Suburban, V8

[66-PMD-GMC]

Originally Posted by padresag

i can see what is happening now. it is located further back as it attaches to the bellhousing. it is also a little shorter. so there are 2 different zbars; 1 for the v6 and another one for all of the rest of the engines. the v8 ballstuds differ from the I6 ones
ron

No, the V8 and V6 are different too. Also, look close. The V6 pushes the top arm forward to disengage the clutch. The V6 pulls the peddle side arm on the bell crank.
This makes the peddle different too.

[66-PMD-GMC]

sorry, the 4X4 and 2X4 are different and in different locations on the frame and block

[padresag]

Originally Posted by 66-PMD-GMC

No, the V8 and V6 are different too. Also, look close. The V6 pushes the top arm forward to disengage the clutch. The V6 pulls the peddle side arm on the bell crank.
This makes the peddle different too.

that is basically what I said. there is one for the v6 and another for all the rest, which includes 230,250,283,292 and 327. the ball st6ud is different in the second group between the I6 and the v8. I am not familiar with the v6 ballstud.
ron

[padresag]

Originally Posted by 66-PMD-GMC

sorry, the 4X4 and 2X4 are different and in different locations on the frame and block

,
which are you referring to v6 applications in gmc or all?
ron

[66-PMD-GMC]

Originally Posted by padresag

,
which are you referring to v6 applications in gmc or all?
ron

In GMC there are two setups, the V6 bell crank 60-66 and the L6 65 and 66.
GMC state side did not offer a V8 in their trucks.
I have seen a total of 3 different bell cranks on different applications in Chevy but one looks exactly like the V6 GMC bell crank mounted in the rear position.

[66-PMD-GMC]

Here is the V6 bell crank from my 66 GMC.

[padresag]

Originally Posted by 66-PMD-GMC

sorry, the 4X4 and 2X4 are different and in different locations on the frame and block

what application?
ron