The biggest hangup for me with experimenting with non-synchromesh fluids is that they don't make parts for this transmission. NOS synchronizers that sold for $185 not even 6 months ago are running $850 as stocks run out...and hopefully you don't damage a hard part as they are no longer made. Hopefully the aftermarket steps up and starts to build parts for the NV5600...
As for fluids:
I ran the OE fluid to 50k. It always shifted hard when cold, but was consistant.
Changed to Pennzoil (PZ) Synchromesh for 25k, it was almost identical to the OE fluid in performance...a little better when first filled, but it "wore in" after a little bit.
Decided to try Royal Purple (RP) Synchromax (At 75k total on truck). Changed to RP Synchromax and it was so bad within 500 miles that I dumped it for another fill of RP (all I had on hand).
Dumped that RP within another 500 miles (didn't go bad as quick as the first fill) for Redline (RL) MTL. It was much better than the RP and OE fluid.
Dumped the RL within 1000 miles as a "flush" and added Lucas transmission goo. (At around 78k miles on truck) This was a very nice shifting combination, but for a short while.
Dumped the RL/Lucas for another fill (at around 85k miles on truck). Overfilled by a quart as that was supposedly "better", I saw increased trans temps so I dumped the excess to "full" and things were back to normal.
At 95k (miles on truck), I added FastCoolers and switched to Amsoil MTF (the 5w30 stuff). Amsoil is by far the best performing oil to date, but at 108k, it is starting to decline in shift quality.
Both RL and Amsoil seem to start out really good, but fall off after a short while (around 10k). I would say they are pretty near equal...
As I explained in an early post, I know that LSD additive, LubeGuard, and Lucas have all been used (I am not sure of the oil). Both Lucas and LubeGuard were reported to have had a general, good early on performance that was short lived (under 5k miles).
RP did not give me good results, but I know others have had really good luck running it. Of all the oils, RP was the best shifting oil when I first filled with it, but I would expect to get more than 500 miles on a fill of oil...
I really want to get a used oil analysis on this fluid and see how it compares to the "standard" Amsoil has to see what might be happening in there. There has to be a solution.
steved
As for fluids:
I ran the OE fluid to 50k. It always shifted hard when cold, but was consistant.
Changed to Pennzoil (PZ) Synchromesh for 25k, it was almost identical to the OE fluid in performance...a little better when first filled, but it "wore in" after a little bit.
Decided to try Royal Purple (RP) Synchromax (At 75k total on truck). Changed to RP Synchromax and it was so bad within 500 miles that I dumped it for another fill of RP (all I had on hand).
Dumped that RP within another 500 miles (didn't go bad as quick as the first fill) for Redline (RL) MTL. It was much better than the RP and OE fluid.
Dumped the RL within 1000 miles as a "flush" and added Lucas transmission goo. (At around 78k miles on truck) This was a very nice shifting combination, but for a short while.
Dumped the RL/Lucas for another fill (at around 85k miles on truck). Overfilled by a quart as that was supposedly "better", I saw increased trans temps so I dumped the excess to "full" and things were back to normal.
At 95k (miles on truck), I added FastCoolers and switched to Amsoil MTF (the 5w30 stuff). Amsoil is by far the best performing oil to date, but at 108k, it is starting to decline in shift quality.
Both RL and Amsoil seem to start out really good, but fall off after a short while (around 10k). I would say they are pretty near equal...
As I explained in an early post, I know that LSD additive, LubeGuard, and Lucas have all been used (I am not sure of the oil). Both Lucas and LubeGuard were reported to have had a general, good early on performance that was short lived (under 5k miles).
RP did not give me good results, but I know others have had really good luck running it. Of all the oils, RP was the best shifting oil when I first filled with it, but I would expect to get more than 500 miles on a fill of oil...
I really want to get a used oil analysis on this fluid and see how it compares to the "standard" Amsoil has to see what might be happening in there. There has to be a solution.
steved
