5 speed replacement g28 05
#16
Rennlist Member
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Here are my symptoms: Have to hold it in Reverse. Reverse doesn't seem to engage fully.
Pops out of 2nd and 4th when you let off the gas.
1st and 2nd syncros are terrible.
A very noticeable wine in the lower gears.
No self centering of the shifter.
I think that is everything.
Pops out of 2nd and 4th when you let off the gas.
1st and 2nd syncros are terrible.
A very noticeable wine in the lower gears.
No self centering of the shifter.
I think that is everything.
Time for a rebuild. I believe the whine is coming from bearings going bad, either your main or the roller bearings over the main. Also, on the older transmissions, the syncros and dogteeth are ONE unit. Another item that gets over looked is your anchor bands. These items get worn out causing a lot of problems as well. Check out my rebuild thread. It took me 18 months to find all the parts and rebuild. I think I got the last two roller bearings in the US at the time. Some porsche dealer in Maine had them.....
Your best bet is probably to just buy the an 85 from Greg and be done. Save time and money and still enjoy driving the rest of the summer.
#18
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There are some sacrifices that may have to be made. When I tore into my g28-05...the the final gear had 54 teeth... so a 2.54 ratio...
#19
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That would be Vilhuer (Errka). I just searched his threads looking for the one referenced below. I ran down several rabbit holes and learned a lot........ but I cannot find the one referred to.
#20
Nordschleife Master
#21
Race Director
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When Doc rebuilt the transmission in Casper it took TWO cores, plus soft parts to make one transmission...I was lucky that the hard parts were still good.....didn't need gear sets or bearings...only synchros-seals-etc....
I still have two more, plus the good one in the car.... Knowing the limited availability of parts was part of my decision to go with a G28-03 car....since they made lots and about 1/2 were 5 speeds back then...
I still have two more, plus the good one in the car.... Knowing the limited availability of parts was part of my decision to go with a G28-03 car....since they made lots and about 1/2 were 5 speeds back then...
#22
Race Director
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Depending on if your 80 is a G28-03 or G28-05.....if it is the "later" G28-05 than its pretty easy to swap the transaxle....Sean just put the 1989 5 speed from the old widow into his 84....
The early G28-03 cars have different TT, shift rods and rear crossmember...
Another factor is the G28-03 boxes are much lighter than the later ones....my freshly rebuilt G28-03 is 122lbs....vs about 145lbs for the later boxes....I have no idea why....
#23
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#24
Three Wheelin'
Thread Starter
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Glen
Depending on if your 80 is a G28-03 or G28-05.....if it is the "later" G28-05 than its pretty easy to swap the transaxle....Sean just put the 1989 5 speed from the old widow into his 84....
The early G28-03 cars have different TT, shift rods and rear crossmember...
Another factor is the G28-03 boxes are much lighter than the later ones....my freshly rebuilt G28-03 is 122lbs....vs about 145lbs for the later boxes....I have no idea why....
Depending on if your 80 is a G28-03 or G28-05.....if it is the "later" G28-05 than its pretty easy to swap the transaxle....Sean just put the 1989 5 speed from the old widow into his 84....
The early G28-03 cars have different TT, shift rods and rear crossmember...
Another factor is the G28-03 boxes are much lighter than the later ones....my freshly rebuilt G28-03 is 122lbs....vs about 145lbs for the later boxes....I have no idea why....
#25
Race Director
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From what I understand you must run a G28-03 rear cross member with the G28-03 trans since Porsche shifted where the transmission mounts...I would imagine a decent fabricator could make it work....but its not that hard to put in the right crossmember
#26
Former Vendor
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If you want to retain the original box, with the shorter gear ratios, send it out, I can take it apart and see what it actually needs. Although, looking at your "list" of problems.....is a bit disturbing.
#27
Former Vendor
#29
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#30
Former Vendor
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1982 to 1995: 29685 automatic transmissions, worldwide, vs. 13426 5-speeds
About half of the surviving automatics are on the shelf at 928Intl.![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
Worldwide 5-speed production by Transmission type:
G28.05 2773
G28.07 1725
G28.08 1518
G28.10 109
G28.11 1424
G28.12 2045
G28.13 1017
G28.55 2091
G28.57 645
About half of the surviving automatics are on the shelf at 928Intl.
![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
Worldwide 5-speed production by Transmission type:
G28.05 2773
G28.07 1725
G28.08 1518
G28.10 109
G28.11 1424
G28.12 2045
G28.13 1017
G28.55 2091
G28.57 645
SS