Would greatly appreciate a video of disassembly/reassembly in the same detail you did the heads. Of course the all secret high art of ring and pinion depth. Discuss if this be done well w/o factory tools, alternatives? Differentials lsd vs gears, case weak points and how to read surfaces for wear. 915 mag/alum - and G50 01. What is a true “rebuild”? maybe even discuss some of the popular gear ratios QQ...etc? Very much love your quality of production but most importantly your knowledge-base. Happy to support anyway I can. Although, just catching steam these vids are a gem in the community. Thanks so much. You are appreciated, keep it up!
I have never changed between a summer and a winter oil in the transmission. I have two brands of oil that I use, Swepco or Sta-Lube, both oils are a GL-5 spec and are 75W/90 weight. with these oils I have not experienced any shifting issues in either very cold or very hot ambient conditions. Thanks for watching Kurt
@@klassikats Sounds good, thank you! I have just found your channel. Do you have, or can you make a gear shift linkage adjustment video? My second gear is a bit crunchy, but I am not sure if the linkage out of adjustment or the trans needs a rebuild. Thank you!
@@KoenigsTiger957 Yes we can do a video setting up the gear shift. A lot of people struggle with that. Also, the 915 transmission tends to take a beating on the 2nd gear. So if 4th gear feels normal and the shifter is in the right place then it is most likely not an adjustment. Thanks for all the comments... Kurt
Yes that is usually the best option. The main reason being the special tools required. Most of the tools I used in this video I have had for the last 25 years or more and are no longer available. It also doesn't make sense to try and buy them for just one job, unless you are planning on going into the business. Kurt
Hey, as its also about time for me to change I have to ask - are there any transmission fluids you guys recommend for my 915?(Also for us EU folks) I heard of a guy driving a 75W140 GL5 but there are bad stories told about fully synthetic gear oils - what do you think about it? Many stick just with a plain 80w90 GL4/5 from LiquiMoly
So the oil brands that I generally use are Sta-lube or Sweepco. Sta-lube is my go to oil for the 915,901,911, and 930 transmissions. I have been using it for the last 30 years and have had really good results with it. LiquiMoly is a good brand and I have used there engine oils in the past with no issues. Really what it comes down to is using a good name brand oil that meets the 80W90 GL5 specifications. When it comes to synthetic oils I have not really tried them to see the affect in the transaxle. Generally the 915 was designed use mineral oils which is what i stick with. Kurt
Hoi , very good and understadebel explination. I have a rebuild 915 from 1975 2,7 gearbox and its wining like hell, it was rebuild in 2003 and at that moment i driven with it 800km. In that time i went to the shop who rebuild it and he say to me that the wining go away with driving, after the 800km driving ,i stopped driving with it becouse i think its goiing to blow up. I have to say that in that time the man who do the rebuild work alone and gets allot of telefoon so its interrupted his work all the time. Easey for make mistakes. There are all new bearings in the 915 , not the needle bearings. I assume someting must be loose inside . I have a small video with 1 wheel off the ground and let the gearbox spin the wheel in some gears. The other wheel is on the ground. I have also a 1984 3,2 where i did the same for see the difference off wining. I am on holiday until end off jan but the video clips from the wining i have here on my laptop. I will try to post it here. The box with all the parts replaced i still have in my home. About a year ago i went to a oldschool mecanic and let him drive the porsche 911 2,7 with the wining gearbox. His first impression was that it sounds like the gearbox makes sound like it have straight teeth in the gearbox. Have to say that the man who rebuild the gearbox is a proffessional rebuilder for porsche and VW engines and other heads work to. He is on pension now but he not helped me in that time. whent to see him back in that time few times with that problem and the last time him said to me that the needle bearings also have to make new and it will cost me again the same like i paid him before> I find this unbelivebel,if i see your videos when you take it all appart and you inspect every part than i assuming that he did the same normaly. Before i gave him the ok for rebuild him told me that the gearbox will be as new when he finis the job.
So a few questions for you; Did the transmission whine before being rebuilt? Does the transmission whine in all gears at any speed? Does the whining sound change with speed? (become higher pitched the faster you go) lastly does the whine go away when you let off the gas pedal or does it stay the same? So bearings when they fail usually will not whine, instead they tend to make a growling sound that gets louder as road speed increases. Bearing noises will also change with load depending on the bearing that is failing. Most whining sounds come from gear mesh issues usually with the ring and pinion. If the ring and pinion have been incorrectly set up then they will be noisey. If the ring and pinion have been used for some length of time with an incorrect setting it can often cause them to become noisey. Even resetting the gear sets to the correct specifications often will not quieten the gears due to an incorrect wear pattern. Just so you know whines in a transmission never get better by themself. The shift quality will improve in a 915 as you drive the car but there should be no unusual noise coming from the transaxle. Seeing the wear on a ring and pinion can be really tough sometimes. It is something I would have to hear to diagnose the issue. Not sure a video would work but if you want send me a link to our email contact@klassikats.com I will see what it sounds like. Kurt
@@klassikats Thanks for reply Kurt. Its 20 year ago that i bay the car. I am not sure anymore but i think the gearbox was wining when i bay the car . I am on holiday until end off januari and will make some small video s from what i here in the car when driving and will test and record for the acceleration and the other things you write above. 3 small video s i will sent to your mail with the car running with 1 wheel off the ground and i go true some gears. When i push in the clutch and the wheel comes to stop while the engine is running than there is no more noises. When i am back home i wil send the video s while i am driving the car so can here alot more off what noises it produce.Grtz geert
Jesse, We are in Flagstaff AZ, and pricing can really vary depending on the internal condition of your transmission. To give you an idea costs start around $1900 and can easily go to $6000 depending on condition of parts once the cases are split. Thanks Kurt
Very educational! I like the segment about driving behavior, I don't think I'll be driving with my hand on the shifter anymore!
Nice, Glad it was helpful for you and your gearbox will thank you in the long run.
Everything is done here, identical to the old days, but with modern technics it's a very good job, you are a reference for the world now :)
Thanks for watching
Kurt
That was awesome. Enjoyed the tunes along with the visuals.
Glad you enjoyed it
Thanks for watching
Awesome video, was captured all the way through
Glad you enjoyed it
Kurt
Thanks for showing the rebuild of the transmission. By watching helps me understand what the manual doesn't cover.
Glad to help. We will be making more in-depth lessons on the 915 to cover all the set up measurements and such.
Thanks for watching
@@klassikats awesome... I'll be watching!!!
Would greatly appreciate a video of disassembly/reassembly in the same detail you did the heads. Of course the all secret high art of ring and pinion depth. Discuss if this be done well w/o factory tools, alternatives? Differentials lsd vs gears, case weak points and how to read surfaces for wear. 915 mag/alum - and G50 01. What is a true “rebuild”? maybe even discuss some of the popular gear ratios QQ...etc?
Very much love your quality of production but most importantly your knowledge-base. Happy to support anyway I can. Although, just catching steam these vids are a gem in the community. Thanks so much. You are appreciated, keep it up!
Working on the transmission detail videos. Factory tools are a must for some jobs, no way around it. Thank you for the support. S
@@klassikats can hardly wait but will do so patiently, as quality and respect for your craftsmanship are worth every second.
Amazing to watch, my car uses G64 C4 ... Hope i am many miles from this exercise ... 🥳
I hope so too!
Thanks for watching
Thank you for the great video! What gear oil do you recommend for summer only for the 915? Thank you :)
I have never changed between a summer and a winter oil in the transmission. I have two brands of oil that I use, Swepco or Sta-Lube, both oils are a GL-5 spec and are 75W/90 weight. with these oils I have not experienced any shifting issues in either very cold or very hot ambient conditions.
Thanks for watching
Kurt
@@klassikats Sounds good, thank you! I have just found your channel. Do you have, or can you make a gear shift linkage adjustment video? My second gear is a bit crunchy, but I am not sure if the linkage out of adjustment or the trans needs a rebuild. Thank you!
@@KoenigsTiger957 Yes we can do a video setting up the gear shift. A lot of people struggle with that. Also, the 915 transmission tends to take a beating on the 2nd gear. So if 4th gear feels normal and the shifter is in the right place then it is most likely not an adjustment. Thanks for all the comments...
Kurt
The Transmission looks to me like the most complex system to rebuild. Would you say it’s best to just outsource it to a reputable service provider?
Yes that is usually the best option. The main reason being the special tools required. Most of the tools I used in this video I have had for the last 25 years or more and are no longer available. It also doesn't make sense to try and buy them for just one job, unless you are planning on going into the business.
Kurt
Hey, as its also about time for me to change I have to ask - are there any transmission fluids you guys recommend for my 915?(Also for us EU folks) I heard of a guy driving a 75W140 GL5 but there are bad stories told about fully synthetic gear oils - what do you think about it? Many stick just with a plain 80w90 GL4/5 from LiquiMoly
So the oil brands that I generally use are Sta-lube or Sweepco. Sta-lube is my go to oil for the 915,901,911, and 930 transmissions. I have been using it for the last 30 years and have had really good results with it. LiquiMoly is a good brand and I have used there engine oils in the past with no issues. Really what it comes down to is using a good name brand oil that meets the 80W90 GL5 specifications. When it comes to synthetic oils I have not really tried them to see the affect in the transaxle. Generally the 915 was designed use mineral oils which is what i stick with.
Kurt
Hoi , very good and understadebel explination. I have a rebuild 915 from 1975 2,7 gearbox and its wining like hell, it was rebuild in 2003 and at that moment i driven with it 800km. In that time i went to the shop who rebuild it and he say to me that the wining go away with driving, after the 800km driving ,i stopped driving with it becouse i think its goiing to blow up. I have to say that in that time the man who do the rebuild work alone and gets allot of telefoon so its interrupted his work all the time. Easey for make mistakes. There are all new bearings in the 915 , not the needle bearings. I assume someting must be loose inside . I have a small video with 1 wheel off the ground and let the gearbox spin the wheel in some gears. The other wheel is on the ground. I have also a 1984 3,2 where i did the same for see the difference off wining. I am on holiday until end off jan but the video clips from the wining i have here on my laptop. I will try to post it here. The box with all the parts replaced i still have in my home. About a year ago i went to a oldschool mecanic and let him drive the porsche 911 2,7 with the wining gearbox. His first impression was that it sounds like the gearbox makes sound like it have straight teeth in the gearbox. Have to say that the man who rebuild the gearbox is a proffessional rebuilder for porsche and VW engines and other heads work to. He is on pension now but he not helped me in that time. whent to see him back in that time few times with that problem and the last time him said to me that the needle bearings also have to make new and it will cost me again the same like i paid him before> I find this unbelivebel,if i see your videos when you take it all appart and you inspect every part than i assuming that he did the same normaly. Before i gave him the ok for rebuild him told me that the gearbox will be as new when he finis the job.
So a few questions for you;
Did the transmission whine before being rebuilt?
Does the transmission whine in all gears at any speed?
Does the whining sound change with speed? (become higher pitched the faster you go)
lastly does the whine go away when you let off the gas pedal or does it stay the same?
So bearings when they fail usually will not whine, instead they tend to make a growling sound that gets louder as road speed increases. Bearing noises will also change with load depending on the bearing that is failing.
Most whining sounds come from gear mesh issues usually with the ring and pinion. If the ring and pinion have been incorrectly set up then they will be noisey. If the ring and pinion have been used for some length of time with an incorrect setting it can often cause them to become noisey. Even resetting the gear sets to the correct specifications often will not quieten the gears due to an incorrect wear pattern. Just so you know whines in a transmission never get better by themself. The shift quality will improve in a 915 as you drive the car but there should be no unusual noise coming from the transaxle.
Seeing the wear on a ring and pinion can be really tough sometimes. It is something I would have to hear to diagnose the issue. Not sure a video would work but if you want send me a link to our email contact@klassikats.com I will see what it sounds like.
Kurt
@@klassikats Thanks for reply Kurt. Its 20 year ago that i bay the car. I am not sure anymore but i think the gearbox was wining when i bay the car . I am on holiday until end off januari and will make some small video s from what i here in the car when driving and will test and record for the acceleration and the other things you write above. 3 small video s i will sent to your mail with the car running with 1 wheel off the ground and i go true some gears. When i push in the clutch and the wheel comes to stop while the engine is running than there is no more noises. When i am back home i wil send the video s while i am driving the car so can here alot more off what noises it produce.Grtz geert
Where you guys located and the cost for rebuilding 915 trans?
Jesse,
We are in Flagstaff AZ, and pricing can really vary depending on the internal condition of your transmission. To give you an idea costs start around $1900 and can easily go to $6000 depending on condition of parts once the cases are split.
Thanks
Kurt