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The frame was in very good condition. There was a small rust repair needed on the end of the rear cross member. I had the frame sandblasted and then primed with PPG DP-90. The Black paint was a catalyzed urethane from PPG flattened to about a 50% sheen. |
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The previous owner had the frame and metal parts refinished, but the quality of work was very poor. I decided that a 1961 FI Corvette should have a quality restoration. The paint was a very thick rubbery type paint that need to be removed using a chemical paint stripper. The parts are ready for media blasting and then a coat of PPG DP primer and black top coat with the correct paint sheen. |
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The rear axel housing was correct positraction unit, but the differential was a non-positraction 336:1 unit. I have purchased the correct date coded positraction carrier and will be install a new 3.70:1 positraction gear unit. |
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Note that the large P is very thin and correct for a Corvette application and were casted in Saginaw MI and will have a single digit for the year (0). The thicker P symbol was used on passenger cars and were cast in Tonawanda NY and will have a double digit for the year (60) 1960. |
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There are differences between positraction and non-positraction axel housings. The positraction housings have the vent tube off the left top axel tube and there is a splash or drip baffle in side the housing. The axle lengths are also different. Check the 1961 Sateen silver pictures for the original inspection markings for the differential-axel assembly. |
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The original positraction differential was changed out for an non-positraction unit. I purchased the correct date coded carrier with the thin line "P" symbol. After cleaning I noticed a yellow dab of paint on the inside of the carrier. |
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The splash-drip baffle is only in the Positraction differential axle housing. |
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Technical drawings provided by Joe Mish |
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There are differences between the Posi and Non-Posi flanges, I am not sure how to determine the differences so any help will be appreciated. mailto:ray63@rochester.rr.com |
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Positraction axles are different from the non-positraction axels, Note: Yellow indicates positraction axles. As I receive additional information about the positraction differential and axles, I will update this box. Note the different length of the axles and the yellow paint markings. Yellow was used to designate positraction axles. |
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Note the casting numbers on the gear box and cover plate. These are casting numbers and not part numbers. |
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Original rear leaf springs, Note: Original springs will have a part number and grooves for the spring liners. |
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Part number: |
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All four brake drums have the part number: 3752623. Three of the drums have the casting number as pictured, one has a different font. I need to research the reason for the different fonts. |
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1961 positraction Hyatt 1542WA 865 rear wheal bearing and seal |
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The Federal-Mogul RW-607-NR replacement wheel bearing. The Hyatt 1542WA bearing has been discontinued. |
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Painted parts ready to be installed on the frame. |
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T10-1C Main Case |
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I was having problems removing the steering bearing from the third-arm. I built the puller viewed in the photo provided by Joe Mish. I have to secure longer bolts, but the bearing is almost out; Thanks! Joe |
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Restored chassis is ready for the rebuilt components. All the parts are painted and will be installed over the next few weeks. | |
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Two different lower A-arm nuts; Which one is correct? The view to the left is the type that is on my April 1961 Corvette |