1957 Trans mount spacers
07-17-2018, 05:51 PM
#1
Racer
Thread Starter
1957 Trans mount spacers
How do I know if I need any spacers at the trans mount?
I am returning the '57 to its 4 speed (Muncie) and the PO who put in a "66 or so aluminum PG had no spacers and a weird trans mount.
I have put in a std. crossmember and have no idea how to assess whether or not I need any spacers. Help and suggestions will be appreciated.
Also everything is bolted up except for the driveshaft and I have .40 clutch release measured at the disc. Is this enough? I know that SWCDuke says .480.
I have not yet hooked up the driveshaft but wonder if the is enough clearance for the Muncie trans. Also, the clutch pedal comes back about 1/2 in short and needs to be pulled back with my toe to get the clearance for the TO bearing. I was thinking about another return spring to clear the TO bearing from the clutch fingers.
Any thoughts, something that I am missing about this install?
Thanks,
Dennis
I am returning the '57 to its 4 speed (Muncie) and the PO who put in a "66 or so aluminum PG had no spacers and a weird trans mount.
I have put in a std. crossmember and have no idea how to assess whether or not I need any spacers. Help and suggestions will be appreciated.
Also everything is bolted up except for the driveshaft and I have .40 clutch release measured at the disc. Is this enough? I know that SWCDuke says .480.
I have not yet hooked up the driveshaft but wonder if the is enough clearance for the Muncie trans. Also, the clutch pedal comes back about 1/2 in short and needs to be pulled back with my toe to get the clearance for the TO bearing. I was thinking about another return spring to clear the TO bearing from the clutch fingers.
Any thoughts, something that I am missing about this install?
Thanks,
Dennis
07-17-2018, 10:30 PM
#2
Le Mans Master
You might need a spacer to get enough clearance between the drive shaft and the tunnel . I had to make a spacer to keep my drive shaft from rubbing the tunnel .
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PattiR (07-17-2018)
07-17-2018, 10:52 PM
#3
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Dennis,
IF YOU HAVE A MUNCIE IN YOUR CAR, here is what you need.
You need the factory stock transmission cross member, with stock rubber mount, which bolts to the frame X-member with 2 bolts/nuts on each side.
You need the factory stock 62 (ONE YEAR ONLY) rear mount plate-------------------which is available from all the aftermarket Corvette vendors (Corvette Central, Paragon, etc) for about $20.
Because of the difference in the mount pad on 57-61 transmission tail housings and the mount pad on the Muncie tail housing, the transmission cross member needs to be dropped about 1in. I did this using 1in square tubing and longer bolts.
All of this is shown below.
These cars came from the factory with somewhat extreme U-joint angles.
An additional benefit of dropping the rear of the transmission is that it will lessen the severe angle of the U-joints.
IF YOU HAVE A MUNCIE IN YOUR CAR, here is what you need.
You need the factory stock transmission cross member, with stock rubber mount, which bolts to the frame X-member with 2 bolts/nuts on each side.
You need the factory stock 62 (ONE YEAR ONLY) rear mount plate-------------------which is available from all the aftermarket Corvette vendors (Corvette Central, Paragon, etc) for about $20.
Because of the difference in the mount pad on 57-61 transmission tail housings and the mount pad on the Muncie tail housing, the transmission cross member needs to be dropped about 1in. I did this using 1in square tubing and longer bolts.
All of this is shown below.
These cars came from the factory with somewhat extreme U-joint angles.
An additional benefit of dropping the rear of the transmission is that it will lessen the severe angle of the U-joints.
Last edited by DZAUTO; 07-17-2018 at 10:54 PM.
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PattiR (07-17-2018)
07-17-2018, 11:27 PM
#4
Racer
Thread Starter
Dennis,
IF YOU HAVE A MUNCIE IN YOUR CAR, here is what you need.
You need the factory stock transmission cross member, with stock rubber mount, which bolts to the frame X-member with 2 bolts/nuts on each side.
You need the factory stock 62 (ONE YEAR ONLY) rear mount plate-------------------which is available from all the aftermarket Corvette vendors (Corvette Central, Paragon, etc) for about $20.
Because of the difference in the mount pad on 57-61 transmission tail housings and the mount pad on the Muncie tail housing, the transmission cross member needs to be dropped about 1in. I did this using 1in square tubing and longer bolts.
All of this is shown below.
These cars came from the factory with somewhat extreme U-joint angles.
An additional benefit of dropping the rear of the transmission is that it will lessen the severe angle of the U-joints.
IF YOU HAVE A MUNCIE IN YOUR CAR, here is what you need.
You need the factory stock transmission cross member, with stock rubber mount, which bolts to the frame X-member with 2 bolts/nuts on each side.
You need the factory stock 62 (ONE YEAR ONLY) rear mount plate-------------------which is available from all the aftermarket Corvette vendors (Corvette Central, Paragon, etc) for about $20.
Because of the difference in the mount pad on 57-61 transmission tail housings and the mount pad on the Muncie tail housing, the transmission cross member needs to be dropped about 1in. I did this using 1in square tubing and longer bolts.
All of this is shown below.
These cars came from the factory with somewhat extreme U-joint angles.
An additional benefit of dropping the rear of the transmission is that it will lessen the severe angle of the U-joints.
Thanks for the info. I was concerned about the drive line angle as well. This mount adjustment seems to fix that problem as well.
Dennis
07-17-2018, 11:31 PM
#5
Racer
Thread Starter
Thanks for the info. Looks like you and DZAUTO were on the same wavelength for my issue. I thought it was going to be too close. So off to the metal shop tomorrow for some square stock and longer bolts!
Dennis
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PattiR (07-18-2018)
07-18-2018, 09:12 AM
#7
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PattiR (07-18-2018)
07-18-2018, 11:18 AM
#8
Racer
Thread Starter
07-19-2018, 03:44 PM
#9
Racer
Thread Starter
trans dropped in place
Thanks for the great solution. I got the nuts for spacers and bolts and hardware for the hookup at 11:00am today and had the job finished by 1:30pm. Thanks also go to DZAUTO for info and DZVETTE for his Muncie wranglin' saddle that he made for me.
Thanks to all.
Dennis