Ss700





And, why not comparable to gear oil? Viscosity?
In a transmission, additives are important
Bill
When some tried replacing Dexron with standard Hy-Gard, there was sometimes an issue with it flowing through the filter properly, especially when cold. It also lowered the stall of the torque converter by ~100 rpm.
As far as the gear oil. Considering the difference in viscosity, it would seem that if one worked well, the other couldn’t. For instance, running gear oil in an auto requiring Dexron would not likely work very well. And I wouldn’t expect Dexron to work well in a rear end either. While viscosity isn’t the only thing to consider, it is an important factor.





my understanding of the reason ATF came to be used in manual transmission is simple: fuel economy
Bill
So I gave it a try, and my gearbox has never been shifting better. That being said, remains to be seen how it goes in spring and summer temperatures.
Not sure this adds value to this thread, but cause it's an unusual 'fix' I just wanted to mention it





So I gave it a try, and my gearbox has never been shifting better. That being said, remains to be seen how it goes in spring and summer temperatures.
Not sure this adds value to this thread, but cause it's an unusual 'fix' I just wanted to mention it
one thing to consider that I didn't think of is that the SS700 doesn't use conventional brass synchro rings, they are Kevlar or some similar material
this is a quote from a Camaro forum by Jodys Transmissions
http://www.camaros.net/forums/27-tra...num-fluid.html
JodysTransmissions
Gold Lifetime Member
Jody
Join Date: Aug 2005
Location: Reading, PA
Posts: 1,246
Re: new T56 magnum fluid
Quote:
Originally Posted by workng247 View Post
Whats the best fluid for my new T56 magnum and how much (capacity)?
Sticker on trans says DEXIII only.
A search yielded lots of recommendations. Anything from Syncromesh to Amsoil to Mobile1 ATF.
I'm not normally a fan of overpriced fluids (I use Supertech in just about everything) but am open to suggestions on this one.
Thanks
I use to think the same thing about specialty fluids until I witnessed Lubrication Engineers Monolec 1150 topped off in the Legend700 on the spin tester.
The Monolec 1150 had the Legend700 running almost 35 degrees cooler at the tail extension bushing during performance spin testing. That is a huge statement when compared to the other mentioned fluids.
Legend Gear & Transmission was so impressed by the reduced temperature reading that all 2015 Legend700 units receive 4 quarts of the Monolec 1150 per shipment.
kinda difficult to toss expensive lube just to try something else..

Bill
The Legend GT700 basically is a 5 speed version of a T56. Look at how much wider a T56 is.
Sometimes people try to make cases narrow, eliminate fins and do things that affect oil control and cooling in a negative manor. The fins and ribs on T56 T45 TKO and even the T5 create more surface area to dissipate heat just like fins on your car's radiator. Air circulates under the car passes thru the fins and cools it. Also OEM cases are thinner and are DieCast as opposed to thicker sand cast designs. So although the Legend box looks awesome aesthetically and solves clearance issues, its poorly designed to control oil internally and dissipate heat correctly.
Maindrive scuffing happens because as you drive forward, inertia pulls the oil towards the back of the case. Less oil stays in place to properly cool and lube the gears in the very front. If oil can't return fast enough and cool properly you end up with scuffed, heat checked and oil starved gears.
Ford Motorsport for example sells an air scoop for the newer Mustang transmissions because they overheat at high speeds.
I've used Royal Purple Synchromax successfully for endurace transmission applications for T56 and T5 equipped cars.





The Legend GT700 basically is a 5 speed version of a T56. Look at how much wider a T56 is.
Sometimes people try to make cases narrow, eliminate fins and do things that affect oil control and cooling in a negative manor. The fins and ribs on T56 T45 TKO and even the T5 create more surface area to dissipate heat just like fins on your car's radiator. Air circulates under the car passes thru the fins and cools it. Also OEM cases are thinner and are DieCast as opposed to thicker sand cast designs. So although the Legend box looks awesome aesthetically and solves clearance issues, its poorly designed to control oil internally and dissipate heat correctly.
Maindrive scuffing happens because as you drive forward, inertia pulls the oil towards the back of the case. Less oil stays in place to properly cool and lube the gears in the very front. If oil can't return fast enough and cool properly you end up with scuffed, heat checked and oil starved gears.
Ford Motorsport for example sells an air scoop for the newer Mustang transmissions because they overheat at high speeds.
I've used Royal Purple Synchromax successfully for endurace transmission applications for T56 and T5 equipped cars.
Bill
The Legend GT700 basically is a 5 speed version of a T56. Look at how much wider a T56 is.
Sometimes people try to make cases narrow, eliminate fins and do things that affect oil control and cooling in a negative manor. The fins and ribs on T56 T45 TKO and even the T5 create more surface area to dissipate heat just like fins on your car's radiator. Air circulates under the car passes thru the fins and cools it. Also OEM cases are thinner and are DieCast as opposed to thicker sand cast designs. So although the Legend box looks awesome aesthetically and solves clearance issues, its poorly designed to control oil internally and dissipate heat correctly.
Maindrive scuffing happens because as you drive forward, inertia pulls the oil towards the back of the case. Less oil stays in place to properly cool and lube the gears in the very front. If oil can't return fast enough and cool properly you end up with scuffed, heat checked and oil starved gears.
Ford Motorsport for example sells an air scoop for the newer Mustang transmissions because they overheat at high speeds.
I've used Royal Purple Synchromax successfully for endurace transmission applications for T56 and T5 equipped cars.
I witnessed the overheating in the Legend test car during development and the air scoop had to be added to get the trans temp down. Regarding the oil control, I remember there being a lot of time spent on analyzing internal components after running the trans on the spin machine 24/7 for a week. A pneumatic mechanism was used to shift through all forward gear positions as well. The only oiling issue I recall was related to the slip yoke bushing which was corrected. I understand this isn't real world use, just sharing a recollection.
I also remember the oil capacity being adjusted down from the original recommendation. I do not recall what the original capacity specs were but the final recommendation was between 3 qts-3 oz to 3 qts-6 oz. If the trans was filled in the traditional manner (bottom of the fill hole) it would be overfilled.
Things are very tightly packed inside the case for sure and I have attached some photos of an engineering sample that was used to verify shift component interaction. I apologize for the photo quality, this is up in our "attic."
Jeff Kauffman
VP Sales and Marketing
Silver Sport Transmissions
2250 Stock Creek Blvd.
Rockford TN 37853
jeff.kauffman@shiftsst.com
Authorized TREMEC Elite Distributor
The Best of Corvette for Corvette Enthusiasts





I witnessed the overheating in the Legend test car during development and the air scoop had to be added to get the trans temp down. Regarding the oil control, I remember there being a lot of time spent on analyzing internal components after running the trans on the spin machine 24/7 for a week. A pneumatic mechanism was used to shift through all forward gear positions as well. The only oiling issue I recall was related to the slip yoke bushing which was corrected. I understand this isn't real world use, just sharing a recollection.
I also remember the oil capacity being adjusted down from the original recommendation. I do not recall what the original capacity specs were but the final recommendation was between 3 qts-3 oz to 3 qts-6 oz. If the trans was filled in the traditional manner (bottom of the fill hole) it would be overfilled.
Things are very tightly packed inside the case for sure and I have attached some photos of an engineering sample that was used to verify shift component interaction. I apologize for the photo quality, this is up in our "attic."
never heard about the overfill specifically; kinda tough to not 'overfill';. what is the danger in overfilling other than leaks?
as to Jodys comments; is 'ATF' the right/best/correct lube?
Bill
I witnessed the overheating in the Legend test car during development and the air scoop had to be added to get the trans temp down. Regarding the oil control, I remember there being a lot of time spent on analyzing internal components after running the trans on the spin machine 24/7 for a week. A pneumatic mechanism was used to shift through all forward gear positions as well. The only oiling issue I recall was related to the slip yoke bushing which was corrected. I understand this isn't real world use, just sharing a recollection.
I also remember the oil capacity being adjusted down from the original recommendation. I do not recall what the original capacity specs were but the final recommendation was between 3 qts-3 oz to 3 qts-6 oz. If the trans was filled in the traditional manner (bottom of the fill hole) it would be overfilled.
Things are very tightly packed inside the case for sure and I have attached some photos of an engineering sample that was used to verify shift component interaction. I apologize for the photo quality, this is up in our "attic."
I can verify that there is indeed a condition affecting the T45 (RS600) and so, likely the SS transmissions as well. The condition is oil starvation to the input gear. I opened mine to fix a cracked fork and found the input gear blued. I would attribute this to oil sloshing rearward under acceleration. I overfill mine now and use Amsoil:
https://www.amsoil.com/shop/by-produ...n-fluid-5w-30/
I can't say whether or not the condition persists.
See an earlier post of mine in this thread.
Joe
The last oil we carried for the LGT trans was the Monolec based solely on their recommendation.
I can verify that there is indeed a condition affecting the T45 (RS600) and so, likely the SS transmissions as well. The condition is oil starvation to the input gear. I opened mine to fix a cracked fork and found the input gear blued. I would attribute this to oil sloshing rearward under acceleration. I overfill mine now and use Amsoil:
https://www.amsoil.com/shop/by-produ...n-fluid-5w-30/
I can't say whether or not the condition persists.
See an earlier post of mine in this thread.
Joe
The RS600 was available in a Gen 1 and a Gen 2 so to speak.
Gen 1 had the OE 3.37 first gear cut off the input shaft and the new 2.xx gear EB welded on. This might explain the bluing you saw.
Gen 2 used an entirely new input shaft and I may still have some of these. We have a small stash of T45/RS parts still and I would like for them to find a new home.
The RS600 was available in a Gen 1 and a Gen 2 so to speak.
Gen 1 had the OE 3.37 first gear cut off the input shaft and the new 2.xx gear EB welded on. This might explain the bluing you saw.
Gen 2 used an entirely new input shaft and I may still have some of these. We have a small stash of T45/RS parts still and I would like for them to find a new home.
RS Close Ratio & Standard Ratio Gearsets
Standard Ratio Gearset - 3.37, 1.99, 1.34, 1.0, .67 (1.38 step change in 1st, 33% RPM drop in overdrive)
RS400 (400 torque): 1-1/16 x 10 spline input shaft, SAE 8620 nickel-moly steel alloy
RS500 (500 torque): 1-1/8 x 26 spline input shaft, SAE 9310 chrome-nickel-moly high strength steel alloy, CNC ground gears
Close Ratio Gearset (new)- 2.80, 1.99, 1.34, 1.0, .67 (.81 step change in 1st, 33% drop in overdrive)
RS600 (600 torque): 1-1/8 x 26 spline input shaft, SAE 9310 chrome-nickel-moly high strength steel alloy, CNC ground gears
Mine is "second generation" (RS600)
Please email what you have.
Thanks
Joe





The last oil we carried for the LGT trans was the Monolec based solely on their recommendation.
Bill
Here's a link to that video:
I've had no issues with this transmission using Mobil 1 ATF since draining the Dextron VI at the first 1,000 miles.
Jim
In God We Trust!





there is some theoretical logic to this, especially if you look at the pictures of the cutaway transmission. It appears as if the fill plug is possibly mid shaft...
any thoughts/facts?
Bill
I want to add a bit to the discussion here from Germany. I was like Bill one of the last ones who received the SS700 from Keisler. I believe my gear box has production number 385 or so.
Noise related it works ok after a couple of thousands miles. But it still has mechanical noises. However, when the gear box becomes hot I sometimes have problems to shift into 4th gear from third. I have to pull the shift stick quite hard to get it into the right position. And it then feels spongy. This happens perhaps in one of 30 times. But it is annoying, because you never know for sure if you hit the gear correctly.
I tried heavier oil for manual gear boxes, but this made the problem even worse. Now I am back to synthetic ATF oil from Mobil. I also probably overfilled it, but I can’t imagine that this shifting issue improves with less oil.
Tobias





I want to add a bit to the discussion here from Germany. I was like Bill one of the last ones who received the SS700 from Keisler. I believe my gear box has production number 385 or so.
Noise related it works ok after a couple of thousands miles. But it still has mechanical noises. However, when the gear box becomes hot I sometimes have problems to shift into 4th gear from third. I have to pull the shift stick quite hard to get it into the right position. And it then feels spongy. This happens perhaps in one of 30 times. But it is annoying, because you never know for sure if you hit the gear correctly.
I tried heavier oil for manual gear boxes, but this made the problem even worse. Now I am back to synthetic ATF oil from Mobil. I also probably overfilled it, but I can’t imagine that this shifting issue improves with less oil.
Tobias
Thank you for sharing. I wonder if whatever we are experiencing is simply limited to the 'later' transmissions as there seems to be no 'complaints' from anyone else... Granted, not all were installed in corvettes, so we don't know if anyone else is having problems. OR, maybe we are the anomoly
My problems are 2/3 related, yours is 4th (and I presume no other gears). Interesting
It is such a PIA to r&r the transmission, so unless something gets worse I will try to live with it. There seems to be no answers or magic potions...
If I did remove it I probably would go back to the MY6; I really don't need a 5th gear.....just an OD
Bill










