I read somewhere that the short transmission support bracket on a C-1 that supports the rear of the 4-speed transmission has spacers installed between the bracket and the frame to help reduce the angle of the driveshaft. Is this correct? If so, what is the spacer depth? Neither my 59 or 62 had the spacers installed. I want to install them as I understand the angles of the u-joints are critical for long life.
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Re: C1 - 4-speed frame barcket spacers?
Mark...
No spacer's that I know of...Shim's were used on the crossmember to frame on '62's and should be added if you install a Muncie for '56-'61. I believe Corvette central has them. -
Re: C1 - 4-speed frame barcket spacers?
Mark...
No spacer's that I know of...Shim's were used on the crossmember to frame on '62's and should be added if you install a Muncie for '56-'61. I believe Corvette central has them.Comment
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Dennis, is this what you mean?
I borrowed this pic from the C Central catalogue and I think the part in question is on the lower left. But I am not sure how it works. Does it go between the crossmember and tranny somehow? Thanks. Pat G.
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Dennis, is this what you mean?
I borrowed this pic from the C Central catalogue and I think the part in question is on the lower left. But I am not sure how it works. Does it go between the crossmember and tranny somehow? Thanks. Pat G.
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Re: C1 - 4-speed frame barcket spacers?
There is a formula for checking the drive shaft angle that I had years ago ( may find it in old service manuals)
Some were installed between the rear trans tail housing and bracket to raise it and others between the trans cross support to frame four bolts to lower it.
It was usually done to correct a vibration not U joint angle wear .Also a tapered shim was put under the rear springs and banjo to change the Banjo housing angle if needed to further reduce vibration.Comment
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Re: C1 - 4-speed frame barcket spacers?
There is a formula for checking the drive shaft angle that I had years ago ( may find it in old service manuals)
Some were installed between the rear trans tail housing and bracket to raise it and others between the trans cross support to frame four bolts to lower it.
It was usually done to correct a vibration not U joint angle wear .Also a tapered shim was put under the rear springs and banjo to change the Banjo housing angle if needed to further reduce vibration.Comment
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Re: C1 - 4-speed frame barcket spacers?
The four bolts that attach the transmission crossmember to the frame are the points where I was going to add some spacers. Perhaps, based on what you have said, they are not necessary. I don't suppose it could hurt to add some washers to make up 1/4-inch or so, but the bolts supplied with both cars are not long enough to accomodate any spacers. Longer bolts will be needed if I add shims, washers, etc.Comment
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Re: C1 - 4-speed frame barcket spacers?
The four bolts that attach the transmission crossmember to the frame are the points where I was going to add some spacers. Perhaps, based on what you have said, they are not necessary. I don't suppose it could hurt to add some washers to make up 1/4-inch or so, but the bolts supplied with both cars are not long enough to accomodate any spacers. Longer bolts will be needed if I add shims, washers, etc.Comment
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Re: C1 - 4-speed frame barcket spacers?
Yes, there are shims or spacers on '62s that go in between the frame and the crossmember. They're about 1/8" thick. You'll see them, if you look carefully, in the AIM for '62s. They're either in the main section of the book with the standard 3 speed tranny, or at the end with the optional 4 speed tranny. They're hard to see on the page. Corvette Central doesn't show them in that picture. But they carry them under their p/n 531314. Note that the $3.90 price is each. You need 2. You also need these shims if you're installing a Muncie in any year C1. These shims/spacers are nothing more than 1/8" thick steel bar stock with 2 holes drilled in them.
Yes, you do want to use them. Very important for U-joint longevity, drivetrain vibration, and yoke clearance to the underside of the transmission tunnel. I don't think that 1 shim per side is enough. But Chevrolet did. Before I knew about these shims, I used wheel lug nuts as spacers. They're about 5/8" thick. In my opinion, you can't drop the back of the transmission down too far. Unless, of course, you hit the frame.Comment
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Re: C1 - 4-speed frame barcket spacers?
Yes, there are shims or spacers on '62s that go in between the frame and the crossmember. They're about 1/8" thick. You'll see them, if you look carefully, in the AIM for '62s. They're either in the main section of the book with the standard 3 speed tranny, or at the end with the optional 4 speed tranny. They're hard to see on the page. Corvette Central doesn't show them in that picture. But they carry them under their p/n 531314. Note that the $3.90 price is each. You need 2. You also need these shims if you're installing a Muncie in any year C1. These shims/spacers are nothing more than 1/8" thick steel bar stock with 2 holes drilled in them.
Yes, you do want to use them. Very important for U-joint longevity, drivetrain vibration, and yoke clearance to the underside of the transmission tunnel. I don't think that 1 shim per side is enough. But Chevrolet did. Before I knew about these shims, I used wheel lug nuts as spacers. They're about 5/8" thick. In my opinion, you can't drop the back of the transmission down too far. Unless, of course, you hit the frame.Comment
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Re: Dennis, is this what you mean?
Pat,
The part in the lower left of the picture is an adapter. Two holes bolt to the transmission mounting holes, the other two mount to the C1 transmission crossmember. The muncie trans mount is about (guessing) 2 1/2 or 3 inches short of the C1 crossmember.
Any spacing down is done between the crossmember and the frame.
Spacing up would be between the adapter and the crossmember.
VerleComment
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Re: Dennis, is this what you mean?
Pat,
The part in the lower left of the picture is an adapter. Two holes bolt to the transmission mounting holes, the other two mount to the C1 transmission crossmember. The muncie trans mount is about (guessing) 2 1/2 or 3 inches short of the C1 crossmember.
Any spacing down is done between the crossmember and the frame.
Spacing up would be between the adapter and the crossmember.
VerleComment
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Verle, now I can visualise it
If I understand it right, the front of this adapter bolts directly to the bottom of the Muncie and the rear of the adapter bolts to the original C1 rubber mounts. The original bracket, C Central #531302 is not used.
Well Bubba must have done the conversion on my '59. There is a rubber mount bolted directly to the Muncie and new holes were drilled into the crossmember a little further forward. All the original mounting hardware must have been discarded. Seems to work fine but I think it is still a little high. I may leave it like this but will make spacers to go between the frame and the tranny crossmember to lower it a tad. Thanks for the reply. Pat G.
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Verle, now I can visualise it
If I understand it right, the front of this adapter bolts directly to the bottom of the Muncie and the rear of the adapter bolts to the original C1 rubber mounts. The original bracket, C Central #531302 is not used.
Well Bubba must have done the conversion on my '59. There is a rubber mount bolted directly to the Muncie and new holes were drilled into the crossmember a little further forward. All the original mounting hardware must have been discarded. Seems to work fine but I think it is still a little high. I may leave it like this but will make spacers to go between the frame and the tranny crossmember to lower it a tad. Thanks for the reply. Pat G.
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