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175K911's Avatar
 
Join Date: Sep 2007
Location: Wheaton, IL (Chicago 'burbs)
Posts: 3,028
Odd 915 problem- hard to downshift into 3rd

When I took my '86 apart in 2011 the 915 trans had maybe 10 hours on a full rebuild- bearings, synchros, sliders etc. Everything worked beautifully. Gearbox has sat strapped on my bench ever since, never dropped or shifter shaft damaged. But when I took the car for the very first drive in 8 years today, it's a challenge to downshift into 3rd. Feels like there's a detent holding it back then it'll go in with a clunk you can hear and feel. Upshifts 2nd to 3rd perfectly. All other gears work fine.

Changes made since I'd taken it apart:
Built up a 3.6
Aluminum Patrick conversion flywheel
Still has the original aluminum pressure plate, new clutch disc.
Rebel Racing engine and trans mounts- the ones with poly bushings not solid
Stock factory short shift gone, replaced with Gretener raised tunnel and early JWest shifter
Still run Swepco 201

All the gates are adjusted properly, all other up and downshifts work fine. In fact the 2-3 upshift is like butter. I really don't want to tear the gearbox apart, it took me 8 years to build this car and it's finally running.

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Ed
'86 911 Coupe (endless 3.6 transplant finally done!)
'14 Jeep Grand Cherokee 3.0 Turbodiesel (yes they make one)
'97 BMW 528i (the sensible car, bought new)
'12 Vintage/Millenium 23' v-nose enclosed trailer
Old 04-21-2019, 03:48 PM
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If I were you i I would firts check shifter coupler bushings, if the problem persisti i would replace trans oil and also check for metal particles.
I'm quite sure your shifter coupler is out of order.
Old 04-22-2019, 02:49 AM
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did you make sure this piece(block)number 4 did not slide out of its position??Did it shift fine before installing it into the car?

Ivan
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1985 911 with original 494 441 miles..s..795 726 km
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Old 04-22-2019, 03:32 AM
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gearhead
 
Join Date: Nov 2007
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Were the dog teeth replaced?
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1974 911 Restorod
1974 914 Bumble Bee
1975 911S Tom's Targa
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Old 04-22-2019, 03:45 AM
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Quote:
Originally Posted by Matt Monson View Post
Were the dog teeth replaced?
Yes they were. At the time of the rebuild I installed a Wevo pump driven spray bar plus 20:32 second and 28:24 fifth with all new components on those too. So everything was new from 2nd thru 5th. Worked perfectly when I took it out of the car in 2011. Upshifts to 3rd beautifully.
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Ed
'86 911 Coupe (endless 3.6 transplant finally done!)
'14 Jeep Grand Cherokee 3.0 Turbodiesel (yes they make one)
'97 BMW 528i (the sensible car, bought new)
'12 Vintage/Millenium 23' v-nose enclosed trailer
Old 04-22-2019, 04:52 AM
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Quote:
Originally Posted by fizeus View Post
If I were you i I would firts check shifter coupler bushings, if the problem persisti i would replace trans oil and also check for metal particles.
I'm quite sure your shifter coupler is out of order.
New brass shift coupler bushings installed when I put the engine and trans in the car.
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Ed
'86 911 Coupe (endless 3.6 transplant finally done!)
'14 Jeep Grand Cherokee 3.0 Turbodiesel (yes they make one)
'97 BMW 528i (the sensible car, bought new)
'12 Vintage/Millenium 23' v-nose enclosed trailer
Old 04-22-2019, 04:54 AM
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gearhead
 
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Did you measure it loaded with a synchro? Until a couple years ago all replacement teeth available did not have the proper backcut on them to account for the curvature of the synchro ring. In the upshift the synchro does very little work. It’s the downshift where it earns its keep.

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1974 911 Restorod
1974 914 Bumble Bee
1975 911S Tom's Targa
2008 Cayman S Mule
Old 04-22-2019, 05:18 AM
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