2000 TJ manual transmission with bad 3rd gear synchromesh: Redline MTL or Royal Purple Synchromesh?

[davemorgan998]

I bought a 2000 TJ for my son to learn to drive in and learn about mechanics. So far so good but the manual transmission has a synchromesh issue going into 3rd gear. I can pull the transmission and get it rebuilt for $1800 but before I do that is there any benefit in trying new oil to see if it helps at all? I've read a lot about Redline MTL and Royal Purple Synchromesh, but what is the best for my situation? The TJ has 96 thousand miles on it and I have no idea when (or if) it was last changed.

 

[CreepinDeth]

Get a 2nd opinion

If its the same, just do the rebuild
Oil masking a problem is never a solution longterm

 

[AlanLGuy]

It won't hurt to change the transmission fluid, but it's not likely to help much either. Once syncros start going they'll just continue to get worse.

 

[RangerTJ]

I haven't personally used these guys, but I have them bookmarked for if/when my 3550 goes bye bye.

XP1 Transmission

Maybe someone on here has used them.

Also, at $1800 you're in the same price area as a brand new AX15.

 

[Jerry Bransford]

Redline MTL wouldn't be bad thing to try first. There's nothing better for the NV3550 or NSG370 transmissions.