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Old 08-12-2018, 09:49 AM
rgraff rgraff is offline
TT Newbie
Join Date: Jun 2018
Boat: 1984 Stars and Stripes 351W
Location: South
Posts: 1
Velvet Drive

Have an 84 Stars and Stripes with 351W and 10-17 velvet drive. Bought the boat 4 months ago after it had been sitting up for couple years. Tuned it up good, changed points to E/I, new Holly 650 and got it running good. Have run it probably 20 hrs and yesterday lost all propulsion. Pulled everything of from Bell housing back. Damper completely shot, ordered new one. Itís a 1:52/1. With transmission in forward or reverse should I be able to get the same rotation at the tail shaft by turning the input shaft by hand or does that happen at higher RPM? Just thinking may should take it and have checked out while itís out of the boat. This is my first Mastercraft and though Iím very mechanically capable, donít know a lot about these transmissions. Thanks in advance for any feedback.
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Old 08-12-2018, 11:26 AM
1redTA's Avatar
1redTA 1redTA is offline
MC Devotee
Join Date: Aug 2009
Boat: 1981 MasterCraft 351W slot
Location: Pace, FL
Posts: 1,481
Should get 1.52 in forward and what ever ratio reverse is
1981 MasterCraft
19' Skier 351W PowerSlot
Long gone is the Trans AM waiting for another
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Old 08-12-2018, 02:32 PM
88 PS190 88 PS190 is offline
MC Maniac
Join Date: Aug 2005
Boat: 1988 MC Prostar 190, 351 Ford
Location: Midwest
Posts: 4,384
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The transmission engages based on hydraulic pressure, the input side spins at idle 600 rpm pumping hydraulic fluid through a control block. When you shift into forward gear that pressure acts on ths forwards clutch plates and pushes the plates together. This then outputs 1:1 through the transmission. In reverse a separate clutch pack causes a planetary gear set to engage which causes reverse rotation at slower than 1:1 hence the noise and fact that revving in reverse doesn't go very far.

The gear reduction is essentially bolted to the back of a standard transmission as a separate housing hence the length difference.

Point being to test properly you need to generate a few hundred rpm on the input to get the pressure you need. It wont lock up like a manual gearbox and let you turn the shaft
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