Brand New Transmissions Found!
08-28-2012, 10:43 PM
#106
Rennlist Member
The 85 box will absolutely fit in the 84 car.
Same bowden. Same shift cable. 84 TT will work.
Make sure to arrest the flexplate loading with aux. clamp or Constantine or shim setup.
Being as you will be winding it up with the 2.52.
The 84 axle shafts will bolt right up.
May be a slight harness diff, as I think 85 has trans temp sensor and 84 doesn't
83 SHOULD be same.
Congrats again on this amazing find. So cool.
Same bowden. Same shift cable. 84 TT will work.
Make sure to arrest the flexplate loading with aux. clamp or Constantine or shim setup.
Being as you will be winding it up with the 2.52.
The 84 axle shafts will bolt right up.
May be a slight harness diff, as I think 85 has trans temp sensor and 84 doesn't
83 SHOULD be same.
Congrats again on this amazing find. So cool.
Last edited by Landseer; 08-28-2012 at 11:05 PM.
08-28-2012, 11:10 PM
#107
Administrator - "Tyson"
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IcemanG17 got it.
The "idea" behind doing this and using 5th gear as much as possible was for longevity and reliability as much as ultimate track performance.
When a 928 transmission is in 5th gear you can theoretically remove the complete lay shaft. This should produce less friction and heat versus spending so much time in 4th.
It doesn't really work that way.
If you were to develop such an engine, you would still be spending more time in 4th gear and slipping into 5th for only the longest of straights. Elkhart Lake is really the only track in North America with straights long enough to even attempt such a setup. Even Mark Anderson doesn't come close to speeds that would make a 2:20 feasible.
The long back stretch at the 'Ring, and LeMans with the chicanes removed form the Mulsanne straight would see such speeds. But again, you would still be spending most of the lap in 3rd and 4th which defeats the purpose of trying to design a gearbox that makes the most use of 5th gear.
The "idea" behind doing this and using 5th gear as much as possible was for longevity and reliability as much as ultimate track performance.
When a 928 transmission is in 5th gear you can theoretically remove the complete lay shaft. This should produce less friction and heat versus spending so much time in 4th.
If you were to develop such an engine, you would still be spending more time in 4th gear and slipping into 5th for only the longest of straights. Elkhart Lake is really the only track in North America with straights long enough to even attempt such a setup. Even Mark Anderson doesn't come close to speeds that would make a 2:20 feasible.
The long back stretch at the 'Ring, and LeMans with the chicanes removed form the Mulsanne straight would see such speeds. But again, you would still be spending most of the lap in 3rd and 4th which defeats the purpose of trying to design a gearbox that makes the most use of 5th gear.
08-29-2012, 01:59 AM
#108
08-29-2012, 02:08 AM
#109
Former Vendor
Thread Starter
Seriously, guys.
There's so much information in this thread, way beyond selling a little bit of metal.
So much knowledge, so many experts about so many things....
How great is Rennlist?
There's so much information in this thread, way beyond selling a little bit of metal.
So much knowledge, so many experts about so many things....
How great is Rennlist?
08-29-2012, 12:35 PM
#110
Rennlist Member
Could not, and would not even consider owning my 928 without resources like rennlist.
Wish I could contribute more on the technical side, but for the most part, can only offer the occasional cheering from the sidelines.
And amazing find on the trannys. Wow.
Wish I could contribute more on the technical side, but for the most part, can only offer the occasional cheering from the sidelines.
And amazing find on the trannys. Wow.
08-31-2012, 11:36 PM
#112
Nice!
09-01-2012, 12:28 PM
#113
Former Vendor
09-01-2012, 12:36 PM
#114
Administrator - "Tyson"
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09-06-2012, 08:27 PM
#116
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I visited Greg and saw some of the gearboxes !! Awesome simply awesome reminded me of years ago when I sold a new GTS 5 speed for $7,500 about half of the list price and now that seems like a true bargain.
09-07-2012, 05:38 PM
#119
Former Vendor
Thread Starter
Post #1.................'85/'86 4 speed Automatics with limited slip. Some with "shorter" gear ratios. Would "transform" an early 3 speed car and be significantly "quicker" than USA version transmisions. All have "higher" stall convertors, to allow engine to get into torque range quickly.
Post #46.................'85/'86 5 speed manual, with limited slips. Obviously will fit in anything earlier, with different torque tube and rear suspension carrier. Will also fit in everything later, if someone want to get rid of their PSD and run a "normal" limited slip. Have 2.20 ring and pinions, for higher top speed/less rpms on freeway.
Post #83................'87/'88 4 speed automatics, with limited slips. Will also fit in anything later, if someone wants a "regular limited slip" and wants to get rid of the PSD unit. Have 2.20 "tall" US ring and pinions. Good for people that like higher top speed.
All of the information is still current, with the exception that someone asked if there would be any problem with them sitting for 25 years.
I decided to change the two paper gaskets on the 5 speeds (the viton/rubber seals look brand new. (This allows me to check the ring and pinion, limited slip, and complete gearcluster.)
On the automatics, I'm changing the rear cover gaskets (gives me a chance to inspect the differential/ring and pinion). I'm "updating" the B2 piston to the lastest version, I'm replacing the K1 spring train (to reduce 2nd to 3rd "lag" time, and I'm removing the front pump to inspect the inside and check the front pump o-ring (both I have done this to appeared to have an o-ring/gasket/convertor seal that looked like I put it in yesterday.) I'm making sure the pump and the front convertor bushing are saturated with lubricant, so no one has any problems with starting these up "dry". I'm also "inverting" the transmissions, filling them up completely with transmission fluid and letting then sit like that for 24 hours, while I "rotate" them occasionally. This will ensure that everything is completely saturated with ATF and ensure that nothing is "dry" when first run.
