Drivetrain Transmission problems...

All t5 trans call for atf..your syncros are shot..I've seen gear oil destroy many t5 trans...expect the worst hope for the best on your rebuild

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Been there done that. My tranny had gear lube in it from the PO and when I switched to ATF it was all bad after that...

The tranny on my '86 gave out before I realized the PO had used gear oil in it. The smell was unmistakable when I swapped in a new one.

If you are not in a postition to replace the tranny and need to try something, you could drain the tranny really well and refill with Honda ATF. It is just a band-aid, but does work on worn synchros. I had a T56 that was using stock Dexron, and started grinding into gear, I heard about the Honda ATF trick, and did it. It stopped all the grinding so long as I wasn't powershifting. It ran like that for 30k miles when I owned it, and then the next owner never had issue with it for as long as I kept in touch. For all I know, it still might be on the original tranny right now.

Grinding doesn't just go away..it's a sign that syncros and internal parts are in their way out..u may b ok now but plan for the future.

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v8only said:

All t5 trans call for atf..your syncros are shot..I've seen gear oil destroy many t5 trans...expect the worst hope for the best on your rebuild

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Click to expand...

All NWC (non world class pre-85) T-5 use 70WT Gear Oil or Redline MTL.
ALL WC (world class after 1985) T-5 use ATF.
My transmission builder "Hanlon Motorsports" recommends NON synthetic after a rebuild. Why? Because the new fiber blocker rings need to grab a little to spin the next gear up to speed so it will mesh in quickly. A synthetic has too many slip additives and may cause a rake when shifting. On the other hand as ratio411 said, a slippery fluid like the Honda stuff may cause the gears to slide together without a grind if you have a T5 which has the OEM blocker rings.
As for the noise going away, after the Dextron got slung around good it may very well have gotten better. Keep us posted Cory.

Sure I've spoken with Bob Jacob.hanlon on many occasions ...learned off his t5 how to video and have been building t5s for over 5 years now..

I agree with the synthetic assessment...I always run regular atf too

I've always run atf even on the older units..there is actually some debate on atf vs gear oil on the nwc units..due to the brass bushings and syncros the nwc units seem to b able to take either fluid

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