Too old in my opinion, a tranny from 1990 will cause problems if it´s not in perfect condition.

 

Just like my R200 from 1991?

Seriously though, they can always be rebuilt. I don't think age is the least concern when it comes to adapting one...

 

I´ve seen a lot of broken Nissan differential because of age and wear, don´t want to spend even more cash to rebuild it when it´s finally in place.
But just my personal opinion and the reason why I don´t like old parts in new cars. I´m looking for a solution as we speak, BMW got solid parts but hard to find our gearing.

 

You can do what you want, but I wouldn't hold out on your tranny lasting. In regards to you saying you get good traction, but then say your tires skim in 4th and 5th, isn't that by definition not having traction? If you're not getting traction, ie, your tires are spinning faster than what they should be for the road speed, then aren't you not accelerating as quickly, and as such, not putting as much strain on your drivetrain? I'd be curious to see what happens when your tires bite in those gears and what that does to your drivetrain. Or maybe your car's transmission was built much stronger than most and you won't post a "crap my tranny broke" thread like the countless others on this forums have over the past years. I don't think its wise to give people the false sense of security that their transmissions will last at these levels power as everyone of them has far exceeded their design specifications.


I'm currently making 741 whp and 471 wtq and we made about 15 pulls on the dynojet anywhere from 650 whp to 741 whp and didnt have one problem. I have also made about 20 or so pulls on the street at 741 whp with no problems and I get great traction with my DR's. Besides the rear skimming down the expressway in 4th and fifth gear at 120+ mph, which can make your butthole pucker pretty good.

I spoke to Jon at TRE a while back and he did some computer calculations on the S's trans at 500 wtq for me. He told me that if I had a fairly low mileage "virgin" (no boost) trans and used either Redline MT-90 or Neo 75w90 RHD to help the shock on the gears, I should be able to get at least 80 hrs at near 500 wtq in 3rd gear and above (2nd is the weakest). Thats 80 hrs of beating on it at full tq load, not just putting around town and thats pretty darn good. Just putting around normally, the trans will last just as any other stock trans with the stock motor would.

Also, you wont be able to put anymore down than about 480-500 whp in second gear even with good hot DR's and dont even try to do anything with first gear. So, limit first and second gears to around 480 whp and then at the top of second and coming into third gear, start bringing in the boost to make the big power and the trans should hold for a while if you also follow what Jon from TRE stated on the gear oil.
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I agree. The only way the trans will hold at those insanely high power levels is if you don't drive the car.

I'm currently making 741 whp and 471 wtq and we made about 15 pulls on the dynojet anywhere from 650 whp to 741 whp and didnt have one problem. I have also made about 20 or so pulls on the street at 741 whp with no problems and I get great traction with my DR's. Besides the rear skimming down the expressway in 4th and fifth gear at 120+ mph, which can make your butthole pucker pretty good.

I spoke to Jon at TRE a while back and he did some computer calculations on the S's trans at 500 wtq for me. He told me that if I had a fairly low mileage "virgin" (no boost) trans and used either Redline MT-90 or Neo 75w90 RHD to help the shock on the gears, I should be able to get at least 80 hrs at near 500 wtq in 3rd gear and above (2nd is the weakest). Thats 80 hrs of beating on it at full tq load, not just putting around town and thats pretty darn good. Just putting around normally, the trans will last just as any other stock trans with the stock motor would.

Also, you wont be able to put anymore down than about 480-500 whp in second gear even with good hot DR's and dont even try to do anything with first gear. So, limit first and second gears to around 480 whp and then at the top of second and coming into third gear, start bringing in the boost to make the big power and the trans should hold for a while if you also follow what Jon from TRE stated on the gear oil.
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I'm currently making 741 whp and 471 wtq and we made about 15 pulls on the dynojet anywhere from 650 whp to 741 whp and didnt have one problem. I have also made about 20 or so pulls on the street at 741 whp with no problems and I get great traction with my DR's. Besides the rear skimming down the expressway in 4th and fifth gear at 120+ mph, which can make your butthole pucker pretty good.

I spoke to Jon at TRE a while back and he did some computer calculations on the S's trans at 500 wtq for me. He told me that if I had a fairly low mileage "virgin" (no boost) trans and used either Redline MT-90 or Neo 75w90 RHD to help the shock on the gears, I should be able to get at least 80 hrs at near 500 wtq in 3rd gear and above (2nd is the weakest). Thats 80 hrs of beating on it at full tq load, not just putting around town and thats pretty darn good. Just putting around normally, the trans will last just as any other stock trans with the stock motor would.

Also, you wont be able to put anymore down than about 480-500 whp in second gear even with good hot DR's and dont even try to do anything with first gear. So, limit first and second gears to around 480 whp and then at the top of second and coming into third gear, start bringing in the boost to make the big power and the trans should hold for a while if you also follow what Jon from TRE stated on the gear oil.
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Having your tires skimming a bit at full tilt is right where you want it to be. It means you are putting down the power to the ground and getting the car moving out hard without blowing the tires off. It means you are at the full amount of power to the ground at what the tires can handle without blowing them off. This is exactly how you want it and shows that you are right on the edge of what your DR's can handle on the street.

I believe Jon at TRE knows a lot more about figuring out what a trans can handle and for how long at a given whp than you, me or most anyone else here knows.

 

I'm currently making 741 whp and 471 wtq and we made about 15 pulls on the dynojet anywhere from 650 whp to 741 whp and didnt have one problem. I have also made about 20 or so pulls on the street at 741 whp with no problems and I get great traction with my DR's. Besides the rear skimming down the expressway in 4th and fifth gear at 120+ mph, which can make your butthole pucker pretty good.

I spoke to Jon at TRE a while back and he did some computer calculations on the S's trans at 500 wtq for me. He told me that if I had a fairly low mileage "virgin" (no boost) trans and used either Redline MT-90 or Neo 75w90 RHD to help the shock on the gears, I should be able to get at least 80 hrs at near 500 wtq in 3rd gear and above (2nd is the weakest). Thats 80 hrs of beating on it at full tq load, not just putting around town and thats pretty darn good. Just putting around normally, the trans will last just as any other stock trans with the stock motor would.

Also, you wont be able to put anymore down than about 480-500 whp in second gear even with good hot DR's and dont even try to do anything with first gear. So, limit first and second gears to around 480 whp and then at the top of second and coming into third gear, start bringing in the boost to make the big power and the trans should hold for a while if you also follow what Jon from TRE stated on the gear oil.
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[/quote]

Having your tires skimming a bit at full tilt is right where you want it to be. It means you are putting down the power to the ground and getting the car moving out hard without blowing the tires off. It means you are at the full amount of power to the ground at what the tires can handle without blowing them off. This is exactly how you want it and shows that you are right on the edge of what your DR's can handle on the street.

I believe Jon at TRE knows a lot more about figuring out what a trans can handle and for how long at a given whp than you, me or most anyone else here knows.
[/quote]
Is skimming a drag term? Like the drag radials are deflecting their shape? What is 'blowing the tires off'? I don't really understand the definition of your words, because the way i'm reading it is your saying the tires are spinning, ie they are losing traction.

In regards to Jon at TRE, it's alright if you want to believe him that your transmission will last 50 hours at 500 ft/lbs, but I'll continue to side with the countless people and data that has shown our transmissions to not last long at this level of torque.

 

^^Skimming is a term used for, at the edge of breaking loose without actually doing so. Meaning you're just holding that power to the ground and you can feel the tires are right on the edge of breaking loose, but they dont. Have you not ever watched an NHRA drag racing event and seen the rubber tracks they lay down as they go down the track? Thats skimming.......

On my original trans, it lasted 2 years and about 4000 miles at 440 wtq, 3 years at over 300 wtq and 2 years at over 200 wtq before 3rd gear finally gave up. Thats 12k miles boosted and I wasnt easy on it at all. I am living proof that the trans does last about the length of time Jon stated to me.

Also, Jon from TRE calculated 80 hrs at 500 wtq, not 50.

 

Spoolin is just one lucky guy.

He has a stock motor over 700whp+
Stock trans @ that power level
Stock Diff
Even a Lovefab GT1 that is coated and hasn't cracked.

Man can do no wrong, his car is a superstar.

 

he has the inline pro diff kit i believe, I'm realy worried about my tranny for my up coming build, I gotta get that par or ppg gearset asap