[C1] Driveline Angle
10-25-2018, 08:03 AM
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Driveline Angle
Reading another thread, I got to wondering about driveline angle on C1’s. My transmission mount has about 3/16” thick spacers but I wonder if I might need more, I still get a little vibration at higher RPM.
What spacer thickness did you guys end up with?
What spacer thickness did you guys end up with?
10-25-2018, 08:06 AM
#2
Team Owner
Last edited by Frankie the Fink; 10-25-2018 at 09:16 AM.
10-25-2018, 09:01 AM
#3
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Vary possibly I should not butt in but I think FTF means make sure the pinion and transmission center lines are equal and opposite.
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10-25-2018, 09:20 AM
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I'm doing a ground up restoration on a 60 with a 63 t-10 instead of the original 3sp, so I had to research this issue because I have nothing to measure at this time. I followed Tom Parsons recommendation. I used the adapter for later tranny and dropped the cross member 1". Chip
10-25-2018, 03:32 PM
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Measure first, then shim as required.
Interesting video demonstration here....
https://shiftsst.com/articles/driveline-angles
Interesting video demonstration here....
https://shiftsst.com/articles/driveline-angles
10-25-2018, 03:56 PM
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Measure first, then shim as required.
Interesting video demonstration here....
https://shiftsst.com/articles/driveline-angles
Interesting video demonstration here....
https://shiftsst.com/articles/driveline-angles
10-25-2018, 04:37 PM
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The U-joint angles on 53-62 Corvettes is already quite severe in the stock configuration. Probably the most severe of any car with a conventional front engine/transmission-driveshaft-rearend.
The transmission mount pad on 53-61 Corvette transmission tail housings is HIGHER than it is on 62-later transmissions.
Below is a T10 tail housing which has BOTH 61-earlier style and 62-later style transmission mount pads on the tail housing. As can be clearly seen, when using the FORWARD mount pad, it would raise the rear of the transmission about 1in-----------------------MAKING U-JOINT ANGLES EVEN MORE SEVERE!!!! In 1962 ONLY, a spacer, about 1/8in thick, was installed between the X-member of the frame and the transmission cross member----------------------------NOT ENOUGH (in my opinion)!!!!!
SOOOOOOOOOOOOOO, when installing a 62-later 4sp in a 55-62 Corvette, the 1962 ONLY mount plate can be used and about 1in spacers (again, in my opinion) installed between the X-member and transmission cross member (as shown in the lower 3 pictures). This method of mounting a 62-later transmission (such as a 62-63 T-10 or Muncie) in a 55-61 Corvette will reduce the severity of the U-joint angles (NOT enough, but better).
The below transmission mounting setup has been in my 56 for 45yrs with ZERO issues.
The transmission mount pad on 53-61 Corvette transmission tail housings is HIGHER than it is on 62-later transmissions.
Below is a T10 tail housing which has BOTH 61-earlier style and 62-later style transmission mount pads on the tail housing. As can be clearly seen, when using the FORWARD mount pad, it would raise the rear of the transmission about 1in-----------------------MAKING U-JOINT ANGLES EVEN MORE SEVERE!!!! In 1962 ONLY, a spacer, about 1/8in thick, was installed between the X-member of the frame and the transmission cross member----------------------------NOT ENOUGH (in my opinion)!!!!!
SOOOOOOOOOOOOOO, when installing a 62-later 4sp in a 55-62 Corvette, the 1962 ONLY mount plate can be used and about 1in spacers (again, in my opinion) installed between the X-member and transmission cross member (as shown in the lower 3 pictures). This method of mounting a 62-later transmission (such as a 62-63 T-10 or Muncie) in a 55-61 Corvette will reduce the severity of the U-joint angles (NOT enough, but better).
The below transmission mounting setup has been in my 56 for 45yrs with ZERO issues.
10-25-2018, 05:00 PM
#8
I dropped mine an inch when installing a Tremec 5 speed, and that is about the limit without the driveshaft hitting the top of the frame at the X member. Like most modifications, it has a ripple effect. I had to fabricate a higher clutch bar mount on the bellhousing, and grind down some on the firewall hole for my fuel injection tach drive cable.
Last edited by Loren Smith; 10-25-2018 at 05:02 PM.
10-25-2018, 05:21 PM
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10-25-2018, 06:05 PM
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When i made the rear trans mount for the Doug Nash 5 speed, i also arranged so that the U joint clears the plate on top of the X member by only about 1/4".
Doug
Doug
10-25-2018, 11:26 PM
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The U-joint angles on 53-62 Corvettes is already quite severe in the stock configuration. Probably the most severe of any car with a conventional front engine/transmission-driveshaft-rearend.
The transmission mount pad on 53-61 Corvette transmission tail housings is HIGHER than it is on 62-later transmissions.
Below is a T10 tail housing which has BOTH 61-earlier style and 62-later style transmission mount pads on the tail housing. As can be clearly seen, when using the FORWARD mount pad, it would raise the rear of the transmission about 1in-----------------------MAKING U-JOINT ANGLES EVEN MORE SEVERE!!!! In 1962 ONLY, a spacer, about 1/8in thick, was installed between the X-member of the frame and the transmission cross member----------------------------NOT ENOUGH (in my opinion)!!!!!
SOOOOOOOOOOOOOO, when installing a 62-later 4sp in a 55-62 Corvette, the 1962 ONLY mount plate can be used and about 1in spacers (again, in my opinion) installed between the X-member and transmission cross member (as shown in the lower 3 pictures). This method of mounting a 62-later transmission (such as a 62-63 T-10 or Muncie) in a 55-61 Corvette will reduce the severity of the U-joint angles (NOT enough, but better).
The below transmission mounting setup has been in my 56 for 45yrs with ZERO issues.
The transmission mount pad on 53-61 Corvette transmission tail housings is HIGHER than it is on 62-later transmissions.
Below is a T10 tail housing which has BOTH 61-earlier style and 62-later style transmission mount pads on the tail housing. As can be clearly seen, when using the FORWARD mount pad, it would raise the rear of the transmission about 1in-----------------------MAKING U-JOINT ANGLES EVEN MORE SEVERE!!!! In 1962 ONLY, a spacer, about 1/8in thick, was installed between the X-member of the frame and the transmission cross member----------------------------NOT ENOUGH (in my opinion)!!!!!
SOOOOOOOOOOOOOO, when installing a 62-later 4sp in a 55-62 Corvette, the 1962 ONLY mount plate can be used and about 1in spacers (again, in my opinion) installed between the X-member and transmission cross member (as shown in the lower 3 pictures). This method of mounting a 62-later transmission (such as a 62-63 T-10 or Muncie) in a 55-61 Corvette will reduce the severity of the U-joint angles (NOT enough, but better).
The below transmission mounting setup has been in my 56 for 45yrs with ZERO issues.
10-25-2018, 11:36 PM
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The reason I posted this was I felt most C1 owners would use close to the same thickness shims, given you have a 4 speed T10, same rear end and suspension, same transmission mount, stock frame, etc. I know there are going to be deviations but I would just like to know if most of us use a 1/16” shim or a 1”.
10-26-2018, 02:06 AM
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St. Jude Donor '07
with the Muncie and the MY6 I used about 5/8-3/4"; actually the thickness of the oversized nut I slid over the bolts as a spacer....
with the SS700 I used tapered shims between the spring and spring pads as the driveshaft is even shorter.
Bill
with the SS700 I used tapered shims between the spring and spring pads as the driveshaft is even shorter.
Bill
Last edited by wmf62; 10-26-2018 at 02:08 AM.
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