Spec-R Gear diff review
06-21-2010, 09:24 AM
#136
I've had no problems whatsoever with a leaking diff. I put some grease on the silicone o ring. You have to make sure you seat it properly and you shouldn't have any problems. I also used a thin layer of black rtv type sealant around the paper gasket and it hasn't leaked a drop. This spec r gear diff is so buttery smooth. I love the mod.
06-21-2010, 10:48 AM
#137
I've had no problems whatsoever with a leaking diff. I put some grease on the silicone o ring. You have to make sure you seat it properly and you shouldn't have any problems. I also used a thin layer of black rtv type sealant around the paper gasket and it hasn't leaked a drop. This spec r gear diff is so buttery smooth. I love the mod.
06-21-2010, 04:00 PM
#139
06-23-2010, 12:43 PM
#143
Anybody try this thing up front ? With some thick oil/grease you could come close to a spool. Thanks.
Last edited by jag88; 06-23-2010 at 01:20 PM.
06-26-2010, 03:25 AM
#144
Tech Regular
At first I used 900cst oil and now I use 3000cst oil. No difference in handling!
So the gear diff itself runs very good, very consistent and great handling. But after a few runs the gears feel terrible. They grind up to each other and it is very hard to spin the diff. Almost feels like a spool. Freshly build no problems, but after a few runs it is done with the smoothness.
That's why I changed to 3000cst, in this way the pressure on the gears will be reduced a little bit.
I opened the diff a few times and saw the shims were bend like earlier been mentioned. So I replaced them, but still no good. So carefully inspected the gears, but they all look fine (this is later on in the process, because I already stripped 2 sets of gears).
So I don't know what to do right now. I have thought about other options, like changing the shims for thicker ones, but every solution has its down side.
The only thing I can come up with is to mod the inside of the housing like P.I.M.P. stated, in order to put a larger and thicker shim in it. But that will be some serious modification.
I have also tried a double gasket as well, different kind of sanding techniques (even no sanding of the gears), but all that doesn't seem to help much.
So averall my conclusion is, that it isn't really suitable for modified. Bummer.
built to kit with muchmore 800cst oil. Not sure what the problem is
06-26-2010, 07:51 PM
#147
I have tried it in mod, but I have to say overall I'm quite disappointed. I already changed gears two times, because they were stripped.
At first I used 900cst oil and now I use 3000cst oil. No difference in handling!
So the gear diff itself runs very good, very consistent and great handling. But after a few runs the gears feel terrible. They grind up to each other and it is very hard to spin the diff. Almost feels like a spool. Freshly build no problems, but after a few runs it is done with the smoothness.
That's why I changed to 3000cst, in this way the pressure on the gears will be reduced a little bit.
I opened the diff a few times and saw the shims were bend like earlier been mentioned. So I replaced them, but still no good. So carefully inspected the gears, but they all look fine (this is later on in the process, because I already stripped 2 sets of gears).
So I don't know what to do right now. I have thought about other options, like changing the shims for thicker ones, but every solution has its down side.
The only thing I can come up with is to mod the inside of the housing like P.I.M.P. stated, in order to put a larger and thicker shim in it. But that will be some serious modification.
I have also tried a double gasket as well, different kind of sanding techniques (even no sanding of the gears), but all that doesn't seem to help much.
So averall my conclusion is, that it isn't really suitable for modified. Bummer.
At first I used 900cst oil and now I use 3000cst oil. No difference in handling!
So the gear diff itself runs very good, very consistent and great handling. But after a few runs the gears feel terrible. They grind up to each other and it is very hard to spin the diff. Almost feels like a spool. Freshly build no problems, but after a few runs it is done with the smoothness.
That's why I changed to 3000cst, in this way the pressure on the gears will be reduced a little bit.
I opened the diff a few times and saw the shims were bend like earlier been mentioned. So I replaced them, but still no good. So carefully inspected the gears, but they all look fine (this is later on in the process, because I already stripped 2 sets of gears).
So I don't know what to do right now. I have thought about other options, like changing the shims for thicker ones, but every solution has its down side.
The only thing I can come up with is to mod the inside of the housing like P.I.M.P. stated, in order to put a larger and thicker shim in it. But that will be some serious modification.
I have also tried a double gasket as well, different kind of sanding techniques (even no sanding of the gears), but all that doesn't seem to help much.
So averall my conclusion is, that it isn't really suitable for modified. Bummer.
06-28-2010, 10:48 AM
#148
ran mine in mod 4.5 all race day, built stock, xray T3
the only thing I did was add the foam that goes above bladders in shocks in the outdrive behind the cvd, like you would do to keep dogbones in. my thought was this would keep the outdrives together so the wont pull the shim out and stip the gear
worked great, serious forward bite
the only thing I did was add the foam that goes above bladders in shocks in the outdrive behind the cvd, like you would do to keep dogbones in. my thought was this would keep the outdrives together so the wont pull the shim out and stip the gear
worked great, serious forward bite
06-28-2010, 12:34 PM
#149
I raced mine on carpet for the first time yesterday. One thing I will say is that carpet may require heavier oils, as the car would get the inside rear light on tight off power corners due to the higher weight transfer. Once the inside rear gets light, the diff unloads if you run too light an oil, which causes massive oversteer. I did try more droop, but I think heavier oil is better. I was running 150 wt shock oil, which is admittedly thin.
06-28-2010, 05:40 PM
#150
ran mine in mod 4.5 all race day, built stock, xray T3
the only thing I did was add the foam that goes above bladders in shocks in the outdrive behind the cvd, like you would do to keep dogbones in. my thought was this would keep the outdrives together so the wont pull the shim out and stip the gear
worked great, serious forward bite
the only thing I did was add the foam that goes above bladders in shocks in the outdrive behind the cvd, like you would do to keep dogbones in. my thought was this would keep the outdrives together so the wont pull the shim out and stip the gear
worked great, serious forward bite
