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Join Date: Mar 2004
Location: Boise, ID
Posts: 332
915 transmission problem

Currently my 915 is a 4sp 1-4 no 5 or R. :-(
Background:
I took the car (83 911SC) for a drive on 9/3.
Exiting the freeway down shifting 5-4-3. I stopped at a redlight
and shifted into 2nd then tried to shift into 1st.
wouldn't go; couldn't move the car tried R no go. Tried moving the car manually
forward and reverse it would not budge. transmission totally locked up.
Called AAA when pulling it on to the deck of the rollback there was a distinct POP
and the rear wheels turned free. Got the car home.
Tried the shifter and it felt like all 6 gears were accesible. Started the engine
and found that 1,2,3,and 4 were there. Accessing 5 and R gave me 3 and 4 again! bummer
Got out the manual checked the u-joint, and went through the linkage adjustment
procedure. No change. What is my next step? I hope one of you guys can give me an idea.
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1981 911sc Targa Rosewood (sold to Rob)
1983 911sc sunroof coupe Guards red
1986 930 (Sold, but not forgotten)

Last edited by Carl_Boehme; 09-13-2017 at 05:20 AM..
Old 09-13-2017, 05:18 AM
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Well, now that you have checked linkages so the next thing to do is to remove the shift access port at the bottom and slightly to the driver side of the gear box to see what shift alignment you have. Maybe you will see that one of the shift forks is out. Do drain the fluid first.

If that does not give you anything positive, then the gear box comes out and the nose section where the 5/R gears live needs to be removed.

This is common with 915 gearboxes now. There must be one or two posts on this gearbox every week. Good luck.
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Old 09-13-2017, 06:28 AM
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Thanks yelcab1; I will get that done this weekend.
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1981 911sc Targa Rosewood (sold to Rob)
1983 911sc sunroof coupe Guards red
1986 930 (Sold, but not forgotten)
Old 09-13-2017, 11:24 AM
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KTL KTL is offline
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Sounds like your trans engaged two gears at once and then it popped free. When it popped free, it messed up the 5th-reverse shift rod.

Yelcab is correct that the shifter operation transfers from the shift rod in the nose of the transmission to the guide fork mounted on that cover plate. That guide fork is what dictates how the shift rods are activated, based on how the actual shifter is moved by the driver. Gordo2 here on the forum did a great job of describing how this shift rod system operates in this video

https://www.youtube.com/watch?v=LLEWjNRjJTI

There's also some spring loaded detents in the 915 case that are supposed to prevent the selection of multiple gears at the same time. Often times people can open up a 915 and mess with it and not pay attention to making sure those detent "pills" are properly positioned So those detents need to be investigated too.

This thread is one that comes to mind that covered a lot of things in detail, basically walking a novice thru a 915 teardown and reassembly

Can't Shift Into First
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Kevin L
'79 911SC widebody conversion
'86 Carrera
Past: '87 Carrera "The Unicorn"
Old 09-13-2017, 11:51 AM
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Thanks Kevin; You guys are great.
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1981 911sc Targa Rosewood (sold to Rob)
1983 911sc sunroof coupe Guards red
1986 930 (Sold, but not forgotten)
Old 09-13-2017, 05:03 PM
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I replaced the transmission coupler with a new one obtained from our host; readjusted the linkage per the manual and I don't get any movement on the rod when I move the shift lever to the 5-R position. I can get R by twisting the coupler towards the DS (clockwise) and pulling the shift lever into R position. Any ideas on what to dig into next?
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1981 911sc Targa Rosewood (sold to Rob)
1983 911sc sunroof coupe Guards red
1986 930 (Sold, but not forgotten)
Old 09-18-2017, 08:52 AM
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KTL KTL is offline
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I think you need to get inside the transmission and see what's going on. Best way to get a peek inside there is to remove that bottom cover. That will allow you to look at the guide fork and see if it's been knocked loose
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'79 911SC widebody conversion
'86 Carrera
Past: '87 Carrera "The Unicorn"
Old 09-21-2017, 10:22 AM
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