Topic: 5 speed tranny issue

[shmedly]

 I've done some searching and got everything but what I need. I just lost the headgasket on the way to Moab. (no vacation in Moab, just the garage) finally got it running, got 35 miles on the new top end, and 2nd gear started to grind going into gear. Once in a while 4th will as-well, just not as bad. Now I have the tranny in 1st gear driving under a load, or steady driving in 1st runs ok, when I start to decelerate (in 1st) the tranny sounds like its going to EXPLODE!!! WTF!!! Does anyone have any suggestions? This really sucks! the tranny is supposed to have been rebuilt (with the motor) about 35k ago. It just started in a heartbeat, no warning at all. The clutch works good, and 3rd gear and 5th are good. (so far)...       

The truck is an 1985 4Runner with the 22RE and the stock 5 spd trans. I'm using Mobil one 75-90 syn (changed about 2 months ago)
 Thanks in advance for the help.. 

If someone knows a better place to ask this, please let me know! 

[RN37DD]

1st remove the shift lever and check your shifter seats. they may be chewed up or completely gone. i had a rebuilt tranny and they left the old ruined ones in when the rig came back to the owner. look at the little one at the end of the shifter too. I'd just run gl4 in it.. the syn might be to slick.. but then that just my idea on it.

[shmedly [OP]]

1st remove the shift lever and check your shifter seats. they may be chewed up or completely gone. i had a rebuilt tranny and they left the old ruined ones in when the rig came back to the owner. look at the little one at the end of the shifter too. I'd just run gl4 in it.. the syn might be to slick.. but then that just my idea on it.

The syn oil is to slick??? Can't say I've heard that one...I will take the shifter out and look. Thanks for the help..

[KDXSR5]

Synthetics can be too slick for the synchros to properly work in these trucks. Think about it; if the oil is really slick, the synchros will not work correctly, because they do need some friction to do their job. If the friction is removed do to the really slick oil, they synchros may not work properly and cause crappy shifting.